Reference Card

coro: a coroutine; task: a running coroutine

Assign	dut.mysignal <= 0xFF00
Assign immediately	dut.mysignal.setimmediatevalue(0xFF00)
Assign metavalue	dut.mysignal <= BinaryValue("X")
Read	val = dut.mysignal.value (mysig = dut.mysignal creates an alias/reference)
Bit slice	mybit = dut.myarray[0].value mybits = dut.mysignal.value[0]
Convert	val = dut.mysignal.value.integer val = dut.mysignal.value.binstr
Check	assert dut.mysignal.value == exp, "Not as expected!"
Logging	dut._log.info("Value is", dut.mysignal.value)
Wait time	await cocotb.triggers.Timer(12, "ns")
Generate clock	clk = cocotb.fork(Clock(dut.clk, 12, "ns").start())
Wait for signal edge	await cocotb.triggers.RisingEdge(dut.mysignal) await cocotb.triggers.FallingEdge(dut.mysignal) await cocotb.triggers.Edge(dut.mysignal)
Run coros concurrently	task_0 = cocotb.fork(coro_0()) task_1 = cocotb.scheduler.start_soon(coro) result = await task_0
Resume on Task 0 or 1	await cocotb.triggers.First(task_0, task_1)
Resume on Task 0 and 1	await cocotb.triggers.Combine(task_0, task_1)
Kill coro	task_0.kill()
Set up event	e = cocotb.triggers.Event()
Wake up waiters	e.set()
Wait until set()	await e.wait()
Reset after set()	e.clear()
Timeout	await cocotb.triggers.with_timeout(coro, 1, "us")
Force value	dut.mysignal <= cocotb.handle.Force(0xFF00)
Keep value	dut.mysignal <= cocotb.handle.Freeze()
Release Force/Freeze	dut.mysignal <= cocotb.handle.Release()
Normal assignment with <= is a “deposit” (cocotb.handle.Deposit())
Mark as test	@cocotb.test(skip, expect_fail, timeout_time, timeout_unit)
Normal func → coro	@cocotb.external()
Allow func to block	@cocotb.function()
Set up TestFactory	tf = cocotb.regression.TestFactory(coro)
Add test option	tf.add_option("arg", ["val0", "val1"])
Generate tests	tf.generate_tests()