src/ieee754/add/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 singlepipe import StageChain, SimpleHandshake
   8
   9 from fpbase import FPState, FPID
  10 from fpcommon.postcalc import FPAddStage1Data
  11 from fpcommon.postnormalise import FPNorm1ModSingle
  12 from fpcommon.roundz import FPRoundMod
  13 from fpcommon.corrections import FPCorrectionsMod
  14 from fpcommon.pack import FPPackData, FPPackMod
  15
  16
  17 class FPNormToPack(FPState, SimpleHandshake):
  18
  19     def __init__(self, width, id_wid):
  20         FPState.__init__(self, "normalise_1")
  21         self.id_wid = id_wid
  22         self.width = width
  23         SimpleHandshake.__init__(self, self) # pipeline is its own stage
  24
  25     def ispec(self):
  26         return FPAddStage1Data(self.width, self.id_wid) # Norm1ModSingle ispec
  27
  28     def ospec(self):
  29         return FPPackData(self.width, self.id_wid) # FPPackMod ospec
  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.width, self.id_wid)
  37         rmod = FPRoundMod(self.width, self.id_wid)
  38         cmod = FPCorrectionsMod(self.width, self.id_wid)
  39         pmod = FPPackMod(self.width, self.id_wid)
  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
  49
  50     def action(self, m):
  51         m.d.sync += self.out_z.eq(self.process(None))
  52         m.next = "pack_put_z"