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Table 5-1: Key to the Annotations

The following table lists the annotations used in the figure.

DescriptionSymbol

The initial command latency, which is two cycles for transactions 1 and 2. This time is set by

the API command set_command_init_latency.

init

The response wait time, which is three cycles. This time is determined by the number of cycles

that the waitrequest signal is asserted by the slave.The program gets this value using the get_

response_wait_time command.

wt_1

waitrequest is always sampled #1 after the falling edge of clk.T

The idle time after each transaction. This time is set by the command set_command_idle.T

idle

The response latency for the first read, which is 3 cycles. This is the time between the read

command acceptance and the read response provided by the slave. The program gets this time

using the get_response_latency command.

If an Avalon-MM slave component defines the readLatency interface property, the

readdatavalid signal is not used. The readdatavalid signal is not necessary because the slave

component has a fixed read latency.

For more information refer to the Avalon Interface Specifications.

rl_1

The response latency for the second read, which is 3 cycles. The program gets this time using

the get_response_latency command.

rl_2

The write response latency for the first write, which is 3 cycles. This is the time between when

the write command acceptance and the write response is provided by the slave. The program

gets this time using the get_response_latency command.

wrl_1

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

command_issued.

ci_1

–S

ci_4

Signals write responses. The event name is signal_response_complete.S

rc_1

rc_3

Signals read responses. The event name is signal_response_complete.S

rc_2

rc_4

Signals the end of the test. The event name is signal_all_transactions_completeS

atc

Reference number to identify each read or write transaction.T

ID_1

–T

ID_

Reference number to identify each write transaction.ID_1, ID_3

Reference number to identify each read transaction.ID_2, ID_4

Altera Corporation

Avalon-MM Master BFM

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5-3

Timing

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 223 224

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