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make Cache Flush Logic dependent on !READ_ONLY_CACHE

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read-only caches do not have flush logic since they do not have to
deal with dirty bits.
This commit is contained in:
Alec Vercruysse 2023-04-05 11:45:26 -07:00
parent 247af17b6b
commit d3a988c96c
1 changed files with 18 additions and 12 deletions
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30
src/cache/cache.sv vendored
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@ -188,19 +188,25 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
// Flush logic
/////////////////////////////////////////////////////////////////////////////////////////////
// Flush address (line number)
assign ResetOrFlushCntRst = reset | FlushCntRst;
flopenr #(SETLEN) FlushAdrReg(clk, ResetOrFlushCntRst, FlushAdrCntEn, FlushAdrP1, NextFlushAdr);
mux2 #(SETLEN) FlushAdrMux(NextFlushAdr, FlushAdrP1, FlushAdrCntEn, FlushAdr);
assign FlushAdrP1 = NextFlushAdr + 1'b1;
assign FlushAdrFlag = (NextFlushAdr == FLUSHADRTHRESHOLD[SETLEN-1:0]);
// Flush way
flopenl #(NUMWAYS) FlushWayReg(clk, FlushWayCntEn, ResetOrFlushCntRst, {{NUMWAYS-1{1'b0}}, 1'b1}, NextFlushWay, FlushWay);
if(NUMWAYS > 1) assign NextFlushWay = {FlushWay[NUMWAYS-2:0], FlushWay[NUMWAYS-1]};
else assign NextFlushWay = FlushWay[NUMWAYS-1];
assign FlushWayFlag = FlushWay[NUMWAYS-1];
if (!READ_ONLY_CACHE) begin:flushlogic
// Flush address (line number)
assign ResetOrFlushCntRst = reset | FlushCntRst;
flopenr #(SETLEN) FlushAdrReg(clk, ResetOrFlushCntRst, FlushAdrCntEn, FlushAdrP1, NextFlushAdr);
mux2 #(SETLEN) FlushAdrMux(NextFlushAdr, FlushAdrP1, FlushAdrCntEn, FlushAdr);
assign FlushAdrP1 = NextFlushAdr + 1'b1;
assign FlushAdrFlag = (NextFlushAdr == FLUSHADRTHRESHOLD[SETLEN-1:0]);
// Flush way
flopenl #(NUMWAYS) FlushWayReg(clk, FlushWayCntEn, ResetOrFlushCntRst, {{NUMWAYS-1{1'b0}}, 1'b1}, NextFlushWay, FlushWay);
if(NUMWAYS > 1) assign NextFlushWay = {FlushWay[NUMWAYS-2:0], FlushWay[NUMWAYS-1]};
else assign NextFlushWay = FlushWay[NUMWAYS-1];
assign FlushWayFlag = FlushWay[NUMWAYS-1];
end // block: flushlogic
else begin:flushlogic
assign FlushWayFlag = 0;
assign FlushAdrFlag = 0;
end
/////////////////////////////////////////////////////////////////////////////////////////////
// Cache FSM
/////////////////////////////////////////////////////////////////////////////////////////////