src/ieee754/fpcommon/normtopack.py

   1 # IEEE Floating Point Adder (Single Precision)
   2 # Copyright (C) Jonathan P Dawson 2013
   3 # 2013-12-12
   4
   5 #from nmigen.cli import main, verilog
   6
   7 from nmutil.singlepipe import StageChain
   8
   9 from ieee754.pipeline import DynamicPipe
  10 from ieee754.fpcommon.postcalc import FPAddStage1Data
  11 from ieee754.fpcommon.postnormalise import FPNorm1ModSingle
  12 from ieee754.fpcommon.roundz import FPRoundMod
  13 from ieee754.fpcommon.corrections import FPCorrectionsMod
  14 from ieee754.fpcommon.pack import FPPackData, FPPackMod
  15
  16
  17 class FPNormToPack(DynamicPipe):
  18
  19     def __init__(self, pspec, e_extra=False):
  20         #print ("normtopack", pspec)
  21         self.pspec = pspec
  22         self.e_extra = e_extra
  23         super().__init__(pspec)
  24
  25     def ispec(self):
  26         return FPAddStage1Data(self.pspec, e_extra=self.e_extra)
  27
  28     def ospec(self):
  29         return FPPackData(self.pspec) # FPPackMod
  30
  31     def setup(self, m, i):
  32         """ links module to inputs and outputs
  33         """
  34
  35         # Normalisation, Rounding Corrections, Pack - in a chain
  36         nmod = FPNorm1ModSingle(self.pspec, e_extra=self.e_extra)
  37         rmod = FPRoundMod(self.pspec)
  38         cmod = FPCorrectionsMod(self.pspec)
  39         pmod = FPPackMod(self.pspec)
  40         stages = [nmod, rmod, cmod, pmod]
  41         chain = StageChain(stages)
  42         chain.setup(m, i)
  43         self.out_z = pmod.ospec()
  44
  45         self.o = pmod.o
  46
  47     def process(self, i):
  48         return self.o