Interconnect Packet Formats - Sun Microsystems UltraSPARC-I User Manual

raSPARC User's Manual
16.12 ReadToOwn Dirty Victimized Block
Condition: Store hit by another processor (P2).
The following transaction sequence is the same as for Section 7.16.5, "Read-
ToOwn Block," except that P2 already has the block in the Shared state (store hit),
and P1 has the victimized block in the Owned state (due to the previous Read-
ToShare request from P2).
Table 7-36 Copyback-Invalidate Dirty Victimized Block in Owned State
Processor 1
ial victim state:
g1{O}
ial missed state:
g2{I}
copies the victimized block into the
teback buffer}
RDS_REQ to System
VP bit set)
reads data
dates Etag2{I E}
SACKD to System
WRB_REQ to System serviced now
clears writeback buffer tag

17 Interconnect Packet Formats

This section specifies the packet formats for the Interconnect transaction set. The
transaction request packets are carried over SYSADDR.
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System
S_RBU reply to P1
S_INV_REQ to P1
S_OAK reply to P2
(no data transfer)
S_WBCAN reply to P1
Processor 2
Initial state:
Etag1{S}
Initial state:
Etag2{I}
P_RDO_REQ to System for
victim block in P1.
P2 updates Etag1{S M}
Processor 3
Initial state:
Etag2{I}