src/soc/fu/cr/pipe_data.py

   1 from nmigen import Signal, Const
   2 from ieee754.fpcommon.getop import FPPipeContext
   3 from soc.fu.alu.pipe_data import IntegerData
   4 from nmutil.dynamicpipe import SimpleHandshakeRedir
   5 from soc.fu.alu.alu_input_record import CompALUOpSubset # TODO: replace
   6
   7
   8 class CRInputData(IntegerData):
   9     regspec = [('INT', 'a', '0:63'),
  10                ('CR', 'cr', '32')]
  11     def __init__(self, pspec):
  12         super().__init__(pspec)
  13         self.a = Signal(64, reset_less=True) # RA
  14         self.cr = Signal(32, reset_less=True) # CR in
  15
  16     def __iter__(self):
  17         yield from super().__iter__()
  18         yield self.a
  19         yield self.cr
  20
  21     def eq(self, i):
  22         lst = super().eq(i)
  23         return lst + [self.a.eq(i.a),
  24                       self.cr.eq(i.cr)]
  25
  26 class CROutputData(IntegerData):
  27     regspec = [('INT', 'o', '0:63'),
  28                ('CR', 'cr', '32')]
  29     def __init__(self, pspec):
  30         super().__init__(pspec)
  31         self.o = Signal(64, reset_less=True) # RA
  32         self.cr = Signal(32, reset_less=True, name="cr_out") # CR in
  33
  34     def __iter__(self):
  35         yield from super().__iter__()
  36         yield self.o
  37         yield self.cr
  38
  39     def eq(self, i):
  40         lst = super().eq(i)
  41         return lst + [self.o.eq(i.o),
  42                       self.cr.eq(i.cr)]
  43
  44 # TODO: replace CompALUOpSubset with CompCROpSubset
  45 class CRPipeSpec:
  46     regspec = (CRInputData.regspec, CROutputData.regspec)
  47     opsubsetkls = CompALUOpSubset
  48     def __init__(self, id_wid, op_wid):
  49         self.id_wid = id_wid
  50         self.op_wid = op_wid
  51         self.opkls = lambda _: self.opsubsetkls(name="op")
  52         self.stage = None
  53         self.pipekls = SimpleHandshakeRedir