IBM PowerPC 604 User Manual page 156

Table 3-6. Cache Actions (Continued)
Cache MESI
Action
Bus Bus
TT0-4 Rsv'n
Snoop
Action
WIM State
Operation WIM Response
001 E dcbz (None) (n/a) (n/a) (nla)
(nla) Write zeros to all bytes in the
Cache block
mark cache block M
001 M dcbz (None) (n/a) (n/a) (nla) (n/a) Write zeros to all bytes in the
cache block
010 ME dcbz (n/a) (n/a) (n/a) (nla) (n/a) A dcbz to a page marked cache
011 SI inhbited or write-through causes
110 an alignment exception;
111 therefore this transaction does
100
not
occur on the bus
101
000 ESI dcbst Clean
000 00000
(nla) (None) or No-op
~
000 ESI dcbst Clean 000 00000 (nla) JJITFIVor Release the bus
JJITFIV&~
retry the operation
000 M
dcbst
Write with 100
00110 (nla) (None) or Write the block to main memory
kill
~
mark cache block E
000 M dcbst Write with 100 00110
(nla) JJITFIVor Release the bus
kill
JJITFIV&~
retry the operation
001 ESI deb st Clean 001 00000 (nla) (None) or No-op
~
001 ESI deb st Clean 001 00000
(nla) ARTRY or Release the bus
JJITFIV&~
retry the operation
001 M dcbst Write with 100 00110
(nla)
(None) or
Write all bytes in the cache block
kill
~
to main memory
mark cache block E
001 M dcbst Write with 100 00110
(nla) ARTRVor Release the bus
kill
ARTRV&~
retry the operation
011 ESI
dcbst Clean W1M 00000 (nla) (None) or No-op
010
~
110
111
011 I
dcbst Clean W1M 00000 (nla) ARTRVor Release the bus
010
ARTRV&~
retry the operation
110
111
011 M dcbst Write with 100 00110
(nla) (None) or Write all bytes in the cache block
010
kill
~
to main memory
110 Mark cache block E
111
011 M deb st Write with 100 00110
(nla)
ARTRVor Release the bus
010
kill
ARTRV&~
retry the operation
110
111
Chapter 3. Cache and Bus Interface Unit Operation
3-33