General cleanup and moved the reading of instruction parameters from a separate stage in execute to circuitry during the decode
This commit is contained in:
parent
af63ef1d68
commit
a693b87e96
348
system/decoder.v
348
system/decoder.v
@ -1,4 +1,4 @@
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/* decoder.v - Implementation of instruction opcode decoding logic
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/* decoder.v - Implementation of instruction decoding logic
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This file is part of the 9086 project.
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This file is part of the 9086 project.
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@ -23,56 +23,53 @@
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`include "error_header.v"
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`include "error_header.v"
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`include "config.v"
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`include "config.v"
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//TODO: rename CIR to OPCODE where applicable
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`define DE_STATE_BITS 2
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//TODO: check all includes
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`define DE_RESET 2'b00
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`define DE_STATE_ENTRY 2'b01
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`define DE_HALT 2'b10
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module decoder(
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module decoder(
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/* GENERAL */ input clock, input reset
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/* GENERAL */ input clock, input reset
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/* INPUT FROM IF */ ,input wire [31:0] IF2DE_INSTRUCTION,input wire VALID_INSTRUCTION, input [15:0] INSTRUCTION_LOCATION
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/* INPUT FROM IF */ ,input wire [31:0] IF2DE_INSTRUCTION,input wire VALID_INSTRUCTION, input [15:0] INSTRUCTION_LOCATION
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/* INPUT FROM EX */ ,input wire [7:0] EX2DE_FLAGS,input wire next_exec
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/* INPUT FROM EX */ ,input wire [7:0] EX2DE_FLAGS,input wire next_exec
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/* OUTPUT TO EX */ ,output reg [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT_sampled, output reg [23:0] DE2EX_INSTRUCTION
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/* OUTPUT TO EX */ ,output reg [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT_sampled
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/* */ ,output reg [15:0] ProgCount, output reg set_initial_values,output reg valid_exec_data
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/* */ ,output reg [15:0] ProgCount, output reg set_initial_values,output reg valid_exec_data
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/* OUTPUT TO IF */ ,output reg VALID_INSTRUCTION_ACK
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/* OUTPUT TO IF */ ,output reg VALID_INSTRUCTION_ACK
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`ifdef CALCULATE_IPC
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`ifdef CALCULATE_IPC
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/* STATISTICS */ ,output reg new_instruction
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/* STATISTICS */ ,output reg new_instruction
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`endif
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`endif
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`ifdef DEBUG_PC_ADDRESS
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/* DEBUG */ ,input FULL_INSTRUCTION
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`endif
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);
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);
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reg SIMPLE_MICRO; /* output simple decodings (=0) or microcode data (=1) */
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reg SIMPLE_MICRO; /* use simple decodings (=0) or microcode data (=1) */
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wire [`UCODE_ADDR_BITS-1:0] ucode_seq_addr_entry;
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wire [`UCODE_ADDR_BITS-1:0] ucode_seq_addr_entry;
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reg [`UCODE_ADDR_BITS-1:0] ucode_seq_addr;
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reg [`UCODE_ADDR_BITS-1:0] ucode_seq_addr;
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wire DEPENDS_ON_PREVIOUS;
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wire DEPENDS_ON_PREVIOUS;
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wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT;
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wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT;
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wire set_params;
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instruction_decode instruction_decode(
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instruction_decode instruction_decode(
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/* INPUT */ IF2DE_INSTRUCTION[31:16],{8'h0,EX2DE_FLAGS},
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/* INPUT */ IF2DE_INSTRUCTION,{8'h0,EX2DE_FLAGS},
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/* MICROCODE */ ucode_seq_addr_entry,SIMPLE_MICRO,ucode_seq_addr,
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/* MICROCODE */ ucode_seq_addr_entry,SIMPLE_MICRO,ucode_seq_addr,
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/* OUTPUT */ DE_OUTPUT,DEPENDS_ON_PREVIOUS
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/* OUTPUT */ DE_OUTPUT,DEPENDS_ON_PREVIOUS, set_params
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);
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);
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reg [`PROC_STATE_BITS-1:0] proc_state;
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reg [`DE_STATE_BITS-1:0] de_state;
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/*** RESET LOGIC ***/
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always @(negedge reset) begin
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always @(negedge reset) begin
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proc_state <= `PROC_HALT; //TODO: race condition ??
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de_state <= `DE_HALT; //TODO: race condition ??
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`ifdef CALCULATE_IPC
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`ifdef CALCULATE_IPC
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new_instruction<=0;
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new_instruction<=0;
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`endif
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`endif
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end
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end
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always @(posedge reset) begin
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always @(posedge reset) begin
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proc_state <= `PROC_RESET;
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de_state <= `DE_RESET;
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/* need early init */
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/* need early init */
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VALID_INSTRUCTION_ACK <= 0;
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VALID_INSTRUCTION_ACK <= 0;
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instant_response <= 0;
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instant_response <= 0;
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stalled_response <= 0;
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stalled_response <= 0;
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end
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end
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/*** Processor stages ***/
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wire [2:0] instr_end;
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wire [2:0] instr_end;
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InstrSize InstrSize({IF2DE_INSTRUCTION[31:24],IF2DE_INSTRUCTION[21:19]},instr_end);
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InstrSize InstrSize({IF2DE_INSTRUCTION[31:24],IF2DE_INSTRUCTION[21:19]},instr_end);
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@ -88,7 +85,7 @@ reg instant_response, stalled_response;
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reg wait_exec;
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reg wait_exec;
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always @(next_exec) begin
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always @(next_exec) begin
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proc_state<=`PROC_DE_STATE_ENTRY;
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de_state<=`DE_STATE_ENTRY;
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if ( VALID_INSTRUCTION_lc == 1 && DEPENDS_ON_PREVIOUS == 0 && ucode_seq_addr_entry==`UCODE_NO_INSTRUCTION) begin
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if ( VALID_INSTRUCTION_lc == 1 && DEPENDS_ON_PREVIOUS == 0 && ucode_seq_addr_entry==`UCODE_NO_INSTRUCTION) begin
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instant_response <= !instant_response;
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instant_response <= !instant_response;
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end else begin
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end else begin
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@ -96,30 +93,36 @@ always @(next_exec) begin
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end
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end
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end
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end
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reg first_ucode;
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always @(instant_response or stalled_response) begin
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always @(instant_response or stalled_response) begin
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DE_OUTPUT_sampled <= DE_OUTPUT;
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DE_OUTPUT_sampled <= DE_OUTPUT;
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if(SIMPLE_MICRO==0||owe_set_init==1)begin
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/* This runs at the start of the execution of an 8086 instruction */
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`ifdef DEBUG_PC_ADDRESS
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$display("Running command at %04x (%08x)",INSTRUCTION_LOCATION,FULL_INSTRUCTION);
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`endif
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`ifdef CALCULATE_IPC
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new_instruction <= !new_instruction;
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`endif
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VALID_INSTRUCTION_ACK <= !VALID_INSTRUCTION_ACK;
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owe_set_init<=0;
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set_initial_values <= !set_initial_values;
