Altera Avalon Verification IP Suite - Manual (Page 128)

Figure 9-2: Avalon-ST Source and Sink Timing
CLK
ready
valid
data D1 D2
S
snk_rdya
S
snk_rdyd
S
snk_rdyd
S
tr
S
snk_rdya
T idle T idle
Table 9-1: Key to Annotations
The following table describes the annotations used in the figure above.
Description Symbol
The idle time between transactions. This time is reported by the command
get_transaction_
idles
.
T
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
.
S
tr
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 9-2