IBM PowerPC 604 User Manual page 153

Table 3-6. cache Actions (Continued)
Cache MESI
Action
Bus Bus
TT0-4 Rsv'n
Snoop
Action
WIM State Operation WIM Response
100 (!Va) stwcx. (n/a) (n/a)
(n/a)
Yes
(n/a) An stwcx. to a page marked
101
write-though causes a data
11X access exception; therefore, no
bus transaction results.
000 I debt Read 000
01010 (!Va) (None) Load the block of data into cache
mark the cache E
-
000 I debt Read 000 01010 (!Va)
'§m
Load the block
of
data into cache
mark the cache S
000 I debt Read 000 01010
(nla)
1J=!TRYor Release the bus
ARTl!i'Y&'§m"
retry the operation
000
ME
debt
(None)
(n/a) (n/a) (n/a)
(n/a)
No-op
s
001
I
debt Read 001 01010 (n/a) (None) Load the block of data into cache
mark the cache E
001
I
debt Read 001 01010 (nla)
'§m
Load the block of data into cache
mark the cache S
001
I debt Read 001 01010
(nla)
1J=ITRYor Release the bus
1J=ITRY&'§m"
retry the operation
001 ME debt (None) (n/a) (n/a) (n/a) (n/a) No-op
s
011
I
debt (None) 01M (n/a) (n/a)
(n/a)
No-op
010
11M
110
111
011 ES debt
(None) (n/a) (n/a)
(nla)
(n/a) No-op
010
110
111
011 M debt
(None)
(n/a) (n/a) None
(n/a)
No-op
010
110
111
011 M debt (n/a) (n/a) (n/a) None
(n/a) (!Va)
010
110
111
100
I debt Read 100 01010 (nla) (None)
Load the block
of
data into cache
mark the cache E
100
I debt Read 100 01010 (n/a)
'§ii)
Load the block of data into cache
mark the cache S
100
I
debt Read
100 01010 (n/a) 1J=ITRYor Release the bus
1J=ITRY&'§m
retry the operation
3-30
PowerPC 604 RISC Microprocessor User's Manual