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ProgCount <= INSTRUCTION_LOCATION+{12'b0,instr_end};
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DE2EX_INSTRUCTION <= IF2DE_INSTRUCTION[23:0]; // First byte is never useful to execute
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end
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if ( (ucode_seq_addr==`UCODE_NO_INSTRUCTION) && (ucode_seq_addr_entry!=`UCODE_NO_INSTRUCTION) )begin
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if ( (ucode_seq_addr==`UCODE_NO_INSTRUCTION) && (ucode_seq_addr_entry!=`UCODE_NO_INSTRUCTION) )begin
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/* switch to microcode decoding */
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/* switch to microcode decoding */
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ucode_seq_addr <= ucode_seq_addr_entry;
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ucode_seq_addr <= ucode_seq_addr_entry;
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SIMPLE_MICRO <= 1;
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SIMPLE_MICRO <= 1;
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/*keep proc_state the same and rerun decode this time with all the data from the microcode rom*/
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first_ucode <= 1;
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set_initial_values <= !set_initial_values;
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/*keep de_state the same and rerun decode this time with all the data from the microcode rom*/
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end else begin
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end else begin
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if(SIMPLE_MICRO==0||first_ucode==1||owe_set_init==1)begin
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first_ucode <= 0;
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/* This runs at the start of the execution of an 8086 instruction */
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`ifdef DEBUG_PC_ADDRESS
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$display("Running command at %04x (%08x)",INSTRUCTION_LOCATION,IF2DE_INSTRUCTION);
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`endif
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`ifdef CALCULATE_IPC
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new_instruction <= !new_instruction;
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`endif
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owe_set_init<=0;
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ProgCount <= INSTRUCTION_LOCATION+{12'b0,instr_end};
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VALID_INSTRUCTION_ACK <= !VALID_INSTRUCTION_ACK;
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end
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if(set_params)begin
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set_initial_values <= !set_initial_values;
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end
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/* This runs at the start of each execution cycle, with microcode this is more than once per 8086 instruction */
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/* This runs at the start of each execution cycle, with microcode this is more than once per 8086 instruction */
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valid_exec_data<=!valid_exec_data;
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valid_exec_data<=!valid_exec_data;
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if( SIMPLE_MICRO == 1 ) begin
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if( SIMPLE_MICRO == 1 ) begin
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@ -134,23 +137,24 @@ always @(instant_response or stalled_response) begin
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end
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end
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always @(posedge clock) begin
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always @(posedge clock) begin
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case(proc_state)
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case(de_state)
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`PROC_RESET:begin
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`DE_RESET:begin
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ucode_seq_addr <= `UCODE_NO_INSTRUCTION;
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ucode_seq_addr <= `UCODE_NO_INSTRUCTION;
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DE_OUTPUT_sampled <= 0;
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DE_OUTPUT_sampled <= 0;
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SIMPLE_MICRO <= 0;
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SIMPLE_MICRO <= 0;
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proc_state <= `PROC_DE_STATE_ENTRY;
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de_state <= `DE_STATE_ENTRY;
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owe_set_init <= 0;
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owe_set_init <= 0;
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set_initial_values<=0;
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set_initial_values<=0;
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wait_exec<=0;
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wait_exec<=0;
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valid_exec_data<=0;
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valid_exec_data<=0;
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first_ucode <= 0;
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end
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end
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`PROC_DE_STATE_ENTRY:begin
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`DE_STATE_ENTRY:begin
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if ( ( VALID_INSTRUCTION==1 || SIMPLE_MICRO == 1 ) && wait_exec==0) begin
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if ( ( VALID_INSTRUCTION==1 || SIMPLE_MICRO == 1 ) && wait_exec==0) begin
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stalled_response <= !stalled_response;
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stalled_response <= !stalled_response;
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end
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end
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end
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end
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`PROC_HALT:begin
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`DE_HALT:begin
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end
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end
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default:begin
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default:begin
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end
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end
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@ -160,7 +164,7 @@ end
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endmodule
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endmodule
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/************************ Instruction specific decoding **********************************/
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module microcode(
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module microcode(
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@ -185,9 +189,9 @@ assign DATA=ucode_rom[ADDR];
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endmodule
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endmodule
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module instruction_decode(
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module instruction_decode(
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/* INPUTS */ input wire [15:0] CIR,input wire [15:0] FLAGS
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/* INPUTS */ input wire [31:0] INSTRUCTION,input wire [15:0] FLAGS
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/* MICROCODE */ ,output reg [`UCODE_ADDR_BITS-1:0] seq_addr_entry, input wire SIMPLE_MICRO, input wire [`UCODE_ADDR_BITS-1:0] seq_addr_input
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/* MICROCODE */ ,output reg [`UCODE_ADDR_BITS-1:0] seq_addr_entry, input wire SIMPLE_MICRO, input wire [`UCODE_ADDR_BITS-1:0] seq_addr_input
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/* OUTPUT */ ,output wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] OUTPUT, output reg DEPENDS_ON_PREVIOUS
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/* OUTPUT */ ,output wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] OUTPUT, output reg DEPENDS_ON_PREVIOUS, output reg set_params
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);
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);
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/* DEPENDS_ON_PREVIOUS - This encodes weather the instruction requires the previous to be finished in order to be decoded. This, for example, affects
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/* DEPENDS_ON_PREVIOUS - This encodes weather the instruction requires the previous to be finished in order to be decoded. This, for example, affects
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@ -260,18 +264,26 @@ microcode ucode(seq_addr_input,ucode_data);
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`define normal_instruction seq_addr_entry<=`UCODE_NO_INSTRUCTION;ERROR<=`ERR_NO_ERROR;HALT<=0;MEM_OR_IO=0;
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`define normal_instruction seq_addr_entry<=`UCODE_NO_INSTRUCTION;ERROR<=`ERR_NO_ERROR;HALT<=0;MEM_OR_IO=0;
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`define normal_microcoded ERROR<=`ERR_NO_ERROR;HALT<=0;MEM_OR_IO=0;
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`define normal_microcoded ERROR<=`ERR_NO_ERROR;HALT<=0;MEM_OR_IO=0;
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// I use blocking for basically putting names on the different fields of CIR and
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reg [1:0] PARAM_ACTION;
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`define NO_LOAD 2'b00
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`define LOAD_8 2'b01
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`define LOAD_16 2'b10
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// I use blocking for basically putting names on the different fields of INSTRUCTION and
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// then branching off of that instead of the raw bits. otherwise the code
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// then branching off of that instead of the raw bits. otherwise the code
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// would be identical
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// would be identical
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// verilator lint_off BLKSEQ
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// verilator lint_off BLKSEQ
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always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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always @( FLAGS or INSTRUCTION or SIMPLE_MICRO or seq_addr_input ) begin
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set_params = 1;
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PARAM_ACTION = `NO_LOAD;
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Sbit=0;//TODO: If no Sbit we assume it's 0,right?
