airhdl / osvvm-demo

A project demonstrating how to use the OSVVM library and its Axi4LiteManager verification component to simulate an airhdl register bank.

OSVVM Demonstrator

A VHDL project demonstrating how to use the OSVVM library to check the correct operation of an airhdl register bank.

Architecture

The testbench instantiates an airhdl register bank, osvvm_regs, which contains two registers:

• a read/write Control register with a 16-bit value field
• a read-only Status register with a 16-bit value field

The Control.value output port of the register bank, which reflects the current value of the Control.value field, is looped back to the Status.value input port, which represents the value to be read from the Status.value field.

The Axi4LiteManager component, which is part of the OSVVM library, acts as an AXI4-Lite master. It is remote-controlled by the Test Controller (tb_osvvm_regs_testctrl) through a standard OSVVM transaction record signal.

Following the standard OSVVM pattern, test cases are implemented as alternative architectures of the Test Controller component. The design currently features the following test cases:

Test case	Source file	Description
operation	tb_osvvm_regs_operation.vhd	Normal operation test case. Writes a test pattern to the Control.value field and checks that the value can be read back through the Status.value field.

Running the Simulation

To run the OSVVM test suite, execute the following commands in the simulator console:

cd sim
source ../lib/OsvvmLibraries/Scripts/StartUp.tcl
build ../lib/OsvvmLibraries
build ../RunAllTests.pro

If the test suite completes succesfully, you should see something like this in the simulator console:

# KERNEL: %% Log   ALWAYS  in Default, Write Control register at 76 ns
# KERNEL: %% Log   INFO    in Axi4LiteManager, Write Data.  WData: 00001234  WStrb: 1111  Operation# 1 at 85 ns
# KERNEL: %% Log   INFO    in Axi4LiteManager, Write Address.  AWAddr: A0000000  AWProt: 000  Operation# 1 at 85 ns
# KERNEL: %% Log   ALWAYS  in Default, Read Status register at 105 ns
# KERNEL: %% Log   INFO    in Axi4LiteManager, Read Address.  ARAddr: A0000000  ARProt: 000  Operation# 1 at 105 ns
# KERNEL: %% Log   INFO    in Axi4LiteManager, Read Data: 00001234  Read Address: A0000000  Prot: 0 at 145 ns
# KERNEL: %% DONE  PASSED  tb_osvvm_regs_operation  Passed: 3  Affirmations Checked: 3  at 145 ns

Acknowledgments

Many thanks to:

• Jim Lewis of SynthWorks Design Inc. for the OSVVM support.
• Sigasi for providing a Sigasi Studio XPRT license, which was of great help for implementing this project.