examples/alu.py

   1 from nmigen import *
   2 from nmigen.cli import rtlil
   3
   4
   5 class ALU(Elaboratable):
   6     def __init__(self, width):
   7         self.sel = Signal(2)
   8         self.a   = Signal(width)
   9         self.b   = Signal(width)
  10         self.o   = Signal(width)
  11         self.co  = Signal()
  12         #self.m_clock   = Signal(reset_less=True)
  13         #self.p_reset   = Signal(reset_less=True)
  14
  15     def elaborate(self, platform):
  16         m = Module()
  17         #m.domains.sync = ClockDomain()
  18         #m.d.comb += ClockSignal().eq(self.m_clock)
  19
  20         with m.If(self.sel == 0b00):
  21             m.d.sync += self.o.eq(self.a | self.b)
  22         with m.Elif(self.sel == 0b01):
  23             m.d.sync += self.o.eq(self.a & self.b)
  24         with m.Elif(self.sel == 0b10):
  25             m.d.sync += self.o.eq(self.a ^ self.b)
  26         with m.Else():
  27             m.d.sync += Cat(self.o, self.co).eq(self.a - self.b)
  28         return m
  29
  30
  31 def create_ilang(dut, ports, test_name):
  32     vl = rtlil.convert(dut, name=test_name, ports=ports)
  33     with open("%s.il" % test_name, "w") as f:
  34         f.write(vl)
  35
  36 if __name__ == "__main__":
  37     alu = ALU(width=16)
  38     create_ilang(alu, [alu.o, alu.a, alu.b, alu.co], "alu")
  39