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if (SIMPLE_MICRO==0)begin
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if (SIMPLE_MICRO==0)begin
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casez({CIR[15:8],CIR[5:3]})
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casez({INSTRUCTION[31:24],INSTRUCTION[21:19]})
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11'b0000_010?_??? : begin
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11'b0000_010?_??? : begin
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/* ADD - Add Immediate word/byte to accumulator */
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/* ADD - Add Immediate word/byte to accumulator */
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/* 0 0 0 0 0 1 0 W | DATA | DATA if W |*/
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/* 0 0 0 0 0 1 0 W | DATA | DATA if W |*/
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opcode_size=0;
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opcode_size=0;
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Wbit=CIR[8:8];
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Wbit=INSTRUCTION[24:24];
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IN_MOD=3'b011;
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IN_MOD=3'b011;
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in_alu_sel1=2'b00;
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in_alu_sel1=2'b00;
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in_alu_sel2=2'b01;
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in_alu_sel2=2'b01;
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@ -282,9 +294,9 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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ALU_OP=`ALU_OP_ADD;
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ALU_OP=`ALU_OP_ADD;
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memio_address_select=0;
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memio_address_select=0;
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if(Wbit)
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if(Wbit)
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next_state=`EXEC_DE_LOAD_16_PARAM;
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PARAM_ACTION=`LOAD_16;
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else
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else
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next_state=`EXEC_DE_LOAD_8_PARAM;
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PARAM_ACTION=`LOAD_8;
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DEPENDS_ON_PREVIOUS<=0;
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DEPENDS_ON_PREVIOUS<=0;
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`normal_instruction;
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`normal_instruction;
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end
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end
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@ -295,10 +307,10 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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/* SUB - Subtract immediate word/byte from register/memory */
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/* SUB - Subtract immediate word/byte from register/memory */
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/* 1 0 0 0 0 0 S W | MOD 1 0 1 R/M | < DISP LO > | < DISP HI > | DATA | DATA if W | */
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/* 1 0 0 0 0 0 S W | MOD 1 0 1 R/M | < DISP LO > | < DISP HI > | DATA | DATA if W | */
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opcode_size=1;
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opcode_size=1;
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Wbit=CIR[8:8];
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Wbit=INSTRUCTION[24:24];
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Sbit=CIR[9:9];
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Sbit=INSTRUCTION[25:25];
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IN_MOD={1'b0,CIR[7:6]};
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IN_MOD={1'b0,INSTRUCTION[23:22]};
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RM=CIR[2:0];
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RM=INSTRUCTION[18:16];
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in_alu_sel1=2'b00;
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in_alu_sel1=2'b00;
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if(IN_MOD==3'b011)begin
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if(IN_MOD==3'b011)begin
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in_alu_sel2=2'b01;
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in_alu_sel2=2'b01;
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@ -310,18 +322,18 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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OUT_MOD=IN_MOD;
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OUT_MOD=IN_MOD;
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MEM_OR_IO=0;
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MEM_OR_IO=0;
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memio_address_select=0;
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memio_address_select=0;
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case({Sbit,Wbit})
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case({Sbit,Wbit}) // TODO: Isn't this supposed to be just a LOAD_8?
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2'b00,2'b11:begin
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2'b00,2'b11:begin
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next_state=`EXEC_DE_LOAD_8_PARAM;
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PARAM_ACTION=`LOAD_8;
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end
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end
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2'b01:begin
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2'b01:begin
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next_state=`EXEC_DE_LOAD_16_PARAM;
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PARAM_ACTION=`LOAD_16;
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end
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end
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default:begin
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default:begin
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`invalid_instruction
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`invalid_instruction
