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Fixed simulation with icarus verilog and removed another driver conflict

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(Tim) Efthimis Kritikos 2023-11-05 19:43:49 +00:00
parent 4a5df9c74e
commit 9947517693
1 changed files with 39 additions and 51 deletions
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90
system/biu.v
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@ -101,14 +101,10 @@ always @(posedge clock) begin
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 */
FIFO_start <= `L1_CACHE_SIZE'b0;
FIFO_end <= `L1_CACHE_SIZE'b0;
end else if ( jump_req ) begin
/* verilator lint_off BLKSEQ */
FIFO_start = FIFO_end ;
/* verilator lint_on BLKSEQ */
FIFO_start <= FIFO_end ;
INSTRUCTION_ADDRESS <= { 4'b0 , ADDRESS_INPUT };
INSTRUCTION_LOCATION <= ADDRESS_INPUT;
func <= 1;
@ -125,9 +121,7 @@ always @(posedge clock) begin
IOMEM <= MEM_OR_IO;
biu_state <= (Wbit==0) ? `BIU_PUT_BYTE : (ADDRESS_INPUT[0:0]?`BIU_PUT_UNALIGNED_16BIT_DATA:`BIU_PUT_ALIGNED_16BIT_DATA) ;
INSTRUCTION_ADDRESS <= {4'b0,INSTRUCTION_LOCATION} ;
/* verilator lint_off BLKSEQ */
FIFO_end=FIFO_start;
/* verilator lint_on BLKSEQ */
FIFO_end<=FIFO_start;
end else if ( read_request ) begin
func<=0;
DATA_ADDRESS <= { 4'b0 , ADDRESS_INPUT };
@ -155,23 +149,17 @@ always @(posedge clock) begin
/*************** INSTRUCTION FIFO READ ***************/
`BIU_READ: begin
if(INSTRUCTION_ADDRESS[0:0]==0 && FIFO_SIZE<{{(`L1_CACHE_SIZE-1){1'b1}},1'b0})begin
/* verilator lint_off BLKSEQ */
INPUT_FIFO[FIFO_end] = external_data_bus_read[7:0];
INPUT_FIFO[FIFO_end+`L1_CACHE_SIZE'd1] = external_data_bus_read[15:8];
FIFO_end = FIFO_end+`L1_CACHE_SIZE'd2;
/* verilator lint_on BLKSEQ */
INPUT_FIFO[FIFO_end] <= external_data_bus_read[7:0];
INPUT_FIFO[FIFO_end+`L1_CACHE_SIZE'd1] <= external_data_bus_read[15:8];
FIFO_end <= FIFO_end+`L1_CACHE_SIZE'd2;
INSTRUCTION_ADDRESS <= INSTRUCTION_ADDRESS+20'd2;
end else if(INSTRUCTION_ADDRESS[0:0]==0)begin
/* verilator lint_off BLKSEQ */
INPUT_FIFO[FIFO_end] = external_data_bus_read[7:0];
FIFO_end = FIFO_end+`L1_CACHE_SIZE'd1;
/* verilator lint_on BLKSEQ */
INPUT_FIFO[FIFO_end] <= external_data_bus_read[7:0];
FIFO_end <= FIFO_end+`L1_CACHE_SIZE'd1;
INSTRUCTION_ADDRESS <= INSTRUCTION_ADDRESS+20'd1;
end else begin
/* verilator lint_off BLKSEQ */
INPUT_FIFO[FIFO_end] = external_data_bus_read[15:8];
FIFO_end = FIFO_end+`L1_CACHE_SIZE'd1;
