PCI Express Base Specification v1.0 - 2002.pdf

PCI EXPRESS BASE SPECIFICATION, REV. 1.0System DFT mechanism(s):• Loop-back mode1.5.4.4. Inter-Layer Interfaces1.5.4.4.1. Transaction/Data Link InterfaceThe Transaction to Data Link interface provides:• Byte or multi-byte data to be sent across the Linko Local TLP-transfer handshake mechanismo TLP boundary information• Requested power state for the LinkThe Data Link to Transaction interface provides:• Byte or multi-byte data received from the PCI Express Link• TLP framing information for the received byte• Actual power state for the Link• Link status information1.5.4.4.2. Data Link/Physical InterfaceThe Data Link to Physical interface provides:• Byte or multi-byte wide data to be sent across the Linko Data transfer handshake mechanismo TLP and DLLP boundary information for bytes• Requested power state for the LinkThe Physical to Data Link interface provides:• Byte or multi-byte wide data received from the PCI Express Link• TLP and DLLP framing information for data• Indication of errors detected by the Physical Layer• Actual power state for the Link• Connection status information40