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end
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end
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endcase
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endcase
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case(CIR[5:3])
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case(INSTRUCTION[21:19])
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3'b000: ALU_OP=`ALU_OP_ADD;
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3'b000: ALU_OP=`ALU_OP_ADD;
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3'b101: ALU_OP=`ALU_OP_SUB_REVERSE;
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3'b101: ALU_OP=`ALU_OP_SUB_REVERSE;
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default:begin
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default:begin
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@ -336,10 +348,10 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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/* CMP - compare Immediate with register / memory */
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/* CMP - compare Immediate with register / memory */
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/* 1 0 0 0 0 0 S W | MOD 1 1 1 R/M | < DISP LO > | < DISP HI > | DATA | DATA if W | */
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/* 1 0 0 0 0 0 S W | MOD 1 1 1 R/M | < DISP LO > | < DISP HI > | DATA | DATA if W | */
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opcode_size=1;
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opcode_size=1;
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Wbit=CIR[8:8];
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Wbit=INSTRUCTION[24:24];
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Sbit=CIR[9:9];
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Sbit=INSTRUCTION[25:25];
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IN_MOD={1'b0,CIR[7:6]};
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IN_MOD={1'b0,INSTRUCTION[23:22]};
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RM=CIR[2:0];
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RM=INSTRUCTION[18:16];
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if ( {Sbit,Wbit} == 2'b10 )begin
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if ( {Sbit,Wbit} == 2'b10 )begin
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`invalid_instruction
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`invalid_instruction
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end
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end
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@ -352,31 +364,36 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
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/*compare register with param*/
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/*compare register with param*/
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in_alu_sel2=2'b01;
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in_alu_sel2=2'b01;
|
||||||
reg_read_port2_addr={Wbit,RM};
|
reg_read_port2_addr={Wbit,RM};
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end else begin
|
end else begin
|
||||||
/*compare register indirect access
|
/*compare register indirect access
|
||||||
* with param */
|
* with param */
|
||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
|
next_state=`EXEC_MEMIO_READ;
|
||||||
/*will call MEMIO_READ after EXEC_DE_LOAD..*/
|
/*will call MEMIO_READ after EXEC_DE_LOAD..*/
|
||||||
end
|
end
|
||||||
if(Wbit)
|
if(Wbit)
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
else
|
else
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
`normal_instruction;
|
`normal_instruction;
|
||||||
end
|
end
|
||||||
11'b1011_0???_??? : begin
|
11'b1011_????_??? : begin
|
||||||
/* MOV - Move Immediate byte to register */
|
/* MOV - Move Immediate byte to register */
|
||||||
/* 1 0 1 1 W REG | DATA | DATA if W |*/
|
/* 1 0 1 1 W REG | DATA | DATA if W |*/
|
||||||
Wbit=CIR[11:11]; /* IS 0 */
|
Wbit=INSTRUCTION[27:27]; /* IS 0 */
|
||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
in_alu_sel1=2'b00;
|
in_alu_sel1=2'b00;
|
||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
OUT_MOD=3'b011;
|
OUT_MOD=3'b011;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
reg_write_addr={1'b0,CIR[10:8]};
|
reg_write_addr={Wbit,INSTRUCTION[26:24]};
|
||||||
PARAM1[7:0]=CIR[7:0];
|
if(Wbit)
|
||||||
|
PARAM_ACTION=`LOAD_16;
|
||||||
|
else
|
||||||
|
PARAM_ACTION=`LOAD_8;
|
||||||
PARAM2=0;
|
PARAM2=0;
|
||||||
ALU_OP=`ALU_OP_ADD;
|
ALU_OP=`ALU_OP_ADD;
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -384,35 +401,18 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
memio_address_select=0;
|
memio_address_select=0;
|
||||||
end
|
end
|
||||||
11'b1011_1???_??? : begin
|
|
||||||
/*MOV - Move Immediate word to register*/
|
|
||||||
Wbit=CIR[11:11]; /*IS 1 */
|
|
||||||
opcode_size=0;
|
|
||||||
IN_MOD=3'b011;
|
|
||||||
in_alu_sel1=2'b00;
|
|
||||||
in_alu_sel2=2'b00;
|
|
||||||
OUT_MOD=3'b011;
|
|
||||||
MEM_OR_IO=0;
|
|
||||||
reg_write_addr={1'b1,CIR[10:8]};
|
|
||||||
ALU_OP=`ALU_OP_ADD;
|
|
||||||
PARAM2=0;
|
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
|
||||||
`normal_instruction;
|
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
|
||||||
memio_address_select=0;
|
|
||||||
end
|
|
||||||
11'b1000_10??_??? : begin
|
11'b1000_10??_??? : begin
|
||||||
/* MOV - Reg/Mem to/from register */
|
/* MOV - Reg/Mem to/from register */
|
||||||
/* 1 0 0 0 1 0 D W | MOD REG RM | < DISP LO > | < DISP HI > |*/
|
/* 1 0 0 0 1 0 D W | MOD REG RM | < DISP LO > | < DISP HI > |*/
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
RM=CIR[2:0];
|
RM=INSTRUCTION[18:16];
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
in_alu_sel1=2'b00;
|
in_alu_sel1=2'b00;
|
||||||
PARAM1=0;
|
PARAM1=0;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(CIR[9:9] == 1)begin
|
if(INSTRUCTION[25:25] == 1)begin
|
||||||
/* Mem/Reg to reg */
|
/* Mem/Reg to reg */
|
||||||
IN_MOD={1'b0,CIR[7:6]};
|
IN_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
if(IN_MOD==3'b011)begin
|
if(IN_MOD==3'b011)begin
|
||||||
/*Reg to Reg*/
|
/*Reg to Reg*/
|
||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
@ -424,11 +424,11 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
next_state=`EXEC_MEMIO_READ;
|
next_state=`EXEC_MEMIO_READ;
|
||||||
end
|
end
|
||||||
OUT_MOD=3'b011;
|
OUT_MOD=3'b011;
|
||||||
reg_write_addr={Wbit,CIR[5:3]};
|
reg_write_addr={Wbit,INSTRUCTION[21:19]};
|
||||||
end else begin
|
end else begin
|
||||||
/* Reg to Mem/Reg */
|
/* Reg to Mem/Reg */
