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import cocotb
from cocotb.clock import Clock
from cocotb.queue import Queue
from cocotb.triggers import Event, ReadOnly, RisingEdge
from cocotb_bus.drivers import BusDriver
from .data import BAD_PC
class ClockResetDriver:
def __init__(self, dut):
self._reset_event = Event('reset_done')
dut.clk.setimmediatevalue(0)
dut.rst_n.setimmediatevalue(0)
self._dut = dut
self._clock_gen = Clock(dut.clk, 2, 'step')
def start(self):
cocotb.start_soon(self._clock_gen.start())
cocotb.start_soon(self.reset())
async def reset(self):
self._reset_event.clear()
self._dut.rst_n.value = 0
await RisingEdge(self._dut.clk)
self._dut.rst_n.value = 1
await ReadOnly()
self._reset_event.set()
async def wait_for_reset(self):
await self._reset_event.wait()
class PcDriver(BusDriver):
_signals = ['pc', 'group']
def __init__(self, *args, table, **kwargs):
super().__init__(*args, **kwargs)
self._table = table
self._delay1 = BAD_PC
self._delay2 = BAD_PC
self._delay3 = BAD_PC
cocotb.start_soon(self._run())
async def _run(self):
while True:
self.bus.pc.value = self._delay3
await RisingEdge(self.clock)
self._delay3 = self._delay2
self._delay2 = self._delay1
self._delay1 = self._table[self.bus.group.value]
class LoopDriver(BusDriver):
_signals = ['group', 'valid']
def __init__(self, *args, maxsize=8, **kwargs):
super().__init__(*args, **kwargs)
self._queue = Queue(maxsize=maxsize)
self.bus.valid.setimmediatevalue(0)
cocotb.start_soon(self._run())
async def put(self, group):
await self._queue.put(group)
async def _run(self):
while True:
await RisingEdge(self.clock)
valid = not self._queue.empty()
if valid:
group = self._queue.get_nowait()
valid = group is not None
self.bus.valid.value = int(valid)
if valid:
self.bus.group.value = group
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