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IDT Theory of Operation
Notes
PES48H12G2 User Manual
3.
A DL protocol error occurs when an ACK or NAK DLLP is received and the sequence number specified by AckNak_Seq does not
correspond to an unacknowledged TLP or to the value in ACKD_SEQ
Transaction Layer Errors
Table 9.9 lists non-ACS error checks associated with a PCI-to-PCI bridge function and the action taken
when an error is detected. ACS error checks and handling are discussed in section ACS Error Handling on
page 9-12. Per the PCI Express 2.0 specification, transaction layer errors are ignored in cases where the
error is associated with a received packet for which the physical or data-link layers report an error. This
prevents error pollution. Refer to section Transaction Layer Error Pollution on page 9-13 for details on
transaction layer error pollution.
9 - 8
April 5, 2013
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