Altera Avalon Verification IP Suite - Manual (Page 25)

Table 5-1: Key to the Annotations
The following table lists the annotations used in the figure.
Description Symbol
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 .
T
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.
T
wt_1
waitrequest
is always sampled #1 after the falling edge of
clk
. T
wr
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 .
T
rl_1
The response latency for the second read, which is 3 cycles. The program gets this time using
the
get_response_latency command.
T
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.
T
wrl_1
Signals when write or read commands are presented on the interface. The event name is
signal_
command_issued
.
S
ci_1
–S
ci_4
Signals write responses. The event name is signal_response_complete. S
rc_1
,S
rc_3
Signals read responses. The event name is
signal_response_complete.
S
rc_2
,S
rc_4
Signals the end of the test. The event name is
signal_all_transactions_complete
S
atc
Reference number to identify each read or write transaction. T
ID_1
–T
ID_
4
Reference number to identify each write transaction. ID_1, ID_3
Reference number to identify each read transaction. ID_2, ID_4
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5-3 Timing