IBM PowerPC 604 User Manual page 154

Table 3-6. cache Actions (COntlnued)
Cache MESI
Action
Bus Bus
TT0-4
Rsv'n
Snoop
Action
WIM State Operation WIM Response
100 ME debt (None) (n/a) (n/a) (.Va) (n/a)
No-op
s
101 I debt
Read 101
01010 (.Va) (None)
Load the block of data into cache
mark the cache E
101 I debt Read 101 01010 (.Va)
~
Load the block of data into cache
mark the cache S
101
I
debt Read 101 01010 (.Va)
~or
Release the bus
~&~
retry the operation
101 ME
debt
(None) (n/a) (n/a)
(.Va)
(n/a) No-op
s
000 I debtst Read 000 01010 (.Va) (None) Load the block of data into cache
mark the cache E
000 I debtst Read 000 01010 (.Va)
~
Load the block of data into cache
mark the cache S
000
I
debtst Read 000 01010 (.Va)
~or
Release the bus
~&~
retry the operation
000
s
debtst (None) (n/a) (n/a) (.Va) (n/a) No-op
000
ME
debtst (None) 000 (n/a) (.Va) (n/a) No-op
001
I
debtst Read 001 01010 (.Va) (None) Load the block
of
data into cache
mark the cache E
001
I
debtst Read 001 01010
(.Va)
~
Load the block of data into cache
mark the cache S
001 I debtst Read 001 01010
(.Va)
ARTRY
or Release the bus
~&§m'
retry the operation
001
ME
debt st (None) (n/a) (n/a) (.Va) (.Va) No-op
s
011
I
debtst (None) 01M (n/a)
(.Va)
(.Va)
No-op
010 11M
110
111
011 ES debtst (None) (n/a) (n/a)
(.Va) (n/a) No-op
010
110
111
011 M
debtst
(None)
(n/a) (.Va) None (n/a) No-op
010
110
111
011 M debtst (.Va) (n/a) (n/a)
None
(.Va) (.Va)
010
110
111
Chapter 3. Cache and Bus Interface Unit Operation 3-31