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
OUT_MOD={1'b0,CIR[7:6]};
|
OUT_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
if(IN_MOD==3'b011)begin
|
if(IN_MOD==3'b011)begin
|
||||||
/*Reg to Reg*/
|
/*Reg to Reg*/
|
||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
@ -439,7 +439,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
next_state=`EXEC_DE_LOAD_REG_TO_PARAM;
|
next_state=`EXEC_DE_LOAD_REG_TO_PARAM;
|
||||||
end
|
end
|
||||||
reg_read_port2_addr={Wbit,CIR[5:3]};
|
reg_read_port2_addr={Wbit,INSTRUCTION[21:19]};
|
||||||
end
|
end
|
||||||
ALU_OP=`ALU_OP_ADD;
|
ALU_OP=`ALU_OP_ADD;
|
||||||
|
|
||||||
@ -460,9 +460,9 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
PARAM2=1;
|
PARAM2=1;
|
||||||
reg_read_port1_addr={1'b1,CIR[10:8]};
|
reg_read_port1_addr={1'b1,INSTRUCTION[26:24]};
|
||||||
reg_write_addr={1'b1,CIR[10:8]};
|
reg_write_addr={1'b1,INSTRUCTION[26:24]};
|
||||||
if(CIR[11:11]==0)
|
if(INSTRUCTION[27:27]==0)
|
||||||
ALU_OP=`ALU_OP_ADD;
|
ALU_OP=`ALU_OP_ADD;
|
||||||
else
|
else
|
||||||
ALU_OP=`ALU_OP_SUB;
|
ALU_OP=`ALU_OP_SUB;
|
||||||
@ -477,9 +477,9 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* DEC - Register/Memory */
|
/* DEC - Register/Memory */
|
||||||
/* 1 1 1 1 1 1 1 W | MOD 0 0 1 R/M | < DISP LO> | < DISP HI> */
|
/* 1 1 1 1 1 1 1 W | MOD 0 0 1 R/M | < DISP LO> | < DISP HI> */
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
IN_MOD={1'b0,CIR[7:6]};
|
IN_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
RM=CIR[2:0];
|
RM=INSTRUCTION[18:16];
|
||||||
in_alu_sel2=(IN_MOD==3'b011)? 2'b01 : 2'b00;
|
in_alu_sel2=(IN_MOD==3'b011)? 2'b01 : 2'b00;
|
||||||
in_alu_sel1=2'b00;/* number 1 */
|
in_alu_sel1=2'b00;/* number 1 */
|
||||||
PARAM1=1;
|
PARAM1=1;
|
||||||
@ -490,7 +490,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
reg_read_port2_addr={1'b0,RM};
|
reg_read_port2_addr={1'b0,RM};
|
||||||
reg_write_addr={1'b0,RM};
|
reg_write_addr={1'b0,RM};
|
||||||
|
|
||||||
ALU_OP=(CIR[3:3]==1)?`ALU_OP_SUB_REVERSE:`ALU_OP_ADD;
|
ALU_OP=(INSTRUCTION[19:19]==1)?`ALU_OP_SUB_REVERSE:`ALU_OP_ADD;
|
||||||
if ( IN_MOD == 3'b011 )
|
if ( IN_MOD == 3'b011 )
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
else
|
else
|
||||||
@ -518,7 +518,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* */
|
/* */
|
||||||
/* NOTE: 8086 doc doesn't show the third byte but the */
|
/* NOTE: 8086 doc doesn't show the third byte but the */
|
||||||
/* W flag and my assembler seem to disagree */
|
/* W flag and my assembler seem to disagree */
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
in_alu_sel1=2'b00;
|
in_alu_sel1=2'b00;
|
||||||
@ -528,11 +528,12 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
ALU_OP=`ALU_OP_SUB_REVERSE;
|
ALU_OP=`ALU_OP_SUB_REVERSE;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(Wbit==1)
|
if(Wbit==1)
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
else begin
|
else begin
|
||||||
PARAM1[7:0]=CIR[7:0];
|
PARAM_ACTION=`LOAD_8;
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
//PARAM1[7:0]=INSTRUCTION[7:0]; TODO:needed?
|
||||||
end
|
end
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
`normal_instruction;
|
`normal_instruction;
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
memio_address_select=0;
|
memio_address_select=0;
|
||||||
@ -550,14 +551,14 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
in_alu_sel1=2'b10;
|
in_alu_sel1=2'b10;
|
||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
PARAM2={{8{CIR[7:7]}},CIR[7:0]};
|
PARAM2={{8{INSTRUCTION[23:23]}},INSTRUCTION[23:16]};
|
||||||
ALU_OP=`ALU_OP_ADD_SIGNED_B;
|
ALU_OP=`ALU_OP_ADD_SIGNED_B;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
OUT_MOD=3'b101;
|
OUT_MOD=3'b101;
|
||||||
case(CIR[11:9])
|
case(INSTRUCTION[27:25])
|
||||||
3'b000: begin
|
3'b000: begin
|
||||||
/* Jump on (not) Overflow */
|
/* Jump on (not) Overflow */
|
||||||
if(FLAGS[11:11]==CIR[8:8])
|
if(FLAGS[11:11]==INSTRUCTION[24:24])
|
||||||
next_state=`EXEC_NEXT_INSTRUCTION;
|
next_state=`EXEC_NEXT_INSTRUCTION;
|
||||||
else begin
|
else begin
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -566,7 +567,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
end
|
end
|
||||||
3'b010: begin
|
3'b010: begin
|
||||||
/* Jump on (not) Zero */
|
/* Jump on (not) Zero */
|
||||||
if(FLAGS[6:6]==CIR[8:8])
|
if(FLAGS[6:6]==INSTRUCTION[24:24])
|
||||||
next_state=`EXEC_NEXT_INSTRUCTION;
|
next_state=`EXEC_NEXT_INSTRUCTION;
|
||||||
else
|
else
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -574,7 +575,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
end
|
end
|
||||||
3'b100: begin
|
3'b100: begin
|
||||||
/* Jump on (not) Sign */
|
/* Jump on (not) Sign */
|
||||||
if(FLAGS[7:7]==CIR[8:8])
|
if(FLAGS[7:7]==INSTRUCTION[24:24])
|
||||||
next_state=`EXEC_NEXT_INSTRUCTION;
|
next_state=`EXEC_NEXT_INSTRUCTION;
|
||||||
else
|
else
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -582,7 +583,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
end
|
end
|
||||||
3'b101: begin
|
3'b101: begin
|
||||||
/* Jump on (not) Parity */
|
/* Jump on (not) Parity */
|
||||||
if(FLAGS[2:2]==CIR[8:8])
|
if(FLAGS[2:2]==INSTRUCTION[24:24])
|
||||||
next_state=`EXEC_NEXT_INSTRUCTION;
|
next_state=`EXEC_NEXT_INSTRUCTION;
|
||||||
else
|
else
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -590,7 +591,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
end
|
end
|
||||||
3'b001: begin
|
3'b001: begin
|
||||||
/* Jump on (not) Carry */
|
/* Jump on (not) Carry */
|
||||||
if(FLAGS[0:0]==CIR[8:8])
|
if(FLAGS[0:0]==INSTRUCTION[24:24])
|
||||||
next_state=`EXEC_NEXT_INSTRUCTION;
|
next_state=`EXEC_NEXT_INSTRUCTION;
|
||||||
else
|
else
|
||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
@ -610,7 +611,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
Wbit=1;
|
Wbit=1;
|
||||||
in_alu_sel1=2'b10;
|
in_alu_sel1=2'b10;
|
||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
PARAM2={{8{CIR[7:7]}},CIR[7:0]};
|
PARAM2={{8{INSTRUCTION[23:23]}},INSTRUCTION[23:16]};
|
||||||
ALU_OP=`ALU_OP_ADD_SIGNED_B;
|
ALU_OP=`ALU_OP_ADD_SIGNED_B;
|
||||||
OUT_MOD=3'b101;
|
OUT_MOD=3'b101;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
@ -651,7 +652,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* STOS - Write byte/word to [DI] and increment accordingly */
|
/* STOS - Write byte/word to [DI] and increment accordingly */
|
||||||
/* | 1 0 1 0 1 0 1 W | */
|
/* | 1 0 1 0 1 0 1 W | */
|
||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
Sbit=0;
|
Sbit=0;
|
||||||
RM=3'b101;
|
RM=3'b101;
|
||||||
seq_addr_entry<=`UCODE_STOS_ENTRY;
|
seq_addr_entry<=`UCODE_STOS_ENTRY;
|
||||||
@ -667,7 +668,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
