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, SimpleHandshake
   8
   9 from ieee754.fpcommon.fpbase import FPState, FPID
  10 from .postcalc import FPAddStage1Data
  11 from .postnormalise import FPNorm1ModSingle
  12 from .roundz import FPRoundMod
  13 from .corrections import FPCorrectionsMod
  14 from .pack import FPPackData, FPPackMod
  15
  16
  17 class FPNormToPack(FPState, SimpleHandshake):
  18
  19     def __init__(self, pspec, e_extra=False):
  20         FPState.__init__(self, "normalise_1")
  21         #print ("normtopack", pspec)
  22         self.pspec = pspec
  23         self.e_extra = e_extra
  24         SimpleHandshake.__init__(self, self) # pipeline is its own stage
  25
  26     def ispec(self):
  27         return FPAddStage1Data(self.pspec, e_extra=self.e_extra)
  28
  29     def ospec(self):
  30         return FPPackData(self.pspec) # FPPackMod
  31
  32     def setup(self, m, i):
  33         """ links module to inputs and outputs
  34         """
  35
  36         # Normalisation, Rounding Corrections, Pack - in a chain
  37         nmod = FPNorm1ModSingle(self.pspec, e_extra=self.e_extra)
  38         rmod = FPRoundMod(self.pspec)
  39         cmod = FPCorrectionsMod(self.pspec)
  40         pmod = FPPackMod(self.pspec)
  41         stages = [nmod, rmod, cmod, pmod]
  42         chain = StageChain(stages)
  43         chain.setup(m, i)
  44         self.out_z = pmod.ospec()
  45
  46         self.o = pmod.o
  47
  48     def process(self, i):
  49         return self.o
  50
  51     def action(self, m):
  52         m.d.sync += self.out_z.eq(self.process(None))
  53         m.next = "pack_put_z"