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Figure 9-2: Avalon-ST Source and Sink Timing

CLK

ready

valid

data

D1 D2

snk_rdya

snk_rdyd

snk_rdya

idle

Table 9-1: Key to Annotations

The following table describes the annotations used in the figure above.

DescriptionSymbol

The idle time between transactions. This time is reported by the command get_transaction_

idles.

idle

Signals the sink has asserted ready. The event name is signal_snk_ready_assert.S

snk_rdya

Signals the transaction has been received and queued. The event name is signal_transaction_

received.

Signals the sink is not ready. The event name is signal_snk_ready_deassert.S

snk_rdyd

Block Diagram

The following figure provides a block diagram of the Avalon-ST Sink BFM. This figure illustrates that the

BFM includes the following five major blocks:

• Avalon-ST Sink API—Provides methods to get Avalon-ST transactions and control the ready signal.

• Transaction Descriptor—Accumulates the fields of an Avalon-ST command.

• Avalon-ST Physical Driver—Asserts and deasserts the ready signal to the system interconnect fabric.

• Physical Bus Monitor—Monitors the physical layer and collects transactions.

Avalon-ST Sink BFM

Altera Corporation

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Block Diagram

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