Source code for hwtLib.mem.lutRam

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from hwt.code import Concat, If
from hwt.hdl.typeShortcuts import hBit, vec
from hwt.hdl.types.bits import Bits
from hwt.interfaces.std import Signal, Clk
from hwt.serializer.mode import serializeExclude
from hwt.synthesizer.unit import Unit
from hwt.synthesizer.param import Param


[docs]def mkLutRamCls(DATA_WIDTH):
    """
    Lut ram generator
    hdl code will be excluded from serialization because we expect vendor library to contains it
    """

    @serializeExclude
    class RAMnX1S(Unit):

        def _config(self):
            self.INIT = Param(vec(0, DATA_WIDTH))
            self.IS_WCLK_INVERTED = Param(hBit(0))

        def _declr(self):
            self.a0 = Signal()
            self.a1 = Signal()
            self.a2 = Signal()
            self.a3 = Signal()
            self.a4 = Signal()
            self.a5 = Signal()
            self.d = Signal()  # in

            self.wclk = Clk()
            self.o = Signal()  # out
            self.we = Signal()

        def _impl(self):
            s = self._sig
            wclk_in = s("wclk_in")
            mem = self._ctx.sig("mem", Bits(DATA_WIDTH + 1),
                                 defVal=hBit(None)._concat(self.INIT))
            a_in = s("a_in", Bits(6))
            d_in = s("d_in")
            we_in = s("we_in")

            wclk_in(self.wclk ^ self.IS_WCLK_INVERTED)
            we_in(self.we)
            a_in(Concat(self.a5, self.a4, self.a3, self.a2, self.a1, self.a0))
            d_in(self.d)

            # ReadBehavior
            self.o(mem[a_in])

            # WriteBehavior
            If(wclk_in._onRisingEdge() & we_in,
               mem[a_in](d_in)
            )

    RAMnX1S.__name__ = "RAM%dX1S" % DATA_WIDTH
    return RAMnX1S


RAM64X1S = mkLutRamCls(64)


if __name__ == "__main__":
    from hwt.synthesizer.utils import toRtl
    print(toRtl(RAM64X1S))