Altera RapidIO MegaCore Function - Manual (Page 165)

Chapter 7: Testbenches 7–3
August 2014 Altera Corporation RapidIO MegaCore Function
User Guide
■ _avalon_bfm_master.v
■ >_avalon_bfm_slave.v
In non-Arria 10 variations, the file _tb.v implements the code that
performs the test transactions.
In Arria 10 variations, the BFMs, the connections, and the test transaction generation
are integrated in the main testbench file <design_name>_altera_rapidio_140.tb_rio.
The code that performs the test transactions performs a reset and initialization
sequence necessary for the DUT and sister_rio IP cores to establish a link and
exchange packets.
Reset, Initialization, and Configuration
In the testbench generated for non-Arria 10 variations, the clocks that drive the
testbench are defined and generated in the _hookup.iv file. In the
testbench generated for Arria 10 variations, the clocks are defined and generated in
the main testbench file.
1 Refer to _hookup.iv or the main testbench file, as appropriate for your
IP core variation, for the exact frequencies used for each of the clocks. The frequencies
depend on the configuration of the variation.
The reset sequence is simple—the main reset signal for the DUT and the sister_rio IP
core, reset_n, is driven low at the beginning of the simulation, is kept low for 200 ns,
and is then deasserted.
After reset_n is deasserted, the testbench waits until both the DUT and the sister_rio
modules have driven their port_initialized
output signals high. These signal
transitions indicate that both IP cores have completed their initialization sequence.
The testbench then waits an additional 5000 ns, to allow time for a potential reset
link-request control symbol exchange between the DUT and the sister_rio module.
The testbench again waits until both the DUT and the sister_rio modules have driven
their port_initialized output signals high. Following the 5000 ns wait, these signals
indicate that the link is established and the Physical layer is ready to exchange traffic.
Next, basic programming of the internal registers is performed in the DUT and the
sister_rio module.
Table 7–1 shows the registers that are programmed in both the
DUT and the sister_rio IP cores. For a full description of each register, refer to
Chapter 6, Software Interface .
Table 7–1. Testbench Registers (Part 1 of 2)
Module
Register
Address
Register Name Description Value
rio 0x00060 Base Device ID CSR
Program the DUT to have an 8-bit base device ID
of 0xAA or a 16-bit device ID of 0xAAAA. 32'h00AA_FFFF or
32’h00FF_AAAA
rio 0x0013C
General Control
CSR
Enable Request packet generation by the DUT. 32'h6000_0000
sister_rio 0x00060 Base Device ID CSR
Program the sister_rio module to have an 8-bit
base device ID of 0x55 or a 16-bit device ID of
0x5555
.
32'h0055_FFFF
or
32’h00FF_5555