Service manual

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6.16
AC Input Box Removal and Replacement........................................... 6-36
Appendix A Power Distribution Rules
A.1 GS160/320 Power Cabinet Configuration and Cabling.........................A-2
A.2 Expander Cabinet Configuration and Cabling .....................................A-8
A.3 GS80 Power Cabling ...........................................................................A-16
Appendix B Cache Coherency
B.1 Terminology ..........................................................................................B-2
B.2 Cache States..........................................................................................B-3
B.3 Cache Commands..................................................................................B-4
B.3.1 Memory Space Commands..............................................................B-4
B.3.2 System Probe Commands ...............................................................B-6
B.4 Cache State Transition Diagram ..........................................................B-7
B.5 Commands and Cache State Interaction ..............................................B-7
B.6 Virtual Channels...................................................................................B-9
B.7 Virtual Channels and Coherency Flow...............................................B-10
B.7.1 Memory Space Transactions.........................................................B-10
B.7.2 I/O Space Reads............................................................................B-12
B.7.3 I/O Space Writes...........................................................................B-14
B.8 Virtual Channel Ordering Rules.........................................................B-15
B.9 Coherency Data Storage......................................................................B-18
B.9.1 CPU Primary Tag Store (PTag)....................................................B-18
B.9.2 IOP Tag Store ...............................................................................B-19
B.9.3 QBB Duplicate Tag Store (DTag) .................................................B-20
B.9.4 QBB Directory...............................................................................B-21
B.9.5 TTT Storage..................................................................................B-21
B.9.6 Access to Coherency State ............................................................B-22
B.10 Coherency Storage and Coherency Flow.............................................B-24
B.10.1 Local Read Transactions...............................................................B-24
B.10.2 Local Read Modify Transactions...................................................B-26
B.10.3 Local Change-to-Dirty, Inval-to-Dirty and Full Block
Transactions .................................................................................B-28
B.10.4 Global (Remote) Read Transactions..............................................B-30
B.10.5 Global (Remote) Read Modify Transactions..................................B-32
B.10.6 Global (Remote) Change-to-Dirty Transactions ...........................B-34
B.10.7 Global (Remote) Inval-to-Dirty and Full Block Write
Transactions .................................................................................B-36