Altera Avalon Verification IP Suite Manual do Utilizador descarregar pdf (Página 27)

DescriptionSymbol

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

signal_command_issued.

ci_1

–S

ci_2

Signals the first read response. The event name is signal_response_complete.S

rc_1

Signals the end of the test. The event name is signal_all_transactions_complete.S

atc

Block Diagram

The following figure provides 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 call. 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.

Altera Corporation

Avalon-MM Master BFM

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Block Diagram

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Altera Avalon Verification IP Suite Manual do Utilizador Página 27