Root Port BAR - 3.3 English

Versal ACAP CPM DMA and Bridge Mode for PCI Express Product Guide (PG347)

Document ID
PG347
Release Date
2022-11-02
Version
3.3 English

Root Port BAR does not support packet filtering (all TLPs received from PCIe link are forwarded to the user logic), however Address Translation can be configured to enable or disable, depending on the IP configuration.

During core customization in the Vivado® Design Suite, when there is no BAR enabled, RP passes all received packets to the user application without address translation or address filtering.

When BAR is enabled, by default the BAR address starts at 0x0000_0000 unless programmed separately. Any packet received from the PCIe® link that hits a BAR is translated according to the PCIE-to-AXI Address Translation rules.

Note: The IP must not receive any TLPs outside of the PCIe BAR range from the PCIe link when RP BAR is enabled. If this rule cannot be enforced, it's recommended that the PCIe BAR is disabled and do address filtering and/or translation outside of the IP.

The Root Port BAR customization options in the Vivado Design Suite are found in the PCIe BARs Tab.