/* verilator lint_on BLKSEQ */
INPUT_FIFO[FIFO_end] <= external_data_bus_read[15:8];
FIFO_end <= FIFO_end+`L1_CACHE_SIZE'd1;
INSTRUCTION_ADDRESS <= INSTRUCTION_ADDRESS+20'd1;
end
biu_state <= `BIU_NEXT_ACTION;
@ -279,8 +267,8 @@ always @(posedge clock) begin
end
`BIU_RESET2: begin
/* verilator lint_off BLKSEQ */
FIFO_start = `L1_CACHE_SIZE'b0;
FIFO_end = `L1_CACHE_SIZE'b0;
FIFO_start <= `L1_CACHE_SIZE'b0;
FIFO_end <= `L1_CACHE_SIZE'b0;
/* verilator lint_on BLKSEQ */
biu_state <= `BIU_NEXT_ACTION;
INSTRUCTION_ADDRESS <= 20'h0FFF0;
@ -293,34 +281,9 @@ always @(posedge clock) begin
end
endcase
end
end
wire [2:0] Isize;
InstrSize InstrSize({INSTRUCTION[31:24],INSTRUCTION[21:19]},Isize);
/**** UPDATE VALID_INSTRUCTION ****/
`ifdef INCLUDE_EARLY_CALC_CIRUIT
wire [2:0] fifoIsize;
wire Isit1;
InstrSize fifoInstrSize({INPUT_FIFO[FIFO_start][7:0],INPUT_FIFO[FIFO_start+`L1_CACHE_SIZE'd1][5:3]},fifoIsize);
Is1 Is1(INPUT_FIFO[FIFO_start][7:0],Isit1);
`endif
`ifdef DOUBLE_INSTRUCTION_LOAD
wire [2:0] fifoIsize2;
InstrSize fifoInstrSize2(
{ INPUT_FIFO[FIFO_start+{{`L1_CACHE_SIZE-3{1'b0}},fifoIsize}][7:0], INPUT_FIFO[FIFO_start+{{`L1_CACHE_SIZE-3{1'b0}},fifoIsize}+`L1_CACHE_SIZE'd1][5:3]}
,fifoIsize2
);
`endif
always @( valid_instruction_ack ) begin
/* verilator lint_off BLKSEQ */
FIFO_start = FIFO_start + {{`L1_CACHE_SIZE-3{1'b0}},Isize};
/* verilator lint_on BLKSEQ */
INSTRUCTION_LOCATION <= INSTRUCTION_LOCATION + {13'd0,Isize};
end
always @( FIFO_start or FIFO_end ) begin
if(jump_req==1)begin
VALID_INSTRUCTION <= 0;
end else if(sane==1) begin
@ -396,4 +359,29 @@ always @( FIFO_start or FIFO_end ) begin
end
end
wire [2:0] Isize;
InstrSize InstrSize({INSTRUCTION[31:24],INSTRUCTION[21:19]},Isize);
`ifdef INCLUDE_EARLY_CALC_CIRUIT
wire [2:0] fifoIsize;
wire Isit1;
InstrSize fifoInstrSize({INPUT_FIFO[FIFO_start][7:0],INPUT_FIFO[FIFO_start+`L1_CACHE_SIZE'd1][5:3]},fifoIsize);
Is1 Is1(INPUT_FIFO[FIFO_start][7:0],Isit1);
`endif
`ifdef DOUBLE_INSTRUCTION_LOAD
wire [2:0] fifoIsize2;
InstrSize fifoInstrSize2(
{ INPUT_FIFO[FIFO_start+{{`L1_CACHE_SIZE-3{1'b0}},fifoIsize}][7:0], INPUT_FIFO[FIFO_start+{{`L1_CACHE_SIZE-3{1'b0}},fifoIsize}+`L1_CACHE_SIZE'd1][5:3]}
,fifoIsize2
);
`endif
always @( valid_instruction_ack ) begin
/* verilator lint_off BLKSEQ */
FIFO_start <= FIFO_start + {{`L1_CACHE_SIZE-3{1'b0}},Isize};
/* verilator lint_on BLKSEQ */
INSTRUCTION_LOCATION <= INSTRUCTION_LOCATION + {13'd0,Isize};
end
endmodule