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Chapter 1: Avalon-ST Source BFM 1–3

Functional Description

May 2011 Altera Corporation Avalon Verification IP Suite User Guide

Block Diagram

Figure 1–3 shows a block diagram of the Avalon-ST Source BFM. This figure

illustrates, the BFM includes the following six major blocks:

■ Avalon-ST Source API—Provides methods to create Avalon-ST transactions and

query the state of all queues.

■ Transaction Descriptor—Accumulates the fields of an Avalon-ST command and

inserts completed commands onto the pending command queue.

■ Avalon-ST Physical Driver—Issues transfers and holds each transfer until

ready

asserted.

■ Physical Bus Monitor—Monitors the physical layer and reports on the status of the

ready signal to the Physical Bus Driver and the Public Events module.

■ Public Events—Signals the events described in the API.

■ Response Descriptor—Collects information about completed transactions.

Figure 1–3. Block Diagram of the Avalon-ST Source BFM

Transaction Descriptor

Public

Events

Avalon-ST Source BFM API

(Transaction Level Commands)

Avalon-ST Interface

Physical Layer

Response Descriptor

Transaction

Queue

Pending

Response

Queue

Physical

Bus Driver

Physical

Bus Monior

valid

data

channel

startofpacket

endofpacket

error

empty

ready

push_transaction() pop_transaction(

)

Backpressure (ready)

Backpressure

latency

Signals

Events

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 177 178

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