gf-cocotb

GF-Cocotb — Python Testbench Generation

Generate Cocotb testbenches as an alternative to SystemVerilog TBs.

Tool Detection

python3 -c "import cocotb" 2>/dev/null

If not found, return GATEFLOW-RESULT ERROR with: pip install cocotb

Test Template

import cocotb
from cocotb.clock import Clock
from cocotb.triggers import RisingEdge

@cocotb.test()
async def test_reset(dut):
    clock = Clock(dut.clk, 10, units="ns")
    cocotb.start_soon(clock.start())
    dut.rst_n.value = 0
    for _ in range(3):
        await RisingEdge(dut.clk)
    dut.rst_n.value = 1
    await RisingEdge(dut.clk)
    assert dut.count.value == 0

When to Use

Cocotb	SV Testbench
Python (lower barrier)	SystemVerilog
Complex stimulus (Python libs)	Protocol + coverage
Slower (co-simulation)	Faster (native)