L-tile and H-tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* User Guide

ID 683667
Date 11/11/2021
Document Table of Contents Enabling the PCIe* Link Inspector

You enable the PCIe* Link Inspector on the Configuration Debug and Extension Options tab of the parameter editor. You must also turn on the following parameters to use the PCIe* Link Inspector:

  • Enable transceiver dynamic reconfiguration
  • Enable dynamic reconfiguration of PCIe read-only registers
  • Enable Native PHY, LCPLL, and fPLL ADME for Transceiver Toolkit

To have access to the low-level link status information such as the information from the LTSSM, XCVR, and PLLs using the PCIe* Link Inspector from the top level of the PCIe IP, you can enable the Enable PCIe Link Inspector AVMM Interface option. This allows you to extract the information from the pli_avmm_* ports for link-level debugging without JTAG access. This optional debug capability requires you to build custom logic to read and write data from the PCIe* Link Inspector.

Note: The IP GUI only exposes the Enable PCIe Link Inspector AVMM Interface option if you enable the Enable PCIe Link Inspector option.
Table 78.  PCIe Link Inspector Avalon® -MM Interface Ports
Signal Name Direction Description
pli_avmm_master_clk Input Clock for the Avalon® -MM defined interface
pli_avmm_master_reset Input Active-low Avalon® -MM reset
pli_avmm_master_write Input Write signal
pli_avmm_master_read Input Read signal
pli_avmm_master_address[19:0] Input 20-bit address
pli_avmm_master_writedata[31:0] Input 32-bit write data
pli_avmm_master_waitrequest Output When asserted, this signal indicates that the IP core is not ready to respond to a request.
pli_avmm_master_readdatavalid Output When asserted, this signal indicates that the data on pli_avmm_master_readdata[31:0] is valid.
pli_avmm_master_readdata[31:0] Output 32-bit read data
Figure 78. Enable the Link Inspector in the Intel L-/H-Tile Avalon-MM for PCI Express IP

By default, all of these parameters are disabled.

For the design example generation, a JTAG-to- Avalon® Bridge instantiation is connected to the exported pli_avmm_* ports, so that you can read all the link information via JTAG. The JTAG-to- Avalon® Bridge instantiation is to verify the pli_avmm_* ports through JTAG. Without the design example generation, the JTAG-to- Avalon® Bridge instantiation is not present.

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