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Fixed the 4 way set associative pseudo LRU replacement policy.

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This commit is contained in:
Ross Thompson 2021-10-29 12:46:02 -05:00
parent f61fcd25a9
commit 8aad95366d
1 changed files with 9 additions and 1 deletions
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10
wally-pipelined/src/cache/cachereplacementpolicy.sv vendored
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@ -59,7 +59,7 @@ module cachereplacementpolicy
ReplacementBits[index] <= '0; ReplacementBits[index] <= '0;
end else begin end else begin
RAdrD <= RAdr; RAdrD <= RAdr;
MemPAdrMD <= MemPAdrMD; MemPAdrMD <= MemPAdrM;
LRUWriteEnD <= LRUWriteEn; LRUWriteEnD <= LRUWriteEn;
NewReplacementD <= NewReplacement; NewReplacementD <= NewReplacement;
if (LRUWriteEnD) begin if (LRUWriteEnD) begin
@ -91,6 +91,14 @@ module cachereplacementpolicy
//assign VictimWay[1] = BlockReplacementBits[2]; //assign VictimWay[1] = BlockReplacementBits[2];
// 1 hot encoding // 1 hot encoding
//| WayHit | LRU 2 | LRU 1 | LRU 0 |
//|--------+-------+-------+-------|
//| 0000 | - | - | - |
//| 0001 | 1 | - | 1 |
//| 0010 | 1 | - | 0 |
//| 0100 | 0 | 1 | - |
//| 1000 | 0 | 0 | - |
assign VictimWay[0] = ~BlockReplacementBits[2] & ~BlockReplacementBits[0]; assign VictimWay[0] = ~BlockReplacementBits[2] & ~BlockReplacementBits[0];
assign VictimWay[1] = ~BlockReplacementBits[2] & BlockReplacementBits[0]; assign VictimWay[1] = ~BlockReplacementBits[2] & BlockReplacementBits[0];
assign VictimWay[2] = BlockReplacementBits[2] & ~BlockReplacementBits[1]; assign VictimWay[2] = BlockReplacementBits[2] & ~BlockReplacementBits[1];