REQ/ACK Synchronizer Verilator Testbench

This directory contains a basic, scratch Verilator testbench targeting functional verification of the REQ/ACK synchronizer primitive during development.

How to build and run the testbench

From the OpenTitan top level execute

fusesoc --cores-root=. run --setup --build \
  lowrisc:dv_verilator:prim_sync_reqack_tb

to build the testbench and afterwards

./build/lowrisc_dv_verilator_prim_sync_reqack_tb_0/default-verilator/Vprim_sync_reqack_tb \
  --trace

to run it.

Details of the testbench

• rtl/prim_sync_reqack_tb.sv: SystemVerilog testbench, instantiates and drives the DUT, counts handshakes in both domains, signals test end and result (pass/fail) to C++ via output ports. Change this file to e.g. for a different clock ratio or more transactions.
• cpp/prim_sync_reqack_tb.cc: Contains main function and instantiation of SimCtrl, reads output ports of DUT and signals simulation termination to Verilator.