IBM PowerPC 604 User Manual page 152

Table 3-6. Cache Actions (Continued)
Cache MESI
Action
Bus Bus
TT0-4 Rsv'n
Snoop
Action
WIM State Operation WIM Response
001
s
stwcx.
Kill
001 01100 Yes (None) or Release reservation
(and
§115
update condition register
reset)
mark cache block E
store to cache
mark cache block M
001
s
stwcx. Kill 001 01100 Yes
ARTRY
or Release the bus
' A RTRV&' § R' D '
retry the operation
001 E stwcx. (None) (n/a) (n/a)
None
(n/a) Update condition register
001 ME stwcx. (None) (n/a) (n/a) Yes (n/a) Release reservation
(and
update condition register
reset) store to cache
mark cache block M
001 ME stwcx. (None) (nla) (nla) Yes (n/a)
(nla)
001 M stwcx. (None) (nla) (nla) Yes (nla) Release reservation
(and
update condition register
reset) store to cache
011 I stwcx. (None) (n/a) (n/a) None (n/a) Update condition register
010
011 I stwcx. Write with 01M 10010 Yes (None) or Release reservation
010 flush (and
mm
update condition register
atomic reset) store to
main
memory
011 I
stwcx. Write with 01M 10010 Yes ARTRVor Release the bus
010 flush
' A RTRV&' § R' D '
retry the operation
atomic
011 ME stwcx. (None) (n/a) (n/a) None (n/a)
Paradox-cache should be I
010
s
update condition register
011 ME stwcx. Write with 01M 10010 Yes (None) or
Paradox-cache should be I
010
s
flush (and
mm
checklrelease reservation
atomic reset) update condition register
store
to
main memory
011 ME stwcx. Write with 01M 10010 Yes
ARTRY
or Paradox-cache should be I
010
s
flush
Am'RV&'§R'D'
release the bus
atomic retry the operation
011
M stwcx. (n/a) (nla) (n/a) None (n/a) (nla)
010
100
(nla)
stwcx. (n/a) (n/a) (n/a)
(nla) (n/a)
A stwcx. to a page marked write-
101 though causes a data
ac:cess
11X
exception; therefore, no bus
transaction results.
Chapter 3. Cache and Bus Interface Unit Operation
3-29