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Added config to allow using the save/restore or replay implementation to handle sram clocked read delay.

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This commit is contained in:
Ross Thompson 2022-02-04 23:19:00 -06:00
parent ea84211ff9
commit d21be9d998
12 changed files with 37 additions and 19 deletions
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2
pipelined/config/buildroot/wally-config.vh
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@ -124,3 +124,5 @@
`define BPRED_ENABLED 1
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

2
pipelined/config/fpga/wally-config.vh
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@ -130,3 +130,5 @@
`define BPRED_ENABLED 1
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 1
`define REPLAY 0

2
pipelined/config/rv32etim/wally-config.vh
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@ -127,3 +127,5 @@
`define BPRED_ENABLED 0
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

2
pipelined/config/rv32gc/wally-config.vh
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@ -126,3 +126,5 @@
`define BPRED_ENABLED 1
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

2
pipelined/config/rv32ic/wally-config.vh
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@ -126,3 +126,5 @@
`define BPRED_ENABLED 1
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

2
pipelined/config/rv32tim/wally-config.vh
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@ -126,3 +126,5 @@
`define BPRED_ENABLED 1
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

2
pipelined/config/rv64BP/wally-config.vh
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@ -129,3 +129,5 @@
//`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPTWOBIT or "BPGLOBAL" or BPLOCALPAg or BPGSHARE
`define TESTSBP 1
`define REPLAY 0

1
pipelined/config/rv64gc/wally-config.vh
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@ -130,3 +130,4 @@
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

1
pipelined/config/rv64ic/wally-config.vh
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@ -130,3 +130,4 @@
`define BPTYPE "BPGSHARE" // BPLOCALPAg or BPGLOBAL or BPTWOBIT or BPGSHARE
`define TESTSBP 0
`define REPLAY 0

6
pipelined/src/cache/cache.sv vendored
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@ -147,8 +147,10 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, DCACHE = 1) (
// There are two ways to resolve. 1. We can replay the read of the sram or we can save
// the data. Replay is eaiser but creates a longer critical path.
// save/restore only wayhit and readdata.
flopenr #(NUMWAYS) wayhitsavereg(clk, save, reset, WayHitRaw, WayHitSaved);
mux2 #(NUMWAYS) saverestoremux(WayHitRaw, WayHitSaved, restore, WayHit);
if(!`REPLAY) begin
flopenr #(NUMWAYS) wayhitsavereg(clk, save, reset, WayHitRaw, WayHitSaved);
mux2 #(NUMWAYS) saverestoremux(WayHitRaw, WayHitSaved, restore, WayHit);
end else assign WayHit = WayHitRaw;
/////////////////////////////////////////////////////////////////////////////////////////////
// Write Path: Write Enables

25
pipelined/src/cache/cachefsm.sv vendored
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@ -181,8 +181,8 @@ module cachefsm
if(CPUBusy) begin
NextState = STATE_CPU_BUSY_FINISH_AMO;
//PreSelAdr = 2'b01; `REPLAY
save = 1'b1;
if (`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
end
else begin
SRAMWordWriteEnable = 1'b1;
@ -198,8 +198,8 @@ module cachefsm
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
//PreSelAdr = 2'b01; `REPLAY
save = 1'b1;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -215,8 +215,8 @@ module cachefsm
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
//PreSelAdr = 2'b01; `REPLAY
save = 1'b1;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -276,7 +276,6 @@ module cachefsm
end
STATE_MISS_READ_WORD_DELAY: begin
//PreSelAdr = 2'b01; `REPLAY
SRAMWordWriteEnable = 1'b0;
SetDirty = 1'b0;
LRUWriteEn = 1'b0;
@ -284,7 +283,7 @@ module cachefsm
PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY_FINISH_AMO;
save = 1'b1;
if(~`REPLAY) save = 1'b1;
end
else begin
SRAMWordWriteEnable = 1'b1;
@ -296,8 +295,8 @@ module cachefsm
LRUWriteEn = 1'b1;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
//PreSelAdr = 2'b01; `REPLAY
save = 1'b1;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -312,8 +311,8 @@ module cachefsm
LRUWriteEn = 1'b1;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
//PreSelAdr = 2'b01; `REPLAY
save = 1'b1;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -337,7 +336,7 @@ module cachefsm
restore = 1'b1;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
//PreSelAdr = 2'b01; `REPLAY
if(`REPLAY) PreSelAdr = 2'b01;
end
else begin
NextState = STATE_READY;

9
pipelined/src/cache/subcachelineread.sv vendored
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@ -61,8 +61,9 @@ module subcachelineread #(parameter LINELEN, WORDLEN, MUXINTERVAL)(
end
// variable input mux
assign ReadDataWordRaw = ReadDataLineSets[PAdr[$clog2(LINELEN/8) - 1 : $clog2(MUXINTERVAL/8)]];
flopen #(WORDLEN) cachereaddatasavereg(clk, save, ReadDataWordRaw, ReadDataWordSaved);
mux2 #(WORDLEN) readdatasaverestoremux(ReadDataWordRaw, ReadDataWordSaved,
restore, ReadDataWord);
if(!`REPLAY) begin
flopen #(WORDLEN) cachereaddatasavereg(clk, save, ReadDataWordRaw, ReadDataWordSaved);
mux2 #(WORDLEN) readdatasaverestoremux(ReadDataWordRaw, ReadDataWordSaved,
restore, ReadDataWord);
end else assign ReadDataWord = ReadDataWordRaw;
endmodule