src/ieee754/fpdiv/pipeline.py

   1 # IEEE Floating Point Adder (Single Precision)
   2 # Copyright (C) Jonathan P Dawson 2013
   3 # 2013-12-12
   4
   5 from nmigen import Module
   6 from nmigen.cli import main, verilog
   7
   8 from nmutil.singlepipe import ControlBase
   9 from nmutil.concurrentunit import ReservationStations, num_bits
  10
  11 from ieee754.fpcommon.getop import FPADDBaseData
  12 from ieee754.fpcommon.denorm import FPSCData
  13 from ieee754.fpcommon.pack import FPPackData
  14 from ieee754.fpcommon.normtopack import FPNormToPack
  15 from .specialcases import FPDivSpecialCasesDeNorm
  16 from .mulstages import FPDivStages
  17
  18
  19
  20 class FPDIVBasePipe(ControlBase):
  21     def __init__(self, width, id_wid):
  22         ControlBase.__init__(self)
  23         self.pipe1 = FPDivSpecialCasesDeNorm(width, id_wid)
  24         self.pipe2 = FPDivStages(width, id_wid)
  25         self.pipe3 = FPNormToPack(width, id_wid)
  26
  27         self._eqs = self.connect([self.pipe1, self.pipe2, self.pipe3])
  28
  29     def elaborate(self, platform):
  30         m = ControlBase.elaborate(self, platform)
  31         m.submodules.scnorm = self.pipe1
  32         m.submodules.mulstages = self.pipe2
  33         m.submodules.normpack = self.pipe3
  34         m.d.comb += self._eqs
  35         return m
  36
  37
  38 class FPDIVMuxInOut(ReservationStations):
  39     """ Reservation-Station version of FPDIV pipeline.
  40
  41         * fan-in on inputs (an array of FPADDBaseData: a,b,mid)
  42         * 2-stage multiplier pipeline
  43         * fan-out on outputs (an array of FPPackData: z,mid)
  44
  45         Fan-in and Fan-out are combinatorial.
  46     """
  47     def __init__(self, width, num_rows):
  48         self.width = width
  49         self.id_wid = num_bits(width)
  50         self.alu = FPDIVBasePipe(width, self.id_wid)
  51         ReservationStations.__init__(self, num_rows)
  52
  53     def i_specfn(self):
  54         return FPADDBaseData(self.width, self.id_wid)
  55
  56     def o_specfn(self):
  57         return FPPackData(self.width, self.id_wid)