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Chapter 7: Testbenches 7–5

August 2014 Altera Corporation RapidIO MegaCore Function

User Guide

■

‘WRITE

—transaction type to be executed

■

wr_address

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

■

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. To

perform the reads, run the

rw_data

task defined inside the BFM instance,

bfm_mnt_master. The following parameters are passed to the task:

■

‘READ

— transaction type to be executed

■

rd_address

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

■

rd_data

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

The

rw_data

task performs the read transaction across the Maintenance Read Avalon-

MM slave interface.

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

MAINTENANCE

write request

packet. Similarly, the read transaction across the Avalon-

MM interface is translated into 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. An instance of

avalon_bfm_slave, the BFM for an Avalon-MM slave, is driven by this interface. In the

testbench, the write and read transactions are checked and data is returned for the

read operation. The write operation is checked by invoking the

read_writedata

task

of the BFM. The task returns the write address and the written data. This information

is then checked for data integrity. The read operation is completed on the sister side

by invoking the

write_readdata

task. This task returns the read address and drives

the return data and read control signals on the Avalon-MM master read port of the

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

SWRITE Transactions

The next set of operations performed are Streaming Writes (

SWRITE

). To perform

SWRITE

operations, one register in the IP core must be reconfigured as shown in

Table 7–2.

With the setting in Table 7–2, any write operation presented across the Input/Output

Avalon-MM slave interface on the rio module is translated to a RapidIO Streaming

Write transaction.

Table 7–2. SWRITE Register

Module

Address

Name Value Description

rio 0x1040C

Input/Output

Slave Mapping

Window 0 Control

32'h0055_0002

32'h5555_0002

Sets the

DESTINATION_ID

for outgoing transactions

to the value

0x55

0x5555

, depending on the

device ID width of the sister_rio. This value matches

the base device ID of the sister_rio module. Enables

SWRITE

operations.

1 2 ... 162 163 164 165 166 167 168 169 170 171 172 ... 197 198

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