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