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More cachefsm cleanup.

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This commit is contained in:
Ross Thompson 2022-02-07 12:30:27 -06:00
parent 7f732eb571
commit a6a7779ec0
1 changed files with 56 additions and 37 deletions
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93
pipelined/src/cache/cachefsm.sv vendored
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@ -139,14 +139,12 @@ module cachefsm
// next state logic and some state ouputs.
// *** Ross simplify: factor out next state and output logic
always_comb begin
PreSelAdr = 2'b00;
//PreSelAdr = 2'b00;
NextState = STATE_READY;
save = 1'b0;
restore = 1'b0;
case (CurrState)
STATE_READY: begin
PreSelAdr = 2'b00;
//PreSelAdr = 2'b00;
// TLB Miss
if(IgnoreRequest) begin
@ -156,7 +154,7 @@ module cachefsm
// PTW ready the CPU will stall.
// The page table walker asserts it's control 1 cycle
// after the TLBs miss.
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
NextState = STATE_READY;
end
@ -167,12 +165,12 @@ module cachefsm
// amo hit
else if(Atomic[1] & (&RW) & CacheHit) begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY_FINISH_AMO;
if (`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
//if (`REPLAY) PreSelAdr = 2'b01;
//else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -183,8 +181,8 @@ module cachefsm
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
//if(`REPLAY) PreSelAdr = 2'b01;
//else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -192,12 +190,12 @@ module cachefsm
end
// write hit valid cached
else if (RW[0] & CacheHit) begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
//if(`REPLAY) PreSelAdr = 2'b01;
//else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -211,7 +209,7 @@ module cachefsm
end
STATE_MISS_FETCH_WDV: begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if (CacheBusAck) begin
NextState = STATE_MISS_FETCH_DONE;
@ -221,7 +219,7 @@ module cachefsm
end
STATE_MISS_FETCH_DONE: begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(VictimDirty) begin
NextState = STATE_MISS_EVICT_DIRTY;
end else begin
@ -231,12 +229,12 @@ module cachefsm
STATE_MISS_WRITE_CACHE_LINE: begin
NextState = STATE_MISS_READ_WORD;
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
//LRUWriteEn = 1'b1; // DO not update LRU on SRAM fetch update. Wait for subsequent read/write
end
STATE_MISS_READ_WORD: begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if (RW[0] & ~Atomic[1]) begin // handles stores and amo write.
NextState = STATE_MISS_WRITE_WORD;
end else begin
@ -248,10 +246,10 @@ module cachefsm
STATE_MISS_READ_WORD_DELAY: begin
if(&RW & Atomic[1]) begin // amo write
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY_FINISH_AMO;
if(~`REPLAY) save = 1'b1;
//if(~`REPLAY) save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -259,8 +257,8 @@ module cachefsm
end else begin
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
//if(`REPLAY) PreSelAdr = 2'b01;
//else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -269,11 +267,11 @@ module cachefsm
end
STATE_MISS_WRITE_WORD: begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
if(`REPLAY) PreSelAdr = 2'b01;
else save = 1'b1;
//if(`REPLAY) PreSelAdr = 2'b01;
//else save = 1'b1;
