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Cleaned up some pieces of code and fixed a bug

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This commit is contained in:
(Tim) Efthimis Kritikos 2023-05-04 00:48:55 +01:00
parent 1fd58fd62e
commit f4b22951d0
8 changed files with 14 additions and 27 deletions
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20
system/decoder.v
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@ -76,8 +76,6 @@ wire [`UCODE_DATA_BITS-1:0] ucode_data;
microcode ucode(seq_addr_input,ucode_data);
/* 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 */
`define invalid_instruction next_state=`PROC_IF_STATE_ENTRY;ERROR<=1;IN_MOD=3'b011;seq_addr_entry<=`UCODE_NO_INSTRUCTION;
@ -648,11 +646,11 @@ always @( CIR or SIMPLE_MICRO or seq_addr_input ) begin
3'b100: next_state=`PROC_MEMIO_READ_SETADDR;
default: begin end /*impossible*/
endcase
if(ucode_data[36:36]==0)
reg_write_addr=ucode_data[12:9 ];
in_alu1_sel1 =ucode_data[14:13];
in_alu1_sel2 =ucode_data[16:15];
OUT_MOD =ucode_data[19:17];
if(ucode_data[36:36]==0) /*Set reg write address*/
reg_write_addr = ucode_data[12:9 ];
in_alu1_sel1 = ucode_data[14:13];
in_alu1_sel2 = ucode_data[16:15];
OUT_MOD = ucode_data[19:17];
/*1:1 map essentially but I want to keep the spec for these bits separate
* from the alu op select bits*/
case(ucode_data[22:20])
@ -666,13 +664,13 @@ always @( CIR or SIMPLE_MICRO or seq_addr_input ) begin
3'b111: ALU_1OP=`ALU_OP_SHIFT_LEFT;
default: begin end
endcase
if(ucode_data[34:34]==0)
if(ucode_data[34:34]==0) /* Set reg read port 1 address */
reg_read_port1_addr=ucode_data[26:23];
IN_MOD=ucode_data[29:27];
if(ucode_data[35:35]==0)
if(ucode_data[35:35]==0) /* Set reg read port 1 address */
reg_read_port2_addr=ucode_data[33:30];
if(ucode_data[38:38]==1)
Wbit=ucode_data[37:37];
if(ucode_data[37:37]==1) /* Overwrite Wbit */
Wbit=ucode_data[38:38];
memio_address_select=ucode_data[39:39];
MEM_OR_IO=0;
end

2
system/general.v
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@ -22,8 +22,10 @@ input [1:0] sel;
parameter WIDTH=16;
input [WIDTH-1:0] in1,in2,in3,in4;
output [WIDTH-1:0] out;
assign out = (sel == 'b00) ? in1 :
(sel == 'b01) ? in2 :
(sel == 'b10) ? in3 :
in4;
endmodule

4
system/memory.v
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@ -17,7 +17,7 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
// don't ask for the full 1MiB especially since we don't even have segmentation
/* This warning is because we don't use the full address bus. */
/* verilator lint_off UNUSEDSIGNAL */
module doublemem(input [19:0] address,inout wire [15:0] data ,input rd,input wr,input BHE,input cs);
/* verilator lint_on UNUSEDSIGNAL */
@ -35,7 +35,7 @@ end
assign data[7:0] = !address[0:0] & !rd & !cs ? memory[address[16:1]][15:8] : 8'hz;
assign data[15:8] = !BHE & !rd & !cs ? memory[address[16:1]][7:0] : 8'hz;
assign data[15:8] = !BHE & !rd & !cs ? memory[address[16:1]][7:0] : 8'hz;
always @(negedge wr) begin
if(BHE==0)

1
system/proc_state_def.v
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@ -51,7 +51,6 @@
/*MEM/IO WRITE*/
`define PROC_MEMIO_WRITE 6'b101000
//`define PROC_MEMIO_WRITE_SETADDR 6'b010101
`define PROC_MEMIO_PUT_ALIGNED_16BIT_DATA 6'b101001
`define PROC_MEMIO_PUT_UNALIGNED_16BIT_DATA 6'b101010
`define PROC_MEMIO_PUT_BYTE 6'b101011

7
system/processor.v
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@ -134,13 +134,6 @@ register_file register_file(
reg [15:0] ProgCount;
// verilator lint_off UNUSEDSIGNAL
wire [15:0] ProgCount_next_opcode;
wire [15:0] ProgCount_arg;
assign ProgCount_next_opcode=ProgCount+{13'b0,instruction_size};
assign ProgCount_arg=ProgCount+{15'b0,opcode_size}+16'd1;
// verilator lint_on UNUSEDSIGNAL
/*############ ALU / Execution units ########################################################## */
// ALU 1
reg [1:0] in_alu1_sel1;

3
system/system.v
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@ -36,9 +36,6 @@ end
always @(negedge wr) begin
if(IOMEM==1'b1 && address_bus[7:0]==8'hA5 )
$write("%s" ,data_bus[15:8]);
//if(CIR[7:0]==8'h21 && register_file.registers[0][15:8]==8'h02)begin
// $write("%s" ,register_file.registers[2][7:0]);
//end
end
reg [1:0] finish;

3
system/testbench.cpp
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@ -17,9 +17,6 @@ void tick() {
system_state->clock = 0;
contextp->timeInc(timeinc);
system_state->eval();
//printf("tick() %04x\n",system_state->address_bus);
//trace->dump(timestamp);
//timestamp += 500/MHz;
}
int main(int argc, char** argv) {

1
system/ucode.txt
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@ -19,6 +19,7 @@
//mas: MemIo Address Select
// 0: register file output 1: alu output
//
//wbo: Wbit overwrite, {VALUE,ENABLE}. ex 11 would force one, 10 wouldn't do anything
//
//krs: Keep registers, selects weather the register port 1 and/or 2