Service manual

B-26 AlphaServer GS80/160/320 Service Manual
B.10.2 Local Read Modify Transactions
Figure B– 7 Local Read/Modify Transaction
Q0: Visit Directrory
Dtag, TTT and
IOP Tag store
via ArbBus.
Q1
Probe
Packet
(Fwd Rd or Inval)
Q2
Dirty
Data
Q1
Probe
Packet
(Inval)
Q2: Visit TTT
via
ArbBus
Source/Home QBB
Q1: Visit Dtag, TTT and
IOP Tag store
via ArbBus.
QBB of Shared Processor
Q1: Directory steers Fwd
Rd directly to Dirty
Processor.
Visit TTT, Dtag and
IOP Tag Store via
ArbBus
QBB of Dirty Processor
Q1
Q1
Response
Packet
Q2: Fill steered
directly to
requesting
processor.