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126 lines
4.0 KiB
126 lines
4.0 KiB
import logging
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import cocotb
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from cocotb.utils import get_sim_time
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from cocotb.triggers import FallingEdge, RisingEdge, Timer, ReadOnly
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class Sram:
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def __init__(self, clk, wen, ren, adr, din, dout, mem, *args, **kwargs):
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self._version = "0.0.1"
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self.log = logging.getLogger(f"cocotb.{clk._path}")
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self._clk = clk
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self._wen = wen
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self._ren = ren
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self._adr = adr
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self._din = din
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self._dout = dout
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self._mem = mem
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self._clkedge = RisingEdge(self._clk)
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class SramRead(Sram):
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def __init__(self, clk, ren, adr, din, mem, *args, **kwargs):
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super().__init__(clk, None, ren, adr, din, None, mem, *args, **kwargs)
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self.log.info("SRAM read")
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self.log.info(" cocotbext-sram version %s", self._version)
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self.log.info(" Copyright (c) 2022 Torsten Meissner")
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self._active = None
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self._restart()
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def _restart(self):
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self.log.debug("SramRead._restart()")
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if self._active is not None:
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self._active.kill()
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# Schedule SRAM read to run concurrently
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self._active = cocotb.start_soon(self._read())
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async def _read(self):
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self.log.debug("SramRead._read()")
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while True:
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await self._clkedge
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if self._ren.value == 1:
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_data = self._mem[str(self._adr.value)]
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self._din.value = _data
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self.log.info("Read data: %s from adr: %s", hex(_data), hex(self._adr.value))
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class SramWrite(Sram):
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def __init__(self, clk, wen, adr, dout, mem, *args, **kwargs):
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super().__init__(clk, wen, None, adr, None, dout, mem, *args, **kwargs)
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self.log.info("SRAM write")
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self.log.info(" cocotbext-sram version %s", self._version)
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self.log.info(" Copyright (c) 2022 Torsten Meissner")
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self._active = None
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self._restart()
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def _restart(self):
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self.log.debug("SramWrite._restart()")
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if self._active is not None:
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self._active.kill()
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# Schedule SRAM write to run concurrently
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self._active = cocotb.start_soon(self._write())
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async def _write(self):
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self.log.debug("SramWrite._write()")
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while True:
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await self._clkedge
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if self._wen.value == 1:
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self._mem[str(self._adr.value)] = self._dout.value
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self.log.info("Wrote data: %s to adr: %s", hex(self._dout.value), hex(self._adr.value))
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class SramMonitor(Sram):
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def __init__(self, clk, wen, ren, adr, din, dout, *args, **kwargs):
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super().__init__(clk, wen, ren, adr, din, dout, None, *args, **kwargs)
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self.log.info("SRAM monitor")
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self.log.info(" cocotbext-sram version %s", self._version)
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self.log.info(" Copyright (c) 2022 Torsten Meissner")
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self._active = None
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self._transactions = {}
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self._restart()
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def _restart(self):
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self.log.debug("SramMonitor._restart()")
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if self._active is not None:
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self._active.kill()
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# Schedule SRAM read to run concurrently
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self._active = cocotb.start_soon(self._read())
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async def _read(self):
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self.log.debug("SramMonitor._read()")
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while True:
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await self._clkedge
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if self._wen.value:
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self._transactions[str(get_sim_time('ns'))] = {
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"type" : "write",
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"adr" : self._adr.value,
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"data" : self._dout.value}
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elif self._ren.value:
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_adr = self._adr.value
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await self._clkedge
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await ReadOnly()
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self._transactions[str(get_sim_time('ns'))] = {
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"type" : "read",
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"adr" : _adr,
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"data" : self._din.value}
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@property
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def transactions(self, index=None):
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if index:
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key = list(self._transactions.keys())[index]
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return {key: self._transactions[key]}
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else:
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return self._transactions
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