Wbit=1;
|
Wbit=1;
|
||||||
Sbit=0;
|
Sbit=0;
|
||||||
PARAM2=2;
|
PARAM2=2;
|
||||||
reg_read_port2_addr={1'b1,CIR[10:8]};
|
reg_read_port2_addr={1'b1,INSTRUCTION[26:24]};
|
||||||
seq_addr_entry<=`UCODE_PUSH_ENTRY;
|
seq_addr_entry<=`UCODE_PUSH_ENTRY;
|
||||||
`normal_microcoded
|
`normal_microcoded
|
||||||
memio_address_select=0;
|
memio_address_select=0;
|
||||||
@ -677,14 +678,14 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* TEST - Bitwise AND of immediate and registers/memory affecting only flags */
|
/* TEST - Bitwise AND of immediate and registers/memory affecting only flags */
|
||||||
/* 1 1 1 1 0 1 1 W | MOD 0 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
/* 1 1 1 1 0 1 1 W | MOD 0 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
IN_MOD={1'b0,CIR[7:6]};
|
IN_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
RM={CIR[2:0]};
|
RM={INSTRUCTION[18:16]};
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(Wbit==1)begin
|
if(Wbit==1)begin
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
end else begin
|
end else begin
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
end
|
end
|
||||||
in_alu_sel1=2'b00; /* PARAM1 */
|
in_alu_sel1=2'b00; /* PARAM1 */
|
||||||
ALU_OP=`ALU_OP_AND;
|
ALU_OP=`ALU_OP_AND;
|
||||||
@ -692,9 +693,11 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
3'b011:begin
|
3'b011:begin
|
||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
reg_read_port2_addr={Wbit,RM};
|
reg_read_port2_addr={Wbit,RM};
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end
|
end
|
||||||
default:begin
|
default:begin
|
||||||
`invalid_instruction
|
`invalid_instruction
|
||||||
|
next_state=`EXEC_MEMIO_READ;
|
||||||
end
|
end
|
||||||
endcase
|
endcase
|
||||||
OUT_MOD=3'b100;/*NULL*/
|
OUT_MOD=3'b100;/*NULL*/
|
||||||
@ -706,15 +709,16 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* TEST - Bitwise AND of immediate and accumulator affecting only flags */
|
/* TEST - Bitwise AND of immediate and accumulator affecting only flags */
|
||||||
/* 1 0 1 0 1 0 0 W | DATA | DATA if W | */
|
/* 1 0 1 0 1 0 0 W | DATA | DATA if W | */
|
||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
RM=3'b000;
|
RM=3'b000;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(Wbit==1)begin
|
if(Wbit==1)begin
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
end else begin
|
end else begin
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
end
|
end
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
in_alu_sel1=2'b00; /* PARAM1 */
|
in_alu_sel1=2'b00; /* PARAM1 */
|
||||||
ALU_OP=`ALU_OP_AND;
|
ALU_OP=`ALU_OP_AND;
|
||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
@ -731,7 +735,7 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
Wbit=1;
|
Wbit=1;
|
||||||
Sbit=0;
|
Sbit=0;
|
||||||
PARAM1=2;
|
PARAM1=2;
|
||||||
reg_write_addr={1'b1,CIR[10:8]};
|
reg_write_addr={1'b1,INSTRUCTION[26:24]};
|
||||||
seq_addr_entry<=`UCODE_POP_ENTRY;
|
seq_addr_entry<=`UCODE_POP_ENTRY;
|
||||||
`normal_microcoded
|
`normal_microcoded
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
@ -742,8 +746,8 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* 1 1 1 1 1 1 1 1 | MOD 1 0 0 R/M | < DISP-LO > | < DISP-HI > */
|
/* 1 1 1 1 1 1 1 1 | MOD 1 0 0 R/M | < DISP-LO > | < DISP-HI > */
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
Wbit=1;
|
Wbit=1;
|
||||||
IN_MOD={1'b0,CIR[7:6]};
|
IN_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
RM=CIR[2:0];
|
RM=INSTRUCTION[18:16];
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
in_alu_sel1=2'b11;
|
in_alu_sel1=2'b11;
|
||||||
if (IN_MOD==3'b011)begin
|
if (IN_MOD==3'b011)begin
|
||||||
@ -763,23 +767,24 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
11'b1100_011?_000:begin
|
11'b1100_011?_000:begin
|
||||||
/* MOV - Move immediate to register/memory */
|
/* MOV - Move immediate to register/memory */
|
||||||
/* 1 1 0 0 0 1 1 W | MOD 0 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
/* 1 1 0 0 0 1 1 W | MOD 0 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
in_alu_sel1=2'b00;
|
in_alu_sel1=2'b00;
|
||||||
in_alu_sel2=2'b11;
|
in_alu_sel2=2'b11;
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(Wbit==1)begin
|
if(Wbit==1)begin
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
end else begin
|
end else begin
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
end
|
end
|
||||||
|
|
||||||
OUT_MOD={1'b0,CIR[7:6]};
|
OUT_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
RM=CIR[2:0];
|
RM=INSTRUCTION[18:16];
|
||||||
`normal_instruction;
|
`normal_instruction;
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
memio_address_select=0;
|
memio_address_select=0;
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end
|
end
|
||||||
11'b1100_1101_???:begin
|
11'b1100_1101_???:begin
|
||||||
/* INT - Execute interrupt handler */
|
/* INT - Execute interrupt handler */
|
||||||
@ -803,18 +808,19 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* OUT - Write AL or AX to a defined output port */
|
/* OUT - Write AL or AX to a defined output port */
|
||||||
/* | 1 1 1 0 0 1 1 W | DATA 8 | */
|
/* | 1 1 1 0 0 1 1 W | DATA 8 | */
|
||||||
memio_address_select=1;
|
memio_address_select=1;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
opcode_size=0;
|
opcode_size=0;
|
||||||
in_alu_sel1=2'b00;
|
in_alu_sel1=2'b00;
|
||||||
in_alu_sel2=2'b11;
|
in_alu_sel2=2'b11;
|
||||||
reg_read_port1_addr={Wbit,3'b000};
|
reg_read_port1_addr={Wbit,3'b000};
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
MEM_OR_IO=1;
|
MEM_OR_IO=1;
|
||||||
HALT <= 0;
|
HALT <= 0;
|
||||||
PARAM1=0;
|
PARAM1=0;
|
||||||
OUT_MOD={3'b000};
|
OUT_MOD={3'b000};
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end
|
end
|
||||||
11'b1100_1111_???:begin
|
11'b1100_1111_???:begin
|
||||||
/* IRET - Return from interrupt */
|
/* IRET - Return from interrupt */
|
||||||
@ -836,17 +842,17 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* AND - Bitwise AND immediate and register/mem */
|
/* AND - Bitwise AND immediate and register/mem */
|
||||||
/* 1 0 0 0 0 0 0 W | MOD 1 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
/* 1 0 0 0 0 0 0 W | MOD 1 0 0 R/M | < DISP-LO > | < DISP-HI > | DATA | DATA if W */
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
IN_MOD={1'b0,CIR[7:6]};
|
IN_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
RM={CIR[2:0]};
|
RM={INSTRUCTION[18:16]};
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
if(Wbit==1)begin
|
if(Wbit==1)begin
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
end else begin
|
end else begin
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
end
|
end
|
||||||
