src/ieee754/fpadd/datastruct.py

   1 """IEEE754 Floating Point Adder Pipeline
   2
   3 Copyright (C) 2019 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   4
   5 """
   6
   7 from nmigen import Signal
   8 from ieee754.fpcommon.fpbase import FPNumBaseRecord, FPRoundingMode
   9 from ieee754.fpcommon.getop import FPPipeContext
  10
  11
  12 class FPAddStage0Data:
  13
  14     def __init__(self, pspec):
  15         width = pspec.width
  16         self.z = FPNumBaseRecord(width, False)
  17         self.out_do_z = Signal(reset_less=True)
  18         self.oz = Signal(width, reset_less=True)
  19         self.tot = Signal(self.z.m_width + 4, reset_less=True) # 4 extra bits
  20         self.ctx = FPPipeContext(pspec)
  21         self.muxid = self.ctx.muxid
  22
  23         self.rm = Signal(FPRoundingMode, reset=FPRoundingMode.DEFAULT)
  24         """rounding mode"""
  25
  26     def eq(self, i):
  27         return [self.z.eq(i.z), self.out_do_z.eq(i.out_do_z), self.oz.eq(i.oz),
  28                 self.tot.eq(i.tot), self.ctx.eq(i.ctx), self.rm.eq(i.rm)]