IBM PowerPC 604 User Manual page 164

Table 3-6. C&che Actions (Continued)
Cache MESI
Action
Bus Bus
TI0-4
RsV'n
Snoop
Action
WIM State Operation WIM
Response
s
Snoop- xx1 00010 Yes (None)
Mark cache block I.
write with (and
Release reservation.
flush
reset)
E Snoop- xx1 00010 None (None) Paradox-no one else should
be
write with writing if this cache is E.
flush Mark cache block I
E
Snoop-
xx1 00010 Yes (None) Paradox-no one else should
be
write with (and writing if this cache ls E.
flush reset)
Mark cache block I.
Release reservation.
M Snoop- xx1 00010 None Am'FN&§m Paradox-no one else should
be
write with
writing ii this cache is M.
flush Attempt to write cache block
back to main memory;
ii successful, mark cache block I
M Snoop- xx1 00010 Yes Am'FN&§m Paradox-no one else should
be
write with (and writing if this cache ls M.
flush
reset) Attempt to write cache block
back to main memory;
if successful, mark cache block I,
release reservation
I Snoop- xx1 00110
None (None)
No-op
write with
kill
I
Snoop-
xx1 00110
Yes (None) Release reservation.
write with
(and
kill reset)
s
Snoop- xx1 00110 None (None) Mark cache block I.
write with
kill
s
Snoop-
xx1 00110 Yes (None) Mark cache block I.
write with
(and
Release reservation.
kill reset)
E Snoop- xx1 00110
None (None) Paradox-no one else should
be
write with
writing if this cache is E.
kill
Mark cache block I.
E
Snoop- xx1 00110 Yes
(None)
Paradox-no one else should be
write with
(and
writing if this cache is E.
kill
reset) Mark
cache block I.
Release reservation.
M Snoop- xx1
00110 None (None) Paradox-no one else should
be
write with writing ii this cache ls M.
kill
Mark cache block I.
Chapter 3.
Cache
and Bus Interface Unit Operation
3-41