in_alu_sel1=2'b00; /* PARAM1 */
|
in_alu_sel1=2'b00; /* PARAM1 */
|
||||||
case(CIR[5:3])
|
case(INSTRUCTION[21:19])
|
||||||
3'b100: ALU_OP=`ALU_OP_AND;
|
3'b100: ALU_OP=`ALU_OP_AND;
|
||||||
3'b001: ALU_OP=`ALU_OP_OR;
|
3'b001: ALU_OP=`ALU_OP_OR;
|
||||||
default:begin end
|
default:begin end
|
||||||
@ -856,9 +862,11 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
reg_read_port2_addr={Wbit,RM};
|
reg_read_port2_addr={Wbit,RM};
|
||||||
reg_write_addr={Wbit,RM};
|
reg_write_addr={Wbit,RM};
|
||||||
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end
|
end
|
||||||
default:begin
|
default:begin
|
||||||
`unimpl_addressing_mode
|
`unimpl_addressing_mode
|
||||||
|
next_state=`EXEC_MEMIO_READ;
|
||||||
end
|
end
|
||||||
endcase
|
endcase
|
||||||
OUT_MOD=IN_MOD;
|
OUT_MOD=IN_MOD;
|
||||||
@ -874,12 +882,12 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
/* ADD - Reg/memory with register to either */
|
/* ADD - Reg/memory with register to either */
|
||||||
/* 0 0 0 0 0 0 D W | MOD REG R/M | < DISP LO > | < DISP HI > | */
|
/* 0 0 0 0 0 0 D W | MOD REG R/M | < DISP LO > | < DISP HI > | */
|
||||||
opcode_size=1;
|
opcode_size=1;
|
||||||
Wbit=CIR[8:8];
|
Wbit=INSTRUCTION[24:24];
|
||||||
Sbit=0;
|
Sbit=0;
|
||||||
IN_MOD=3'b011;
|
IN_MOD=3'b011;
|
||||||
RM=CIR[2:0];
|
RM=INSTRUCTION[18:16];
|
||||||
in_alu_sel1=2'b01;//constantly register
|
in_alu_sel1=2'b01;//constantly register
|
||||||
reg_read_port1_addr={Wbit,CIR[5:3]};
|
reg_read_port1_addr={Wbit,INSTRUCTION[21:19]};
|
||||||
if(IN_MOD==3'b011)begin
|
if(IN_MOD==3'b011)begin
|
||||||
in_alu_sel2=2'b01;
|
in_alu_sel2=2'b01;
|
||||||
reg_read_port2_addr={Wbit,RM};
|
reg_read_port2_addr={Wbit,RM};
|
||||||
@ -887,27 +895,29 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
next_state=`EXEC_WRITE_ENTRY;
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
end else begin
|
end else begin
|
||||||
in_alu_sel2=2'b00;
|
in_alu_sel2=2'b00;
|
||||||
if(Wbit)
|
if(Wbit==1)begin
|
||||||
next_state=`EXEC_DE_LOAD_16_PARAM;
|
PARAM_ACTION=`LOAD_16;
|
||||||
else
|
end else begin
|
||||||
next_state=`EXEC_DE_LOAD_8_PARAM;
|
PARAM_ACTION=`LOAD_8;
|
||||||
|
end
|
||||||
end
|
end
|
||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
memio_address_select=0;
|
memio_address_select=0;
|
||||||
case (CIR[13:10])
|
case (INSTRUCTION[29:26])
|
||||||
4'b0000: ALU_OP=`ALU_OP_ADD;
|
4'b0000: ALU_OP=`ALU_OP_ADD;
|
||||||
4'b1010: ALU_OP=`ALU_OP_SUB;
|
4'b1010: ALU_OP=`ALU_OP_SUB;
|
||||||
4'b1110: ALU_OP=`ALU_OP_SUB_REVERSE;
|
4'b1110: ALU_OP=`ALU_OP_SUB_REVERSE;
|
||||||
default: begin end
|
default: begin end
|
||||||
endcase
|
endcase
|
||||||
case (CIR[13:10])
|
case (INSTRUCTION[29:26])
|
||||||
4'b0000: OUT_MOD={1'b0,CIR[7:6]};
|
4'b0000: OUT_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
4'b1010: OUT_MOD={1'b0,CIR[7:6]};
|
4'b1010: OUT_MOD={1'b0,INSTRUCTION[23:22]};
|
||||||
4'b1110: OUT_MOD=3'b100; /* NULL */
|
4'b1110: OUT_MOD=3'b100; /* NULL */
|
||||||
default: begin end
|
default: begin end
|
||||||
endcase
|
endcase
|
||||||
DEPENDS_ON_PREVIOUS<=0;
|
DEPENDS_ON_PREVIOUS<=0;
|
||||||
if(CIR[9:9]==1'b0) begin
|
next_state=`EXEC_WRITE_ENTRY;
|
||||||
|
if(INSTRUCTION[25:25]==1'b0) begin
|
||||||
`normal_instruction;
|
`normal_instruction;
|
||||||
end else begin
|
end else begin
|
||||||
`unimpl_addressing_mode;
|
`unimpl_addressing_mode;
|
||||||
@ -923,11 +933,11 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
//from when we ordered the switch to microcode
|
//from when we ordered the switch to microcode
|
||||||
seq_addr_entry <= ucode_data[`UCODE_ADDR_BITS-1:0];
|
seq_addr_entry <= ucode_data[`UCODE_ADDR_BITS-1:0];
|
||||||
case(ucode_data[8:6])
|
case(ucode_data[8:6])
|
||||||
3'b000: next_state=`EXEC_WRITE_ENTRY;
|
3'b000: begin next_state=`EXEC_WRITE_ENTRY; set_params = 0; end
|
||||||
3'b001: next_state=`EXEC_DE_LOAD_16_PARAM;
|
3'b001: begin next_state=`EXEC_WRITE_ENTRY; PARAM_ACTION=`LOAD_16;end
|
||||||
3'b010: next_state=`EXEC_DE_LOAD_8_PARAM;
|
3'b010: begin next_state=`EXEC_WRITE_ENTRY; PARAM_ACTION=`LOAD_8;end
|
||||||
3'b011: next_state=`EXEC_MEMIO_READ;
|
3'b011: begin next_state=`EXEC_MEMIO_READ;set_params = 0; end
|
||||||
3'b100: next_state=`EXEC_MEMIO_READ_SETADDR;
|
3'b100: begin next_state=`EXEC_MEMIO_READ_SETADDR;set_params = 0; end
|
||||||
default: begin end /*impossible*/
|
default: begin end /*impossible*/
|
||||||
endcase
|
endcase
|
||||||
if(ucode_data[36:36]==0) /*Set reg write address*/
|
if(ucode_data[36:36]==0) /*Set reg write address*/
|
||||||
@ -959,6 +969,42 @@ always @( FLAGS or CIR or SIMPLE_MICRO or seq_addr_input ) begin
|
|||||||
MEM_OR_IO=0;
|
MEM_OR_IO=0;
|
||||||
HALT <= 0;
|
HALT <= 0;
|
||||||
end
|
end
|
||||||
|
|
||||||
|
if(PARAM_ACTION==`LOAD_8)begin
|
||||||
|
if(opcode_size==0)begin
|
||||||
|
if({Sbit,Wbit}==2'b11)begin
|
||||||
|
/*signed "16bit" read*/
|
||||||
|
PARAM1 = {{8{INSTRUCTION[23:23]}},INSTRUCTION[23:16]};
|
||||||
|
end else begin
|
||||||
|
//PARAM1[7:0] = INSTRUCTION[23:16];
|
||||||
|
PARAM1 = {8'b0,INSTRUCTION[23:16]};
|
||||||
|
end
|
||||||
|
end else begin
|
||||||
|
if({Sbit,Wbit}==2'b11)begin
|
||||||
|
/*signed "16bit" read*/
|
||||||
|
PARAM1 = {{8{INSTRUCTION[15:15]}},INSTRUCTION[15:8]};
|
||||||
|
end else begin
|
||||||
|
//PARAM1[7:0] = INSTRUCTION[15:8];
|
||||||
|
PARAM1 = {8'b0,INSTRUCTION[15:8]};
|
||||||
|
end
|
||||||
|
end
|
||||||
|
case(IN_MOD)
|
||||||
|
3'b000,3'b001,3'b010: next_state = `EXEC_MEMIO_READ;
|
||||||
|
default: next_state = `EXEC_WRITE_ENTRY;
|
||||||
|
endcase
|
||||||
|
end else if (PARAM_ACTION == `LOAD_16) begin
|
||||||
|
if(opcode_size==0)begin
|
||||||
|
PARAM1[7:0] = INSTRUCTION[23:16];
|
||||||
|
PARAM1[15:8] = INSTRUCTION[15:8];
|
||||||
|
end else begin
|
||||||
|
PARAM1[15:8] = INSTRUCTION[7:0];
|
||||||
|
PARAM1[7:0] = INSTRUCTION[15:8];
|
||||||
|
end
|
||||||
|
case(IN_MOD)
|
||||||
|
3'b000,3'b001,3'b010: next_state = `EXEC_MEMIO_READ;
|
||||||
|
default: next_state = `EXEC_WRITE_ENTRY;
|
||||||
|
endcase
|
||||||
|
end
|
||||||
end
|
end
|
||||||
`undef invalid_instruction
|
`undef invalid_instruction
|
||||||
|
|
||||||
@ -966,7 +1012,7 @@ endmodule
|
|||||||
// verilator lint_on BLKSEQ
|
// verilator lint_on BLKSEQ
|
||||||
|
|
||||||
|
|
||||||
/* IN: {CIR[15:8],CIR[5:3]} */
|
/* IN: {INSTRUCTION[31:24],INSTRUCTION[21:19]} */
|
||||||
/* OUT: number in bytes */
|
/* OUT: number in bytes */
|
||||||
module InstrSize ( input [10:0] IN, output reg [2:0] VERDICT );
|
module InstrSize ( input [10:0] IN, output reg [2:0] VERDICT );
|
||||||
always @( IN ) begin
|
always @( IN ) begin
|
||||||
|
@ -24,9 +24,7 @@
|
|||||||
`define EXEC_WAIT 4'b1100
|
