Compaq 21264 Hardware Reference Manual page 110

System Port
Table 4–14 21264/EV67-to-System Commands Descriptions (Continued)
Command
Command [4:0]
ReadBlkMod 10001
ReadBlkI 10010
FetchBlk 10011
2
ReadBlkSpec 10100
2
ReadBlkModSpec 10101
2
ReadBlkSpecI 10110
2
FetchBlkSpec 10111
3
ReadBlkVic 11000
3
ReadBlkModVic 11001
3
ReadBlkVicI 11010
WrVictimBlk 00100
CleanVictimBlk 00101
4
Evict 00110
ReadBytes 01000
ReadLWs 01001
ReadQWs 01010
WrBytes 01100
WrLWs 01101
WrQWs 01110
6
CleanToDirty 11100
6
SharedToDirty 11101
6
STCChangeToDirty 11110
3,5
InvalToDirtyVic 11011
5
InvalToDirty 11111
Cache and External Interfaces
4–22
Function
Memory read with modify intent.
Memory read for Istream.
Noncached memory read.
Speculative memory read (optional).
Speculative memory read with modify intent (optional).
Memory read for Istream (optional).
Speculative memory noncached ReadBlk (optional).
Memory read with a victim (optional).
Memory read with modify intent, with a victim (optional).
Memory read for Istream with a victim (optional).
Write-back of dirty block.
Address of a clean victim (optional).
Invalidate evicted block at the given Bcache index (optional).
I/O read, byte mask.
I/O read, longword mask.
I/O read, quadword mask.
I/O write, byte mask.
I/O write, longword mask.
I/O write, quadword mask.
Sets a block dirty that was previously clean (optional for duplicate tags).
Sets a block dirty that was previously shared (optional for multiprocessor
systems).
Sets a block dirty that was previously clean or shared for a STx_C
instruction (optional for multiprocessor systems).
Invalid to dirty with a victim (optional).
WH64 Acts like a ReadBlkMod without the fill cycles (optional).
Alpha 21264/EV67 Hardware Reference Manual