IBM PowerPC 604 User Manual page 147

Table 3-6. Cache Actions
Cache MESI
Action
Bus Bus
TT0-4
Rsv'n
Snoop
Action
WIM State Operation WIM Response
000
I Load Read 000
01010 (nla) (None) Load the block
of
data into cache
forward data from load
mark cache block E
000 I Load Read 000
01010 (nla)
~
Load the block of data into cache
load from cache
mark cache block S
000 I Load
Read 000
01010 (nla) 7'FITRYor Release the bus
XRTRV&!RD retry the operation
000 ME Load (None) (rVa)
(n/a) (nla)
(n/a) Load from cache
s
001 I Load Read 001 01010 (nla) (None) Load the block
of
data into cache
mark cache block E
load from cache
001 I Load Read 001 01010 (nla) !RD Load the block
of
data into cache
load from cache
mark cache block S
001 I Load
Read 001
01010 (nla) XRTRVor
Release the bus
7'RTRV&§Hl
retry the operation
001 ME Load (None) (n/a) (n/a) (nla) (n/a) Load from cache
s
011 ESI
Load Single- 01M
01010 (nla)
(None) or Load from main memory
010 beat read 11M
~
110
111
011 ESI
Load
Single-
01M
01010 (nla)
XRTRVor Release the bus
010
beat read 11M
7'R'm'f&§Hl
retry the operation
110
111
011 M Load Single-
01M
01010 (nla)
(None) or Paradox--<:ache should be I
010
beat read 11M !RD
load from main memory
110
111
011 M Load
Single- 01M
01010
(nla) 7'RTRVor Paradox--<:ache should be I
010
beat read 11M 'JJ!ITRV&§m'
release the bus
110
retry the operation
111
100
I Load Read 100 01010 (nla)
(None) Load the block
of
data into cache
load from cache
mark the cache block E
100 I Load
Read 100 01010 (nla)
~
Load the block
of
data into cache
load from cache
mark cache block S
3-24
PowerPC 604 RISC Microprocessor User's Manual