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Figure 8-2: Avalon-ST Source Sending Data to a Sink

The following figure illustrates the timing when READY_LATENCY = 0.

CLK

ready

valid

data

D1 D2

src_dr

src_rdy

src_~rdy

src_rdy

idle

rl_1

Table 8-1: Key to Annotations

The following table explains the annotations used in the figure.

DescriptionSymbol

The idle time before a transactions. This time is set by the command set_transaction_

idles.

idle

The response latency for the first source to sink transaction, which is 3 cycles. The source

gets this time using the get_response_latency command.

rl_1

Signals that the source is driving valid data. The event name is signal_src_driving_

transaction.

src_dr

Signals the source has received the assertion of ready from the sink. The event name is

signal_src_ready.

src_rdy

Signals the first transaction is complete. The event name is signal_src_transaction_

complete.

Signals the source has received the deassertion of ready from the sink. The event name

is signal_src_not_ready.

src_~rdy

Block Diagram

The following figure provides a block diagram of the Avalon-ST Source BFM. 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 is 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.

Avalon-ST Source BFM

Altera Corporation

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Block Diagram

8-2

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 223 224

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