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Make AdrSelMux and CacheBusAdrMux mux2 if READ_ONLY_CACHE

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Some address options are only used in the D$ case.
This commit is contained in:
Alec Vercruysse 2023-04-11 23:05:04 -07:00
parent 7c9f68e984
commit 5b8c6f070e
1 changed files with 19 additions and 9 deletions
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28
src/cache/cache.sv vendored
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@ -73,7 +73,6 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
logic SelAdr;
logic [1:0] AdrSelMuxSel;
logic [SETLEN-1:0] CacheSet;
logic [LINELEN-1:0] LineWriteData;
logic ClearDirty, SetDirty, SetValid;
@ -109,10 +108,18 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
// and FlushAdr when handling D$ flushes
// The icache must update to the newest PCNextF on flush as it is probably a trap. Trap
// sets PCNextF to XTVEC and the icache must start reading the instruction.
assign AdrSelMuxSel = {SelFlush, ((SelAdr | SelHPTW) & ~((READ_ONLY_CACHE == 1) & FlushStage))};
mux3 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN], FlushAdr,
if (!READ_ONLY_CACHE) begin
logic [1:0] AdrSelMuxSel;
assign AdrSelMuxSel = {SelFlush, SelAdr | SelHPTW};
mux3 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN], FlushAdr,
AdrSelMuxSel, CacheSet);
end
else begin
logic AdrSelMuxSel;
assign AdrSelMuxSel = ((SelAdr | SelHPTW) & ~FlushStage);
mux2 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN],
AdrSelMuxSel, CacheSet);
end
// Array of cache ways, along with victim, hit, dirty, and read merging logic
cacheway #(NUMLINES, LINELEN, TAGLEN, OFFSETLEN, SETLEN, READ_ONLY_CACHE) CacheWays[NUMWAYS-1:0](
.clk, .reset, .CacheEn, .CacheSet, .PAdr, .LineWriteData, .LineByteMask,
@ -152,11 +159,14 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
.PAdr(WordOffsetAddr), .ReadDataLine, .ReadDataWord);
// Bus address for fetch, writeback, or flush writeback
mux3 #(`PA_BITS) CacheBusAdrMux(.d0({PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d1({Tag, PAdr[SETTOP-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d2({Tag, FlushAdr, {OFFSETLEN{1'b0}}}),
.s({SelFlush, SelWriteback}), .y(CacheBusAdr));
if (!READ_ONLY_CACHE)
mux3 #(`PA_BITS) CacheBusAdrMux(.d0({PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d1({Tag, PAdr[SETTOP-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d2({Tag, FlushAdr, {OFFSETLEN{1'b0}}}),
.s({SelFlush, SelWriteback}), .y(CacheBusAdr));
else
assign CacheBusAdr = {PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}};
/////////////////////////////////////////////////////////////////////////////////////////////
// Write Path
/////////////////////////////////////////////////////////////////////////////////////////////