Altera Arria V GZ Avalon-ST - Manual (Page 235)

Verilog HDL include file altpcietb_bfm_driver_rp.v. The complete list of available procedures and
functions is as follows:
•
ebfm_barwr
—writes data from BFM shared memory to an offset from a specific Endpoint BAR. This
procedure returns as soon as the request has been passed to the VC interface module for transmission.
•
ebfm_barwr_imm
—writes a maximum of four bytes of immediate data (passed in a procedure call) to
an offset from a specific Endpoint BAR. This procedure returns as soon as the request has been passed
to the VC interface module for transmission.
•
ebfm_barrd_wait
—reads data from an offset of a specific Endpoint BAR and stores it in BFM shared
memory. This procedure blocks waiting for the completion data to be returned before returning
control to the caller.
•
ebfm_barrd_nowt
—reads data from an offset of a specific Endpoint BAR and stores it in the BFM
shared memory. This procedure returns as soon as the request has been passed to the VC interface
module for transmission, allowing subsequent reads to be issued in the interim.
These routines take as parameters a BAR number to access the memory space and the BFM shared
memory address of the
bar_table
data structure that was set up by the
ebfm_cfg_rp_ep
procedure.
(Refer to Configuration of Root Port and Endpoint.) Using these parameters simplifies the BFM test driver
routines that access an offset from a specific BAR and eliminates calculating the addresses assigned to the
specified BAR.
The Root Port BFM does not support accesses to Endpoint I/O space BARs.
Related Information
Configuration of Root Port and Endpoint on page 17-25
BFM Procedures and Functions
The BFM includes procedures, functions, and tasks to drive Endpoint application testing. It also includes
procedures to run the chaining DMA design example.
The BFM read and write procedures read and write data among BFM shared memory, Endpoint BARs,
and specified configuration registers. The procedures and functions are available in the Verilog HDL.
They are in the include file altpcietb_bfm_driver.v. These procedures and functions support issuing
memory and configuration transactions on the PCI Express link.
ebfm_barwr Procedure
The
ebfm_barwr
procedure writes a block of data from BFM shared memory to an offset from the
specified Endpoint BAR. The length can be longer than the configured
MAXIMUM_PAYLOAD_SIZE
; the
procedure breaks the request up into multiple transactions as needed. This routine returns as soon as the
last transaction has been accepted by the VC interface module.
Location altpcietb_bfm_rdwr.v
Syntax
ebfm_barwr(bar_table, bar_num, pcie_offset, lcladdr, byte_len, tclass)
UG-01127_avst
2014.12.15
BFM Procedures and Functions 17-31
Testbench and Design Example Altera Corporation
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