82870P2P64H2 Datasheet, PDF (133/217 Pages) –

Functional Description
R
4.2.15.3
Hub Interface Action on Immediate Responses to PCI-X Split
Completions
Table 35 indicates what the P64H2 will do if it is returning a split completion to PCI-X from a
normal hub interface completion and receives an immediate response indicating an error. Table 36
indicates the behavior of PCI/PCI-X Initiated Cycles to Hub Interface.
Table 35. Response to PCI-X Split Completions
Split Completion
Termination
Hub Interface Cycle
Status Register Bits
Successful
Master Abort
Target Abort
None
DO_SERR ¹
DO_SERR ¹
• None
• Received Master Abort (Sec)
• Split Completion Discarded (Sec)
• Signaled System Error (Pri) ¹
• Received Target Abort (Sec)
• Split Completion Discarded (Sec)
• Signaled System Error (Pri) ¹
NOTES:
1. The DO_SERR cycle and setting of the Signaled System Error bit only occur if the SERR# enabled in
the Primary Command Register is set.
Table 36. Terminations of Completion Requited Cycles to Hub Interface
Hub Interface Termination
PCI Completion
Status Register Bits Set
Successful
Master Abort (PCI)
Master Abort (PCI-X)
Target Abort
Master and Target Abort
Successful
Target Abort ¹
Split Master Abort ²
Target Abort (PCI) ¹
Split Target Abort (PCI-X) ²
Target Abort (PCI) ¹
Split Target Abort (PCI-X) ²
• None
• Received Master Abort (Pri)
• Signaled Target Abort (Sec)
• Received Master Abort (Pri)
• Received Target Abort (Pri)
• Signaled Target Abort (Sec)
• Received Master Abort (Pri)
• Received Target Abort (Pri)
• Signaled Target Abort (Sec)
NOTES:
1. The P64H2 will only signal Target Abort if the error has been logged from the hub interface before the
initial connect by PCI or when the PCI master reconnects after a previous disconnect. If the P64H2
receives an abort on the hub interface in the middle of a read completion stream, it will not interrupt the
stream to signal Target Abort.
2. The P64H2 will issue a Split Completion Error Message with either Master Abort or Target Abort for the
remaining completion sequence if an abort is detected on the hub interface. If several bytes of data are
returned successfully from the hub interface and have not yet been sent back on PCI-X, when the abort
Intel^® 82870P2 P64H2 Datasheet
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