82870P2P64H2 Datasheet, PDF (159/217 Pages) –

Functional Description
R
4.5.4.3
Hub Interface Action on Immediate Responses to PCI-X Split
Completions
Table 53 indicates what the P64H2 does if it is returning a split completion to PCI-X form a
normal hub interface completion and receives an immediate response indicating some kind of
error.
Table 53. Hub Interface Response to PCI-X Split Completion Terminations of Completion
Required Cycles
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 SO_SERR cycle and setting of the Signaled System Error bit only occur if the SERR# Enabled in
the PCI Primary Device Command Register is set.
4.5.4.4 Behavior of PCI/PCI-X Initiated Cycles to Hub Interface
Table 54. Terminations of Completion Required 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 Abort¹
Split Master Abort²
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
returned successfully from the hub interface, and have not yet been sent back on PCI-X, when the abort
is detected on the hub interface the P64H2 will stop the current sequence for that data (if it was
running), and generate the Split Completion Error Message.
Intel^® 82870P2 P64H2 Datasheet
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