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Merged evict dirty clear with flush write back.

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Ross Thompson 2022-07-24 00:22:43 -05:00
parent 8193946996
commit cd68896637
1 changed files with 11 additions and 14 deletions
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21
pipelined/src/cache/cachefsm.sv vendored
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@ -95,8 +95,7 @@ module cachefsm
STATE_FLUSH, STATE_FLUSH,
STATE_FLUSH_CHECK, STATE_FLUSH_CHECK,
STATE_FLUSH_INCR, STATE_FLUSH_INCR,
STATE_FLUSH_WRITE_BACK, STATE_FLUSH_WRITE_BACK} statetype;
STATE_FLUSH_CLEAR_DIRTY} statetype;
(* mark_debug = "true" *) statetype CurrState, NextState; (* mark_debug = "true" *) statetype CurrState, NextState;
logic IgnoreRequest; logic IgnoreRequest;
@ -149,11 +148,11 @@ module cachefsm
else if(FlushWayFlag) NextState = STATE_FLUSH_INCR; else if(FlushWayFlag) NextState = STATE_FLUSH_INCR;
else NextState = STATE_FLUSH_CHECK; else NextState = STATE_FLUSH_CHECK;
STATE_FLUSH_INCR: NextState = STATE_FLUSH_CHECK; STATE_FLUSH_INCR: NextState = STATE_FLUSH_CHECK;
STATE_FLUSH_WRITE_BACK: if(CacheBusAck) NextState = STATE_FLUSH_CLEAR_DIRTY; STATE_FLUSH_WRITE_BACK: if(CacheBusAck) begin
else NextState = STATE_FLUSH_WRITE_BACK; if(FlushFlag) NextState = STATE_READY;
STATE_FLUSH_CLEAR_DIRTY: if(FlushFlag) NextState = STATE_READY;
else if(FlushWayFlag) NextState = STATE_FLUSH_INCR; else if(FlushWayFlag) NextState = STATE_FLUSH_INCR;
else NextState = STATE_FLUSH_CHECK; else NextState = STATE_FLUSH_CHECK;
end else NextState = STATE_FLUSH_WRITE_BACK;
default: NextState = STATE_READY; default: NextState = STATE_READY;
endcase endcase
end end
@ -169,27 +168,26 @@ module cachefsm
(CurrState == STATE_FLUSH_CHECK & ~(FlushFlag)) | (CurrState == STATE_FLUSH_CHECK & ~(FlushFlag)) |
(CurrState == STATE_FLUSH_INCR) | (CurrState == STATE_FLUSH_INCR) |
(CurrState == STATE_FLUSH_WRITE_BACK) | (CurrState == STATE_FLUSH_WRITE_BACK) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & ~(FlushFlag)); (CurrState == STATE_FLUSH_WRITE_BACK & ~(FlushFlag) & CacheBusAck);
// write enables internal to cache // write enables internal to cache
assign SetValid = CurrState == STATE_MISS_WRITE_CACHE_LINE; assign SetValid = CurrState == STATE_MISS_WRITE_CACHE_LINE;
assign SetDirty = (CurrState == STATE_READY & DoAnyUpdateHit) | assign SetDirty = (CurrState == STATE_READY & DoAnyUpdateHit) |
(CurrState == STATE_MISS_WRITE_CACHE_LINE & (AMO | CacheRW[0])); (CurrState == STATE_MISS_WRITE_CACHE_LINE & (AMO | CacheRW[0]));
assign ClearValid = '0; assign ClearValid = '0;
assign ClearDirty = (CurrState == STATE_MISS_WRITE_CACHE_LINE & ~(AMO | CacheRW[0])) | assign ClearDirty = (CurrState == STATE_MISS_WRITE_CACHE_LINE & ~(AMO | CacheRW[0])) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY); (CurrState == STATE_FLUSH_WRITE_BACK & CacheBusAck);
assign LRUWriteEn = (CurrState == STATE_READY & DoAnyHit) | assign LRUWriteEn = (CurrState == STATE_READY & DoAnyHit) |
(CurrState == STATE_MISS_WRITE_CACHE_LINE); (CurrState == STATE_MISS_WRITE_CACHE_LINE);
// Flush and eviction controls // Flush and eviction controls
assign SelEvict = (CurrState == STATE_MISS_EVICT_DIRTY_START) | assign SelEvict = (CurrState == STATE_MISS_EVICT_DIRTY_START) |
(CurrState == STATE_MISS_EVICT_DIRTY); (CurrState == STATE_MISS_EVICT_DIRTY);
assign SelFlush = (CurrState == STATE_FLUSH) | (CurrState == STATE_FLUSH_CHECK) | assign SelFlush = (CurrState == STATE_FLUSH) | (CurrState == STATE_FLUSH_CHECK) |
(CurrState == STATE_FLUSH_INCR) | (CurrState == STATE_FLUSH_WRITE_BACK) | (CurrState == STATE_FLUSH_INCR) | (CurrState == STATE_FLUSH_WRITE_BACK);
(CurrState == STATE_FLUSH_CLEAR_DIRTY);
assign FlushWayAndNotAdrFlag = FlushWayFlag & ~FlushAdrFlag; assign FlushWayAndNotAdrFlag = FlushWayFlag & ~FlushAdrFlag;
assign FlushAdrCntEn = (CurrState == STATE_FLUSH_CHECK & ~VictimDirty & FlushWayAndNotAdrFlag) | assign FlushAdrCntEn = (CurrState == STATE_FLUSH_CHECK & ~VictimDirty & FlushWayAndNotAdrFlag) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & FlushWayAndNotAdrFlag); (CurrState == STATE_FLUSH_WRITE_BACK & FlushWayAndNotAdrFlag & CacheBusAck);
assign FlushWayCntEn = (CurrState == STATE_FLUSH_CHECK & ~VictimDirty & ~(FlushFlag)) | assign FlushWayCntEn = (CurrState == STATE_FLUSH_CHECK & ~VictimDirty & ~(FlushFlag)) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & ~FlushFlag); (CurrState == STATE_FLUSH_WRITE_BACK & ~FlushFlag & CacheBusAck);
assign FlushAdrCntRst = (CurrState == STATE_READY); assign FlushAdrCntRst = (CurrState == STATE_READY);
assign FlushWayCntRst = (CurrState == STATE_READY) | (CurrState == STATE_FLUSH_INCR); assign FlushWayCntRst = (CurrState == STATE_READY) | (CurrState == STATE_FLUSH_INCR);
// Bus interface controls // Bus interface controls
@ -210,6 +208,5 @@ module cachefsm
assign SelBusBuffer = CurrState == STATE_MISS_WRITE_CACHE_LINE; assign SelBusBuffer = CurrState == STATE_MISS_WRITE_CACHE_LINE;
assign SRAMEnable = (CurrState == STATE_READY & ~CPUBusy | CacheStall) | (CurrState != STATE_READY) | reset; assign SRAMEnable = (CurrState == STATE_READY & ~CPUBusy | CacheStall) | (CurrState != STATE_READY) | reset;
//assign SRAMEnable = 1;
endmodule // cachefsm endmodule // cachefsm