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More cachefsm cleanup.

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This commit is contained in:
Ross Thompson 2022-02-07 10:54:22 -06:00
parent 529d8b629a
commit 5536e3ca90
1 changed files with 7 additions and 21 deletions
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28
pipelined/src/cache/cachefsm.sv vendored
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@ -140,11 +140,7 @@ module cachefsm
// *** Ross simplify: factor out next state and output logic
always_comb begin
PreSelAdr = 2'b00;
//SelFlush = 1'b0;
FlushWayCntEn = 1'b0;
FlushAdrCntRst = 1'b0;
FlushWayCntRst = 1'b0;
VDWriteEnable = 1'b0;
//VDWriteEnable = 1'b0;
NextState = STATE_READY;
CacheFetchLine = 1'b0;
CacheWriteLine = 1'b0;
@ -170,8 +166,6 @@ module cachefsm
// Flush dcache to next level of memory
else if(FlushCache) begin
NextState = STATE_FLUSH;
FlushAdrCntRst = 1'b1;
FlushWayCntRst = 1'b1;
end
// amo hit
@ -326,41 +320,32 @@ module cachefsm
STATE_FLUSH: begin
// intialize flush counters
//SelFlush = 1'b1;
PreSelAdr = 2'b10;
NextState = STATE_FLUSH_CHECK;
end
STATE_FLUSH_CHECK: begin
PreSelAdr = 2'b10;
//SelFlush = 1'b1;
if(VictimDirty) begin
NextState = STATE_FLUSH_WRITE_BACK;
FlushWayCntEn = 1'b0;
CacheWriteLine = 1'b1;
end else if (FlushAdrFlag & FlushWayFlag) begin
NextState = STATE_READY;
PreSelAdr = 2'b00;
FlushWayCntEn = 1'b0;
end else if(FlushWayFlag) begin
NextState = STATE_FLUSH_INCR;
FlushWayCntEn = 1'b1;
end else begin
FlushWayCntEn = 1'b1;
NextState = STATE_FLUSH_CHECK;
end
end
STATE_FLUSH_INCR: begin
PreSelAdr = 2'b10;
//SelFlush = 1'b1;
FlushWayCntRst = 1'b1;
NextState = STATE_FLUSH_CHECK;
end
STATE_FLUSH_WRITE_BACK: begin
PreSelAdr = 2'b10;
//SelFlush = 1'b1;
if(CacheBusAck) begin
NextState = STATE_FLUSH_CLEAR_DIRTY;
end else begin
@ -369,20 +354,16 @@ module cachefsm
end
STATE_FLUSH_CLEAR_DIRTY: begin
VDWriteEnable = 1'b1;
//SelFlush = 1'b1;
//VDWriteEnable = 1'b1;
PreSelAdr = 2'b10;
FlushWayCntEn = 1'b0;
if(FlushAdrFlag & FlushWayFlag) begin
NextState = STATE_READY;
PreSelAdr = 2'b00;
end else if (FlushWayFlag) begin
NextState = STATE_FLUSH_INCR;
FlushWayCntEn = 1'b1;
end else begin
NextState = STATE_FLUSH_CHECK;
FlushWayCntEn = 1'b1;
end
end
@ -427,6 +408,11 @@ module cachefsm
(CurrState == STATE_FLUSH_CLEAR_DIRTY);
assign FlushAdrCntEn = (CurrState == STATE_FLUSH_CHECK & VictimDirty & FlushWayFlag & ~FlushAdrFlag) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & FlushWayFlag & ~FlushAdrFlag);
assign FlushWayCntEn = (CurrState == STATE_FLUSH_CHECK & VictimDirty & ~(FlushAdrFlag & FlushWayFlag)) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & ~(FlushAdrFlag & FlushWayFlag));
assign FlushAdrCntRst = (CurrState == STATE_READY & DoFlush);
assign FlushWayCntRst = (CurrState == STATE_READY & DoFlush) | (CurrState == STATE_FLUSH_INCR);
assign VDWriteEnable = (CurrState == STATE_FLUSH_CLEAR_DIRTY);
endmodule // cachefsm