Service manual

B-30 AlphaServer GS80/160/320 Service Manual
B.10.4 Global (Remote) Read Transactions
Figure B– 9 Global (Remote) Read Transaction Storage Flow
Q0: Visit TTT
via GPLink
Q0
Q0Vic
Q1
Q1
Response
Packet
Q1
Probe
Packet
(Fwd Rd)
Q2
Dirty
Data
Q1: Visit TTT, and
Dtag or IOP
Tag store, via
ArbBus.
Q2: Visit Dtag, and
TTT or IOP
Tag store via
ArbBus.
Source QBB
Q0: Visit Directrory
Dtag, TTT and
IOP Tag store
via ArbBus.
Home QBB
Q1: Directory steers
Fwd Rd directly
to Dirty Processor.
QBB of Dirty Processor