src/ieee754/fpcommon/packdata.py

   1 # IEEE Floating Point Adder (Single Precision)
   2 # Copyright (C) Jonathan P Dawson 2013
   3 # 2013-12-12
   4
   5 from nmigen import Signal
   6 from ieee754.fpcommon.getop import FPPipeContext
   7
   8
   9 class FPPackData:
  10
  11     def __init__(self, pspec):
  12         width = pspec.width
  13         self.z = Signal(width, reset_less=True)    # result
  14         self.ctx = FPPipeContext(pspec)
  15
  16         # this is complicated: it's a workaround, due to the
  17         # array-indexing not working properly in nmigen.
  18         # self.ports() is used to access the ArrayProxy objects by name,
  19         # however it doesn't work recursively.  the workaround:
  20         # drop the sub-objects into *this* scope and they can be
  21         # accessed / set.  it's horrible.
  22         self.muxid = self.ctx.muxid
  23         self.op = self.ctx.op
  24
  25     def eq(self, i):
  26         return [self.z.eq(i.z), self.ctx.eq(i.ctx)]
  27
  28     def __iter__(self):
  29         yield self.z
  30         yield from self.ctx
  31
  32     def ports(self):
  33         return list(self)