Altera Avalon Verification IP Suite Uživatelský manuál stáhnout pdf (Strana 28)

Chapter 1: Avalon-MM Master BFM 1–5

Functional Description

May 2011 Altera Corporation Avalon Verification IP Suite User Guide

Block Diagram

Figure 1–4 shows a block diagram of the Avalon-MM Master BFM. As this figure

illustrates, the BFM includes the following major blocks:

■ Avalon-MM Master API—Provides methods to create Avalon-MM transactions

and query the state of all queues.

■ Command Descriptor—Accumulates the fields of an Avalon-MM command

transaction using the

set_command

API calls and inserts completed commands

onto the pending command queue.

■ Avalon-MM Interface Driver—Issues transfers to the system interconnect fabric

and holds each transfer until

waitrequest

is deasserted. For burst transfers, there

is a separate transfer for each word of the burst. The system interconnect fabric can

assert

waitrequest

for each word of the burst, as necessary.

■ Timestamp Counter—Records a timestamp with commands for use in timing

calculations. The driver and monitor both use the timestamp counter for timing

calculations.

■ Avalon-MM Interface Monitor—Monitors the system interconnect fabric and

records responses for read transfers in the response queue.

■ Response Descriptor—Collects information about completed transactions using

the

get_response_

<rolename> API calls. The testbench uses this information for

further analysis.

■ Public Events—Provides status response that arrives together with the data. The

public event signals indicate the status of the Master’s request such as successful

completion, timeout, or error.

ci_1

–S

ci_2

Signals when write and read commands are presented on the interface. The event name is

signal_command_issued

rc_1

Signals the first read response. The event name is

signal_response_complete.

atc

Signals the end of the test. The event name is

signal_all_transactions_complete.

Table 1–2. Key to Annotations in Figure 1–3 (Part 2 of 2)

Symbol Description

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 177 178

Komentáře k této Příručce

Žádné komentáře

Altera Avalon Verification IP Suite Uživatelský manuál Strana 28

Komentáře k této Příručce

Související produkty a manuály pro Měřící nástroje Altera Avalon Verification IP Suite