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

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ID 683667
Date 11/11/2021
Public
Document Table of Contents

10.5.4. ebfm_barrd_nowt Procedure

The ebfm_barrd_nowt procedure reads a block of data from the offset of the specified Endpoint BAR and stores the data in BFM shared memory. The length can be longer than the configured maximum read request size; the procedure breaks the request up into multiple transactions as needed. This routine returns as soon as the last read transaction has been accepted by the VC interface module, allowing subsequent reads to be issued immediately.

Location

altpcietb_g3bfm_rdwr.v

Syntax

ebfm_barrd_nowt(bar_table, bar_num, pcie_offset, lcladdr, byte_len, tclass)

Arguments

bar_table

Address of the Endpoint bar_table structure in BFM shared memory.

bar_num

Number of the BAR used with pcie_offset to determine PCI Express address.

pcie_offset

Address offset from the BAR base.

lcladdr

BFM shared memory address where the read data is stored.

byte_len

Length, in bytes, of the data to be read. Can be 1 to the minimum of the bytes remaining in the BAR space or BFM shared memory.

tclass

Traffic Class to be used for the PCI Express transaction.

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