Examples of using cocotb for functional verification of VHDL designs with GHDL.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

85 lines
2.3 KiB

import logging
from cocotb.triggers import FallingEdge, RisingEdge, Timer, ReadOnly
class Vai:
"""VAI base class"""
def __init__(self, clock, data, valid, accept, *args, **kwargs):
self._version = "0.0.1"
self.log = logging.getLogger(f"cocotb.{data._path}")
self._data = data
self._valid = valid
self._accept = accept
self._clock = clock
self._clkedge = RisingEdge(self._clock)
class VaiDriver(Vai):
"""Valid-Accept Driver"""
def __init__(self, clock, data, valid, accept, *args, **kwargs):
super().__init__(clock, data, valid, accept, *args, **kwargs)
self.log.info("Valid-accept driver")
self.log.info(" cocotbext-vai version %s", self._version)
self.log.info(" Copyright (c) 2022 Torsten Meissner")
# Drive input defaults (setimmediatevalue to avoid x asserts)
self._data.setimmediatevalue(0)
self._valid.setimmediatevalue(0)
async def send(self, data, sync=True):
if sync:
await self._clkedge
self.log.info("Sending data: %s", hex(data))
self._valid.value = 1
self._data.value = data
while True:
await ReadOnly()
if self._accept.value:
break
await self._clkedge
await self._clkedge
self._valid.value = 0
class VaiReceiver(Vai):
"""Valid-Accept Receiver"""
def __init__(self, clock, data, valid, accept, *args, **kwargs):
super().__init__(clock, data, valid, accept, *args, **kwargs)
self.log.info("Valid-accept receiver")
self.log.info(" cocotbext-vai version %s", self._version)
self.log.info(" Copyright (c) 2022 Torsten Meissner")
# Drive input defaults (setimmediatevalue to avoid x asserts)
self._accept.setimmediatevalue(0)
async def receive(self, sync=True):
if sync:
await self._clkedge
while True:
await ReadOnly()
if self._valid.value:
break
await self._clkedge
await self._clkedge
self._accept.value = 1
_rec = self._data.value
self.log.info("Received data: %s", hex(_rec))
await self._clkedge
self._accept.value = 0
return _rec