Requester Completion Interface Operation (512-bit) - 1.0 English

Versal Adaptive SoC Integrated Block for PCI Express LogiCORE IP Product Guide (PG343)

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Figure 1. Requester Completion Interface Signals

The previous figure illustrates the signals associated with the requester completion interface of the core. When straddle is not enabled, the core delivers each TLP on this interface as an AXI4-Stream packet. The packet starts with a 96-bit descriptor, followed by data in the case of Completions with a payload.

The requester completion interface supports two distinct data alignment modes for transferring payloads, which are during core customization in the AMD Vivado™ IDE. In the Dword-aligned mode, the core transfers the first Dword of the Completion payload immediately after the last Dword of the descriptor. In the 128-bit address aligned mode, the core starts the payload transfer in the second 128-bit quarter of the 512-bit word, following the descriptor in the first quarter. The first Dword of the payload can be in any of the four possible Dword positions in the second quarter, and its offset f the is determined by address offset provided by the user logic when it sent the request to the core (that is, the setting of the addr_offset input of the requester request interface). Thus, the 128-bit address aligned mode can be used on the requester completion interface only if the requester request interface is also configured to use the 128-bit address aligned mode.