Altera RapidIO II MegaCore Function Bedienungsanleitung PDF herunterladen (Seite 199)

Chapter 7: Testbench 7–5

Testbench Sequence

August 2014 Altera Corporation RapidIO II MegaCore Function

User Guide

Maintenance Write and Read Transactions

If the Maintenance module is present, the testbench sends a few

MAINTENANCE read

and

write request

packets from the DUT to the sister_rio module. Transactions are

initiated by Avalon-MM transactions on the DUT's Maintenance Avalon-MM slave

interface, and are checked on the sister_rio’s Maintenance Avalon-MM master

interface.

The first set of tests performed are

MAINTENANCE write

and

read requests

. The DUT

sends two

MAINTENANCE write requests

to the sister_rio module. The testbench

performs the writes by running the

mnt_test_rw_trans

task with the following

parameter values:

■

‘WRITE

—transaction type to be executed

■

mnt_address

—address to be driven on the Avalon-MM address bus

■

mnt_wr_data

—write data to be driven on the Avalon-MM write data bus

The task performs the write transaction across the Maintenance Write Avalon-MM

slave interface.

The DUT then sends two

MAINTENANCE

read requests

to the sister_rio module. The

testbench performs the writes by running the

mnt_test_rw_trans

task with the

following parameter values:

■

‘READ

— transaction type to be executed

■

mnt_address

—address to be driven on the Avalon-MM address bus

■

mnt_rd_data

—parameter that stores the data read across the Avalon-MM read

data bus

The

mnt_test_rw_trans

task performs the read transaction across the Maintenance

Read Avalon-MM slave interface.

The write transaction the testbench sends across the Avalon-MM interface is

translated by the DUT to a RapidIO

MAINTENANCE

write request

packet. Similarly, the

read transaction across the Avalon-MM interface is translated to a RapidIO

MAINTENANCE

read request

packet.

The

MAINTENANCE

write

and

read request

packets are received by the sister_rio

module and translated to Avalon-MM transactions that are presented across the

sister_rio module’s Maintenance master Avalon-MM interface. In the testbench, the

write and read transactions are checked and data is returned for the read operation.

The read data is checked after it is received by the DUT.

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