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import cocotb
from cocotb.triggers import RisingEdge, ReadOnly
from cocotb_coverage.coverage import CoverCheck
class PipelineIntegrityChecker:
def __init__(self, dut, name, clk):
self._clk, self._dut = clk, dut
self._queue = [None] * dut.front.bind_.BIND_STAGES.value
self._ready_sticky = False
@CoverCheck(
f'{name}.runnable_tx_ready',
f_pass = lambda ready: not self._ready_sticky and ready,
f_fail = lambda ready: self._ready_sticky and not ready,
)
def sample_ready(ready):
self._ready_sticky = self._ready_sticky or ready
@CoverCheck(
f'{name}.in_to_out_integrity',
f_pass = lambda group: group == self._queue[0] and group is not None,
f_fail = lambda group: group != self._queue[0],
)
def sample_wave_group(group):
pass
self._sample_ready = sample_ready
self._sample_wave_group = sample_wave_group
cocotb.start_soon(self._run())
async def _run(self):
while True:
await RisingEdge(self._clk)
await ReadOnly()
self._sample_ready(self._dut.runnable_in_ready.value)
if self._dut.wave_valid.value:
self._sample_wave_group(self._dut.wave_group.value)
else:
self._sample_wave_group(None)
new_group = None
if self._dut.runnable_out_valid.value:
new_group = self._dut.runnable_out_data.value
self._queue[:-1] = self._queue[1:]
self._queue[-1] = new_group
class PcChecker:
def __init__(self, dut, name, clk, *, mem, pc_table):
self._clk, self._dut = clk, dut
self._mem, self._pc_table = mem, pc_table
@CoverCheck(
f'{name}.pc_ok',
f_pass = lambda wave: wave.insn and self._pc_ok(wave),
f_fail = lambda wave: wave.insn and not self._pc_ok(wave),
)
def sample_wave(wave):
pass
self.sample_wave = sample_wave
def _pc_ok(self, wave):
return wave.insn == self._mem.read(self._pc_table[wave.group] * 4)
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