src/ieee754/cordic/fp_pipe_init_stages.py

   1 from nmigen import Module, Signal, Cat, Const, Mux
   2 from nmigen.cli import main, verilog
   3
   4 from ieee754.fpcommon.fpbase import FPNumDecode, FPNumBaseRecord
   5
   6 from nmutil.pipemodbase import PipeModBase
   7 from ieee754.fpcommon.basedata import FPBaseData
   8 from ieee754.fpcommon.denorm import FPSCData
   9
  10
  11 class FPCordicInitStage(PipeModBase):
  12     def __init__(self, pspec):
  13         super().__init__(pspec, "specialcases")
  14
  15     def ispec(self):
  16         return FPBaseData(self.pspec)
  17
  18     def ospec(self):
  19         return FPSCData(self.pspec, False)
  20
  21     def elaborate(self, platform):
  22         m = Module()
  23         comb = m.d.comb
  24
  25         # decode a/b
  26         width = self.pspec.width
  27         a1 = FPNumBaseRecord(width, False)
  28         m.submodules.sc_decode_a = a1 = FPNumDecode(None, a1)
  29         comb += [a1.v.eq(self.i.a),
  30                  self.o.a.eq(a1)
  31         ]
  32
  33         #  pass through context
  34         comb += self.o.ctx.eq(self.i.ctx)
  35
  36         return m