L- and H-Tile Avalon® Streaming and Single Root I/O Virtualization (SR-IOV) Intel® FPGA IP for PCI Express* User Guide

ID 683111
Date 4/23/2024
Document Table of Contents

6.5.1. Retry Buffer

The retry buffer stores a copy of a transmitted TLP until the remote device acknowledges the TLP using the ACK mechanism. In the case of an LCRC error on the receiving side, the remote device sends NAK DLLP to the transmitting side. The transmitting side retrieves the TLP from the retry buffer and resends it.

Retry buffer resources are only freed upon reception of an ACK DLLP.