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Fixed some relatively low hanging fruit

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(Tim) Efthimis Kritikos 2023-11-04 06:59:46 +00:00
parent 934e2f5a36
commit 694f708a32
2 changed files with 15 additions and 18 deletions
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25
system/biu.v
View File

@ -89,19 +89,6 @@ wire [`L1_CACHE_SIZE-1:0] FIFO_SIZE = FIFO_end-FIFO_start;
reg [3:0] biu_state;
reg sane;
always @(negedge reset) begin
biu_state <= `BIU_HALT;
write <= 1;
sane <= 0;
end
always @(posedge reset) begin
biu_state <= `BIU_RESET1;
/* verilator lint_off BLKSEQ */
FIFO_start = `L1_CACHE_SIZE'b0;
FIFO_end = `L1_CACHE_SIZE'b0;
/* verilator lint_on BLKSEQ */
end
reg jump_req_latch;
reg func;
@ -111,7 +98,16 @@ reg [19:0]DATA_ADDRESS;
assign external_address_bus= func ? INSTRUCTION_ADDRESS : DATA_ADDRESS ;
always @(posedge clock) begin
if ( jump_req_latch ) begin
if ( reset == 0 ) begin
biu_state <= `BIU_HALT;
write <= 1;
sane <= 0;
biu_state <= `BIU_RESET1;
/* verilator lint_off BLKSEQ */
FIFO_start = `L1_CACHE_SIZE'b0;
FIFO_end = `L1_CACHE_SIZE'b0;
/* verilator lint_on BLKSEQ */
end else if ( jump_req_latch ) begin
INSTRUCTION_ADDRESS <= { 4'b0 , ADDRESS_INPUT };
INSTRUCTION_LOCATION <= ADDRESS_INPUT;
func <= 1;
@ -401,7 +397,6 @@ always @( posedge jump_req ) begin
FIFO_start = FIFO_end ;
/* verilator lint_on BLKSEQ */
jump_req_latch <= 1;
VALID_INSTRUCTION <= 0;
end
endmodule

8
system/decoder.v
View File

@ -270,8 +270,8 @@ wire [`UCODE_DATA_BITS-1:0] ucode_data;
microcode ucode(seq_addr_input,ucode_data);
`define invalid_instruction next_state=`EXEC_WAIT;ERROR<=`ERR_UNIMPL_INSTRUCTION;IN_MOD=3'b011;seq_addr_entry<=`UCODE_NO_INSTRUCTION;
`define unimpl_addressing_mode next_state=`EXEC_WAIT;ERROR <= `ERR_UNIMPL_ADDRESSING_MODE;IN_MOD=3'b011;seq_addr_entry<=`UCODE_NO_INSTRUCTION;
`define invalid_instruction next_state=`EXEC_WAIT;ERROR<=`ERR_UNIMPL_INSTRUCTION;HALT<=0;IN_MOD=3'b011;seq_addr_entry<=`UCODE_NO_INSTRUCTION;opcode_size=0;DEPENDS_ON_PREVIOUS<=0;
`define unimpl_addressing_mode next_state=`EXEC_WAIT;ERROR <= `ERR_UNIMPL_ADDRESSING_MODE;HALT<=0;IN_MOD=3'b011;seq_addr_entry<=`UCODE_NO_INSTRUCTION;
//TODO: A possible optimisation for instruction with 8bit parameter and
@ -833,13 +833,14 @@ always @( FLAGS or INSTRUCTION or SIMPLE_MICRO or seq_addr_input ) begin
in_alu_sel2=2'b11;
reg_read_port1_addr={Wbit,3'b000};
PARAM_ACTION=`LOAD_8;
MEM_OR_IO=1;
HALT <= 0;
PARAM1=0;
OUT_MOD={3'b000};
DEPENDS_ON_PREVIOUS<=0;
IN_MOD=3'b011;
next_state=`EXEC_WRITE_ENTRY;
`normal_instruction
MEM_OR_IO=1;
end
11'b1100_1111_???:begin
/* IRET - Return from interrupt */
@ -987,6 +988,7 @@ always @( FLAGS or INSTRUCTION or SIMPLE_MICRO or seq_addr_input ) begin
memio_address_select=ucode_data[39:39];
MEM_OR_IO=0;
HALT <= 0;
ERROR <= 0; //TODO probably, right?
end
if(PARAM_ACTION==`LOAD_8)begin