Intel® Arria® 10 Avalon® Streaming with SR-IOV IP for PCIe* User Guide

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ID 683686
Date 1/11/2022
Public
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5.4. BAR Hit Signals

The IP core contains logic that determines which BAR corresponds to a particular TLP for the following types of transactions: memory reads, memory writes and Atomic Ops. This information is sent out via the rx_st_bar_range[2:0] outputs. User application logic can leverage this information to know what BAR the transactions going across the Avalon-ST RX interface are targeting.

Signal Direction Description
rx_st_bar_range[2:0] output

These outputs identify the matching BAR for the TLP on the Avalon-ST RX interface. They are valid for MRd, MWr and Atomic Op TLPs . These outputs should be ignored for all other TLPs. They are valid in the first cycle of a TLP, when rx_st_valid and rx_st_sop are asserted. The following BAR numbers are defined:

  • 0: BAR0 when configured as 32-bit BAR or BAR0-1 when configured as 64-bit BAR
  • 1: BAR1 when configured as 32-bit BAR; reserved when BAR1 combined with BAR0 to form a 64-bit BAR
  • 2: BAR2 when configured as 32-bit BAR or BAR 2-3 when configured as 64-bit BAR
  • 3: BAR3 when configured as 32-bit BAR; reserved when BAR2 combined with BAR3 to form a 64-bit BAR
  • 4: BAR4 when configured as 32-bit BAR, or BAR4-5 when configured as 64-bit BAR
  • 5: BAR5 when configured as 32-bit BAR; reserved when BAR4 combined with BAR5 to form a 64-bit BAR
  • 6–7: Reserved
When rx_st_vf_active is deasserted, the BAR number represents a PF BAR. When rx_st_vf_activeis asserted, the BAR number represents a VF BAR.
rx_st_pf_num[2:0] output

Identifies the Function targeted by the TLP on the Avalon-ST RX interface. This output is valid for memory requests, Completions, and messages routed by ID.

When the targeted Function is a VF, this output provides the PF Number to which the VF is attached.
rx_st_vf_active output Indicates that the Function targeted by the TLP is a Virtual Function. When this output is asserted, the VF number offset of the VF is provided on rx_st_vf_num. This output is valid for memory requests, Completions, and messages routed by ID.
rx_st_vf_num[11:0] output When rx_st_vf_active is high, this output identifies the VF number offset of the VF targeted by the TLP on the Avalon-ST RX interface. This output is valid for memory requests, Completions, and messages routed by ID. Its value ranges from 0-(<n>-1), where <n> is the number of VFs associated with a PF.

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