PCI Express System Architecture

Sources of PCI Express Errors

This section provides a more detailed description of the error checks made by PCI Express interfaces when handling transactions.

ECRC Generation and Checking

ECRC generation and checking is optional and only supported by devices and systems that implement Advanced Error Reporting. Devices that support ECRC must implement the Advanced Error Capabilities and Control Register. Configuration software checks this register to determine if ECRC is supported, and to enable ECRC support.

A PCI Express device that originates a transaction (Request or Completion) can create and append a 32-bit CRC (within the digest field) that covers the header and data portions of the transaction. This CRC is termed end-to-end (ECRC) and ...