Managing Receive-Buffer Space for Inbound Completions - 3.4 English

Versal Adaptive SoC CPM Mode for PCI Express Product Guide (PG346)

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3.4 English

The PCI® Express Base Specification requires all Endpoints to advertise infinite Flow Control credits for received Completions to their link partners. This means that an Endpoint must only transmit Non-Posted Requests for which it has space to accept Completion responses. This appendix describes how a user application can manage the receive-buffer space in the CPM4/5 integrated block for PCIe core to fulfill this requirement.