AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE User's Guide download pdf (Page 242)

17–20 Chapter 17: Testbench and Design Example

Root Port BFM

Cyclone V Hard IP for PCI Express December 2013 Altera Corporation

User Guide

■ altpcietb_bfm_vc_intf_ast.v—a wrapper module which instantiates either

altpcietb_vc_intf_64 or altpcietb_vc_intf_<application_width> based on the type of

Avalon-ST interface that is generated.

■ altpcietb_vc_intf__<application_width>.v—provide the interface between the

Cyclone V Hard IP for PCI Express variant and the Root Port BFM tasks. They

provide the same function as the altpcietb_bfm_vc_intf.v module, transmitting

requests and handling completions. Refer to the “Root Port BFM” on page 17–20

for a full description of this function. This version uses Avalon-ST signalling with

either a 64- or 128-bit data bus interface.

■ altpcierd_tl_cfg_sample.v—accesses Configuration Space signals from the

variant. Refer to the “Chaining DMA Design Examples” on page 17–4 for a

description of this module.

Files in subdirectory <qsys_systemname>/testbench/simulation/submodules:

■ altpcietb_bfm_ep_example_chaining_pipen1b.v—the simulation model for the

chaining DMA Endpoint.

■ altpcietb_bfm_driver_rp.v–this file contains the functions to implement the

shared memory space, PCI Express reads and writes, initialize the Configuration

Space registers, log and display simulation messages, and define global constants.

Root Port BFM

The basic Root Port BFM provides a Verilog HDL task-based interface for requesting

transactions that are issued to the PCI Express link. The Root Port BFM also handles

requests received from the PCI Express link. Figure 17–4 provides an overview of the

Root Port BFM.

Figure 17–4. Root Port BFM

BFM Shared Memory

(altpcietb_bfm_shmem

_common)

BFM Log Interface

(altpcietb_bfm_log

_common)

Root Port RTL Model (altpcietb_bfm_rp_top_x8_pipen1b)

IP Functional Simulation

Model of the Root

Port Interface

(altpcietb_bfm_driver_rp)

Avalon-ST Interface

(altpcietb_bfm_vc_intf)

Root Port BFM

BFM Read/Write Shared Request Procedures

BFM Configuration Procedures

BFM Request Interface

(altpcietb_bfm_req_intf_common)

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