IBM PowerPC 604 User Manual page 155

Table 3-6. Cache Actions (Continued)
Cache MESI
Action
Bus Bus
TT0-4
Rsv'n
Snoop
Action
WIM State Operation WIM
Response
100
I dcbtst Read
100 01010 (n/a) (None) Load the block of data into cache
markcache E
100
I dcbtst Read
100 01010 (n/a)
§R15
Load the block of data into cache
mark cache as block S
100 I dcbtst Read 100
01010
(n/a) AATRVor Release the bus
AATRV&§R15
retry the operation
100
ME dcbtst (None) (n/a)
(n/a) (n/a)
(n/a)
No-op
s
101 I dcbtst Read 101
01010
(n/a) (None) Load the block of data into cache
mark cache block E
101 I dcbtst Read 101
01010
(n/a)
§R15
Load the block of data into cache
mark cache block S
101 I dcbtst Read 101
01010
(n/a) AATRVor Release the bus
AATRV&§R15
retry the operation
101
s
dcbtst (None) (n/a) (n/a) (n/a) (n/a) No-op
E
101
M dcbtst (None) (n/a) (n/a) (n/a) (n/a) No-op
000
I
dcbz
Kill
000
01100
(n/a) (None) or Establish the block in data cache
SRl5
without fetching the block from
main memory
clear all bytes
mark cache block M
000
SI
dcbz
Kill
000 01100 (n/a)
AATRVor Release the bus
AATRV&§R15
retry the operation
000
s
dcbz
Kill
000
01100
(n/a) (None) or Clear ail bytes in the block
§R15
mark cache block M
000
E
dcbz
(None)
000
(n/a) (n/a) (n/a) Clear ail bytes in the block
mark cache block M
000
M dcbz (None) (n/a) (n/a) (n/a)
(n/a) Write zeros to ail bytes in the
cache block
001
I
dcbz
Kill
001 01100
(n/a) (None) or Establish the block in data cache
§R15
without fetching the block from
main memory
clear au bytes
mark cache block M
001
I dcbz Kill 001
01100
(n/a) AATRVor Release the bus
Am'RY&§R15
retry the operation
001
s
dcbz Kill 001 01100 (n/a) (None) or
Mark cache block E
SRl5
set all bytes of the block to zero
mark the cache block M
001
s
dcbz
Kill
001 01100
(n/a) AATRVor Release the bus
Am'RY&§R15
Retry the operation
3-32
PowerPC 604 RISC Microprocessor User's Manual