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118 lines
3.8 KiB
118 lines
3.8 KiB
import cocotb
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from cocotb.triggers import RisingEdge, Timer
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from cocotb.queue import QueueEmpty, Queue
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from cocotb.clock import Clock
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import logging
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import enum
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import pyuvm
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# Logger setup
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logging.basicConfig(level=logging.NOTSET)
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logger = logging.getLogger()
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logger.setLevel(logging.DEBUG)
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# AES mode enum
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@enum.unique
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class Mode(enum.IntEnum):
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Encrypt = 0
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Decrypt = 1
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# VAI BFM with queues for
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class VaiBfm(metaclass=pyuvm.Singleton):
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"""Valid-Accept Bfm"""
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def __init__(self):
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self.log = logging.getLogger()
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self.log.info("Valid-accept BFM")
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self.log.info(" Copyright (c) 2022 Torsten Meissner")
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self.dut = cocotb.top
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self.driver_queue = Queue(maxsize=1)
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self.in_monitor_queue = Queue(maxsize=0)
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self.out_monitor_queue = Queue(maxsize=0)
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self.clock = Clock(self.dut.clk_i, 10, units="ns") # Create a 10 ns period clock
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cocotb.start_soon(self.clock.start())
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# Reset coroutine
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async def reset(self):
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self.dut.reset_i.value = 0
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self.dut.valid_i.value = 0
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self.dut.mode_i.value = 0
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self.dut.key_i.value = 0
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self.dut.data_i.value = 0
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self.dut.accept_i.value = 0
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await Timer(100, units="ns")
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self.dut.reset_i.value = 1
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# VAI input driver
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async def __driver(self):
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self.dut.valid_i.value = 0
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self.dut.key_i.value = 0
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self.dut.data_i.value = 0
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while True:
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await RisingEdge(self.dut.clk_i)
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if not self.dut.valid_i.value:
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try:
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(mode, key, data) = self.driver_queue.get_nowait()
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self.dut.mode_i.value = mode
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self.dut.key_i.value = key
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self.dut.data_i.value = data
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self.dut.valid_i.value = 1
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except QueueEmpty:
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continue
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else:
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if self.dut.accept_o.value:
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self.dut.valid_i.value = 0
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# VAI output receiver
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# We ignore data out, we use the output monitor instead
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async def __receiver(self):
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self.dut.accept_i.value = 0
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while True:
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await RisingEdge(self.dut.clk_i)
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if self.dut.valid_o.value and not self.dut.accept_i.value:
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self.dut.accept_i.value = 1
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else:
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self.dut.accept_i.value = 0
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# VAI input monitor
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async def __in_monitor(self):
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while True:
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await RisingEdge(self.dut.clk_i)
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if self.dut.valid_i.value and self.dut.accept_o.value:
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in_tuple = (self.dut.mode_i.value,
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self.dut.key_i.value,
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self.dut.data_i.value)
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self.in_monitor_queue.put_nowait(in_tuple)
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# VAI output monitor
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async def __out_monitor(self):
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while True:
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await RisingEdge(self.dut.clk_i)
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if self.dut.valid_o.value and self.dut.accept_i.value:
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out_data = self.dut.data_o.value
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self.out_monitor_queue.put_nowait(out_data)
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# Launching the coroutines using start_soon
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def start_tasks(self):
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cocotb.start_soon(self.__driver())
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cocotb.start_soon(self.__receiver())
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cocotb.start_soon(self.__in_monitor())
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cocotb.start_soon(self.__out_monitor())
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# The get_input() coroutine returns the next VAI input
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async def get_input(self):
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data = await self.in_monitor_queue.get()
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return data
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# The get_output() coroutine returns the next VAI output
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async def get_output(self):
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data = await self.out_monitor_queue.get()
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return data
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# send_op puts the VAI input operation into the driver queue
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async def send_op(self, mode, key, data):
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await self.driver_queue.put((mode, key, data))
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