src/ieee754/fpmul/datastructs.py

   1 """IEEE754 Floating Point Multiplier Pipeline
   2
   3 Copyright (C) 2019 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   4
   5 """
   6
   7 from nmigen import Signal
   8
   9 from ieee754.fpcommon.fpbase import FPNumBaseRecord
  10 from ieee754.fpcommon.getop import FPPipeContext
  11
  12
  13 class FPMulStage0Data:
  14
  15     def __init__(self, pspec):
  16         width = pspec.width
  17         self.z = FPNumBaseRecord(width, False)
  18         self.out_do_z = Signal(reset_less=True)
  19         self.oz = Signal(width, reset_less=True)
  20         mw = (self.z.m_width)*2 - 1 + 3 # sticky/round/guard bits + (2*mant) - 1
  21         self.product = Signal(mw, reset_less=True)
  22         self.ctx = FPPipeContext(pspec)
  23         self.muxid = self.ctx.muxid
  24
  25     def eq(self, i):
  26         return [self.z.eq(i.z), self.out_do_z.eq(i.out_do_z), self.oz.eq(i.oz),
  27                 self.product.eq(i.product), self.ctx.eq(i.ctx)]
  28