end
else begin
NextState = STATE_READY;
@ -281,7 +279,7 @@ module cachefsm
end
STATE_MISS_EVICT_DIRTY: begin
PreSelAdr = 2'b01;
//PreSelAdr = 2'b01;
if(CacheBusAck) begin
NextState = STATE_MISS_WRITE_CACHE_LINE;
end else begin
@ -291,11 +289,10 @@ module cachefsm
STATE_CPU_BUSY: begin
PreSelAdr = 2'b00;
restore = 1'b1;
//PreSelAdr = 2'b00;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY;
if(`REPLAY) PreSelAdr = 2'b01;
//if(`REPLAY) PreSelAdr = 2'b01;
end
else begin
NextState = STATE_READY;
@ -303,8 +300,7 @@ module cachefsm
end
STATE_CPU_BUSY_FINISH_AMO: begin
PreSelAdr = 2'b01;
restore = 1'b1;
//PreSelAdr = 2'b01;
if(CPUBusy) begin
NextState = STATE_CPU_BUSY_FINISH_AMO;
end
@ -315,17 +311,17 @@ module cachefsm
STATE_FLUSH: begin
// intialize flush counters
PreSelAdr = 2'b10;
//PreSelAdr = 2'b10;
NextState = STATE_FLUSH_CHECK;
end
STATE_FLUSH_CHECK: begin
PreSelAdr = 2'b10;
//PreSelAdr = 2'b10;
if(VictimDirty) begin
NextState = STATE_FLUSH_WRITE_BACK;
end else if (FlushAdrFlag & FlushWayFlag) begin
NextState = STATE_READY;
PreSelAdr = 2'b00;
//PreSelAdr = 2'b00;
end else if(FlushWayFlag) begin
NextState = STATE_FLUSH_INCR;
end else begin
@ -334,12 +330,12 @@ module cachefsm
end
STATE_FLUSH_INCR: begin
PreSelAdr = 2'b10;
//PreSelAdr = 2'b10;
NextState = STATE_FLUSH_CHECK;
end
STATE_FLUSH_WRITE_BACK: begin
PreSelAdr = 2'b10;
//PreSelAdr = 2'b10;
if(CacheBusAck) begin
NextState = STATE_FLUSH_CLEAR_DIRTY;
end else begin
@ -348,10 +344,10 @@ module cachefsm
end
STATE_FLUSH_CLEAR_DIRTY: begin
PreSelAdr = 2'b10;
//PreSelAdr = 2'b10;
if(FlushAdrFlag & FlushWayFlag) begin
NextState = STATE_READY;
PreSelAdr = 2'b00;
//PreSelAdr = 2'b00;
end else if (FlushWayFlag) begin
NextState = STATE_FLUSH_INCR;
@ -409,7 +405,30 @@ module cachefsm
assign CacheFetchLine = (CurrState == STATE_READY & (DoAMOMiss | DoWriteMiss | DoReadMiss));
assign CacheWriteLine = (CurrState == STATE_MISS_FETCH_DONE & VictimDirty) |
(CurrState == STATE_FLUSH_CHECK & VictimDirty);
assign restore = ((CurrState == STATE_CPU_BUSY) | (CurrState == STATE_CPU_BUSY_FINISH_AMO)) & ~`REPLAY;
assign save = ((CurrState == STATE_READY & (DoAMOHit | DoReadHit | DoWriteHit) & CPUBusy) |
(CurrState == STATE_MISS_READ_WORD_DELAY & (DoAMO | DoRead) & CPUBusy) |
(CurrState == STATE_MISS_WRITE_WORD & DoWrite & CPUBusy)) & ~`REPLAY;
assign PreSelAdr = ((CurrState == STATE_READY & IgnoreRequest) |
(CurrState == STATE_READY & DoAMOHit) |
(CurrState == STATE_READY & DoReadHit & (CPUBusy & `REPLAY)) |
(CurrState == STATE_READY & DoWriteHit) |
(CurrState == STATE_MISS_FETCH_WDV) |
(CurrState == STATE_MISS_FETCH_DONE) |
(CurrState == STATE_MISS_WRITE_CACHE_LINE) |
(CurrState == STATE_MISS_READ_WORD) |
(CurrState == STATE_MISS_READ_WORD_DELAY & (DoAMO | (CPUBusy & `REPLAY))) |
(CurrState == STATE_MISS_WRITE_WORD) |
(CurrState == STATE_MISS_EVICT_DIRTY) |
(CurrState == STATE_CPU_BUSY & (CPUBusy & `REPLAY)) |
(CurrState == STATE_CPU_BUSY_FINISH_AMO)) ? 2'b01 :
((CurrState == STATE_FLUSH) |
(CurrState == STATE_FLUSH_CHECK & ~(VictimDirty & FlushAdrFlag & FlushWayFlag)) |
(CurrState == STATE_FLUSH_INCR) |
(CurrState == STATE_FLUSH_WRITE_BACK) |
(CurrState == STATE_FLUSH_CLEAR_DIRTY & ~(FlushAdrFlag & FlushWayFlag))) ? 2'b10 :
2'b00;
endmodule // cachefsm