src/ieee754/fsgnj/pipeline.py

   1 """IEEE754 Floating Point Conversion
   2
   3 Copyright (C) 2019 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   4 Copyright (C) 2020 Michael Nolan <mtnolan2640@gmail.com>
   5
   6 """
   7
   8 from nmutil.singlepipe import ControlBase
   9 from nmutil.concurrentunit import ReservationStations, num_bits
  10
  11 from ieee754.pipeline import PipelineSpec, DynamicPipe
  12
  13 from ieee754.fsgnj.fsgnj import FSGNJPipeMod
  14
  15
  16 class FSGNJStage(DynamicPipe):
  17     """ FPConversion and De-norm
  18     """
  19
  20     def __init__(self, in_pspec):
  21         stage = FSGNJPipeMod(in_pspec)
  22         in_pspec.stage = stage
  23         super().__init__(in_pspec)
  24
  25
  26 class FSGNJBasePipe(ControlBase):
  27     def __init__(self, pspec):
  28         ControlBase.__init__(self)
  29         self.pipe1 = FSGNJStage(pspec)
  30         self._eqs = self.connect([self.pipe1, ])
  31
  32     def elaborate(self, platform):
  33         m = ControlBase.elaborate(self, platform)
  34         m.submodules.fsgnj = self.pipe1
  35         m.d.comb += self._eqs
  36         return m
  37
  38
  39 class FSGNJMuxInOut(ReservationStations):
  40     """ Reservation-Station version of FPCVT pipeline.
  41
  42         * fan-in on inputs (an array of FPBaseData: a,b,mid)
  43         * converter pipeline (alu)
  44         * fan-out on outputs (an array of FPPackData: z,mid)
  45
  46         Fan-in and Fan-out are combinatorial.
  47     """
  48
  49     def __init__(self, in_width, num_rows, op_wid=2):
  50         self.op_wid = op_wid
  51         self.id_wid = num_bits(num_rows)
  52
  53         self.in_pspec = PipelineSpec(in_width, self.id_wid, self.op_wid)
  54
  55         self.alu = FSGNJBasePipe(self.in_pspec)
  56         ReservationStations.__init__(self, num_rows)