`define EXEC_WAIT 4'b1100
|
||||||
|
|
||||||
/*DECODE SATE*/
|
/*DECODE SATE*/
|
||||||
`define EXEC_DE_LOAD_16_PARAM 4'b0010
|
|
||||||
`define EXEC_DE_LOAD_REG_TO_PARAM 4'b0011
|
`define EXEC_DE_LOAD_REG_TO_PARAM 4'b0011
|
||||||
`define EXEC_DE_LOAD_8_PARAM 4'b0100
|
|
||||||
|
|
||||||
/*MEM/IO READ*/
|
/*MEM/IO READ*/
|
||||||
`define EXEC_MEMIO_READ 4'b0101
|
`define EXEC_MEMIO_READ 4'b0101
|
||||||
|
@ -17,8 +17,12 @@
|
|||||||
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
||||||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||||||
|
|
||||||
|
`include "exec_state_def.v"
|
||||||
|
`include "alu_header.v"
|
||||||
|
`include "error_header.v"
|
||||||
|
|
||||||
module execute_unit (
|
module execute_unit (
|
||||||
/* GENERAL */ input clock, input reset ,input Wbit, input Sbit, input opcode_size,input [23:0] INSTRUCTION_BUFFER,input valid_input
|
/* GENERAL */ input clock, input reset ,input Wbit , input valid_input
|
||||||
/* */ ,input [2:0] IN_MOD, input [2:0] OUT_MOD, input memio_address_select, input [15:0] ProgCount, input [2:0] RM, output reg [`ERROR_BITS-1:0] ERROR , input write /*TODO: REMOVE!!*/
|
/* */ ,input [2:0] IN_MOD, input [2:0] OUT_MOD, input memio_address_select, input [15:0] ProgCount, input [2:0] RM, output reg [`ERROR_BITS-1:0] ERROR , input write /*TODO: REMOVE!!*/
|
||||||
/* */ ,input set_initial_values, output reg next_exec
|
/* */ ,input set_initial_values, output reg next_exec
|
||||||
/* PARAM */ ,input [15:0] PARAM1_INIT, input [15:0] PARAM2_INIT
|
/* PARAM */ ,input [15:0] PARAM1_INIT, input [15:0] PARAM2_INIT
|
||||||
@ -115,44 +119,6 @@ always @(posedge clock) begin
|
|||||||
default: exec_state <= `EXEC_WRITE_ENTRY;
|
default: exec_state <= `EXEC_WRITE_ENTRY;
|
||||||
endcase
|
endcase
|
||||||
end
|
end
|
||||||
`EXEC_DE_LOAD_8_PARAM:begin
|
|
||||||
if(opcode_size==0)begin
|
|
||||||
if({Sbit,Wbit}==2'b11)begin
|
|
||||||
/*signed "16bit" read*/
|
|
||||||
PARAM1 <= {{8{INSTRUCTION_BUFFER[23:23]}},INSTRUCTION_BUFFER[23:16]};
|
|
||||||
end else begin
|
|
||||||
PARAM1[7:0] <= INSTRUCTION_BUFFER[23:16];
|
|
||||||
end
|
|
||||||
case(IN_MOD)
|
|
||||||
3'b000,3'b001,3'b010: exec_state <= `EXEC_MEMIO_READ;
|
|
||||||
default: exec_state <= `EXEC_WRITE_ENTRY;
|
|
||||||
endcase
|
|
||||||
end else begin
|
|
||||||
if({Sbit,Wbit}==2'b11)begin
|
|
||||||
/*signed "16bit" read*/
|
|
||||||
PARAM1 <= {{8{INSTRUCTION_BUFFER[15:15]}},INSTRUCTION_BUFFER[15:8]};
|
|
||||||
end else begin
|
|
||||||
PARAM1[7:0] <= INSTRUCTION_BUFFER[15:8];
|
|
||||||
end
|
|
||||||
end
|
|
||||||
case(IN_MOD)
|
|
||||||
3'b000,3'b001,3'b010: exec_state <= `EXEC_MEMIO_READ;
|
|
||||||
default: exec_state <= `EXEC_WRITE_ENTRY;
|
|
||||||
endcase
|
|
||||||
end
|
|
||||||
`EXEC_DE_LOAD_16_PARAM:begin
|
|
||||||
if(opcode_size==0)begin
|
|
||||||
PARAM1[7:0] <= INSTRUCTION_BUFFER[23:16];
|
|
||||||
PARAM1[15:8] <= INSTRUCTION_BUFFER[15:8];
|
|
||||||
end else begin
|
|
||||||
PARAM1[15:8] <= INSTRUCTION_BUFFER[7:0];
|
|
||||||
PARAM1[7:0] <= INSTRUCTION_BUFFER[15:8];
|
|
||||||
end
|
|
||||||
case(IN_MOD)
|
|
||||||
3'b000,3'b001,3'b010: exec_state <= `EXEC_MEMIO_READ;
|
|
||||||
default: exec_state <= `EXEC_WRITE_ENTRY;
|
|
||||||
endcase
|
|
||||||
end
|
|
||||||
`EXEC_MEMIO_READ:begin
|
`EXEC_MEMIO_READ:begin
|
||||||
/*Decode MOD R/M, read the data and place it to PARAM1*/
|
/*Decode MOD R/M, read the data and place it to PARAM1*/
|
||||||
case (IN_MOD)
|
case (IN_MOD)
|
||||||
|
@ -20,13 +20,6 @@
|
|||||||
`include "exec_state_def.v"
|
`include "exec_state_def.v"
|
||||||
`include "alu_header.v"
|
`include "alu_header.v"
|
||||||
`include "config.v"
|
`include "config.v"
|
||||||
`include "ucode_header.v"
|
|
||||||
`include "error_header.v"
|
|
||||||
|
|
||||||
`define PROC_STATE_BITS 3
|
|
||||||
`define PROC_RESET 3'b000
|
|
||||||
`define PROC_DE_STATE_ENTRY 3'b001
|
|
||||||
`define PROC_HALT 3'b011
|
|
||||||
|
|
||||||
//HALT: active high
|
//HALT: active high
|
||||||
//IOMEM: 1=IO 0=MEM
|
//IOMEM: 1=IO 0=MEM
|
||||||
@ -82,11 +75,9 @@ assign OUT_MOD=DE_OUTPUT[49:47];
|
|||||||
wire [`ALU_OP_BITS-1:0] ALU_OP;
|
wire [`ALU_OP_BITS-1:0] ALU_OP;
|
||||||
assign ALU_OP = DE_OUTPUT[42:40];
|
assign ALU_OP = DE_OUTPUT[42:40];
|
||||||
|
|
||||||
wire [23:0] DE2EX_INSTRUCTION;
|
|
||||||
|
|
||||||
wire next_exec;
|
wire next_exec;
|
||||||
execute_unit execute_unit (
|
execute_unit execute_unit (
|
||||||
/* GENERAL */ clock, reset, Wbit, Sbit, opcode_size, DE2EX_INSTRUCTION[23:0] , valid_exec_data
|
/* GENERAL */ clock, reset, Wbit, valid_exec_data
|
||||||
/* */ ,IN_MOD, OUT_MOD,memio_address_select, ProgCount, RM, EXEC_ERROR, write
|
/* */ ,IN_MOD, OUT_MOD,memio_address_select, ProgCount, RM, EXEC_ERROR, write
|
||||||
/* */ ,set_initial_values,next_exec
|
/* */ ,set_initial_values,next_exec
|
||||||
/* PARAM */ ,PARAM1_INIT,PARAM2_INIT
|
/* PARAM */ ,PARAM1_INIT,PARAM2_INIT
|
||||||
@ -122,13 +113,14 @@ assign BIU_DATA= biu_data_direction ? 16'hz : (memio_address_select ? reg_read_p
|
|||||||
/*############ Decoder ########################################################## */
|
/*############ Decoder ########################################################## */
|
||||||
|
|
||||||
|
|
||||||
|
/* verilator lint_off UNUSEDSIGNAL */ //TODO
|
||||||
wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT;
|
wire [`EXEC_STATE_BITS+`ERROR_BITS+65:0] DE_OUTPUT;
|
||||||
|
|
||||||
decoder decoder(
|
decoder decoder(
|
||||||
/* GENERAL */ clock, reset,
|
/* GENERAL */ clock, reset,
|
||||||
/* INPUT FROM IF */ INSTRUCTION,VALID_INSTRUCTION,INSTRUCTION_LOCATION
|
/* INPUT FROM IF */ INSTRUCTION,VALID_INSTRUCTION,INSTRUCTION_LOCATION
|
||||||
/* INPUT FROM EX */ ,EX2DE_FLAGS[7:0],next_exec
|
/* INPUT FROM EX */ ,EX2DE_FLAGS[7:0],next_exec
|
||||||
/* OUTPUT TO EX */ ,DE_OUTPUT,DE2EX_INSTRUCTION
|
/* OUTPUT TO EX */ ,DE_OUTPUT
|
||||||
/* */ ,ProgCount,set_initial_values,valid_exec_data
|
/* */ ,ProgCount,set_initial_values,valid_exec_data
|
||||||
/* OUTPUT TO IF */ ,VALID_INSTRUCTION_ACK
|
/* OUTPUT TO IF */ ,VALID_INSTRUCTION_ACK
|
||||||
`ifdef CALCULATE_IPC
|
`ifdef CALCULATE_IPC
|
||||||
@ -152,9 +144,7 @@ assign reg_write_addr=DE_OUTPUT[61:58];
|
|||||||
wire MEM_OR_IO;
|
wire MEM_OR_IO;
|
||||||
assign MEM_OR_IO = DE_OUTPUT[7:7];
|
assign MEM_OR_IO = DE_OUTPUT[7:7];
|
||||||
|
|
||||||
wire Wbit, Sbit, opcode_size;
|
wire Wbit;
|
||||||
assign opcode_size=DE_OUTPUT[62:62];
|
|
||||||
assign Sbit=DE_OUTPUT[63:63];
|
|
||||||
assign Wbit=DE_OUTPUT[64:64];
|
assign Wbit=DE_OUTPUT[64:64];
|
||||||
|
|
||||||
wire [`ERROR_BITS-1:0] DE_ERROR;
|
wire [`ERROR_BITS-1:0] DE_ERROR;
|
||||||
|
Loading…
Reference in New Issue
Block a user