User guide

Chapter 17: Testbench and Design Example 17–29
BFM Procedures and Functions
December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
ebfm_barwr_imm Procedure
The ebfm_barwr_imm procedure writes up to four bytes of data to an offset from the
specified Endpoint BAR.
byte_len
Length, in bytes, of the data written. Can be 1 to the minimum of the bytes remaining in
the BAR space or BFM shared memory.
tclass Traffic class used for the PCI Express transaction.
Table 17–20. ebfm_barwr Procedure (Part 2 of 2)
Table 17–21. ebfm_barwr_imm Procedure
Location altpcietb_bfm_driver_rp.v
Syntax
ebfm_barwr_imm(bar_table, bar_num, pcie_offset, imm_data, byte_len, tclass)
Arguments bar_table
Address of the Endpoint bar_table structure in BFM shared memory. The bar_table
structure stores the address assigned to each BAR so that the driver code does not need
to be aware of the actual assigned addresses only the Application Layer specific offsets
from the BAR.
bar_num Number of the BAR used with pcie_offset to determine PCI Express address.
pcie_offset Address offset from the BAR base.
imm_data
Data to be written. In Verilog HDL, this argument is reg [31:0] .In both languages, the
bits written depend on the length as follows:
Length Bits Written
4 31 downto 0
3 23 downto 0
2 15 downto 0
1 7 downto 0
byte_len Length of the data to be written in bytes. Maximum length is 4 bytes.
tclass Traffic class to be used for the PCI Express transaction.