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Chapter 7: Testbench 7–9

Testbench Sequence

August 2014 Altera Corporation RapidIO II MegaCore Function

User Guide

Next, the test pushes five

DOORBELL

messages to the transmit

DOORBELL

Message FIFO

of the DUT. The test increments the message payload for each transaction, which

occurs when the drbl_master_bfm

read_write_cmd

task is invoked with a

‘WRITE

operation to the

doorbell

0x0000_000C

. This action programs the

16-bit message, an incrementing payload in this example, as well as the

DESTINATION_ID

—

0xCD

for an 8-bit device ID or

0xCDCD

for a 16-bit device ID—which

is used in the

DOORBELL

transaction packet.

To verify that the

DOORBELL

request packets have been sent, the test waits for the

drbell_s_irq

signal to be asserted. The test then reads the

Doorbell

Completion

DOORBELL

messages that have been added to the Tx Completion FIFO. Five successfully

completed

DOORBELL

messages should appear in that FIFO and each one should be

accessible by reading the

Tx Doorbell

Completion

perform this verification, the test invokes the

read_data

task defined in the instance

drbl_master_bfm.

The test waits for the DUT to assert the

drbell_s_irq

signal, which indicates that a

DOORBELL

message has been received. The test then reads the five received

DOORBELL

messages, by calling the

read_write_cmd

task with a

‘READ

operation to the

DOORBELL

0x0000_0000

. The task is called five times, once for each

message, to return the received

DOORBELL

message.

Port-Write Transactions

To test port-writes, the test performs some basic configuration of the port-write

registers in the DUT and the sister_rio module. It then programs the DUT to transmit

port-write request packets to the sister_rio module. The port-writes are received by

the sister_rio module and retrieved by the test program.

The configuration enables the

RX_PACKET_STORED

interrupt in the sister_rio module. If

this interrupt is enabled, the sister_rio module asserts its

mnt_mnt_s_irq

signal when

the sister_rio module receives a Port-Write transaction and the payload can be

retrieved. To enable the interrupt, the testbench calls the sister_sys_mnt_master_bfm

read_write_cmd

task.

A write operation is performed by the task with the address

0x10084

and data

0x10

passed as parameters. In addition, the sister_rio module must be enabled to receive

Port-Write transactions from the DUT. The task is called with the address

0x10250

and

data

0x1

After the configuration is complete, the test performs the operations listed in

Table 7–5.

Table 7–5. Port-Write Test

Operation Action

Places data into the

TX_PORT_WRITE_BUFFER

Write incrementing payload to registers at

addresses

0x10210

0x1024C

Indicates to the DUT that Port-Write data is ready

Write

DESTINATION_ID

0xCD

0xCDCD

depending on the device ID width setting, and

PACKET_READY

0x1

0x10200

Waits for the sister_rio module to receive the port-write

Monitor the sister_rio module

mnt_mnt_s_irq

signal

1 2 ... 198 199 200 201 202 203 204 205 206 207 208 ... 217 218

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