src/soc/fu/mul/pipe_data.py

   1 from soc.fu.mul.mul_input_record import CompMULOpSubset
   2 from soc.fu.pipe_data import FUBaseData, CommonPipeSpec
   3 from soc.fu.div.pipe_data import DivInputData, DivMulOutputData
   4 from nmigen import Signal
   5
   6
   7 class MulIntermediateData(DivInputData):
   8     def __init__(self, pspec):
   9         super().__init__(pspec)
  10
  11         self.neg_res = Signal(reset_less=True)
  12         self.neg_res32 = Signal(reset_less=True)
  13         self.data.append(self.neg_res)
  14         self.data.append(self.neg_res32)
  15
  16
  17 class MulOutputData(FUBaseData):
  18     def __init__(self, pspec):
  19         super().__init__(pspec, False) # still input style
  20
  21         self.neg_res = Signal(reset_less=True)
  22         self.neg_res32 = Signal(reset_less=True)
  23         self.data.append(self.neg_res)
  24         self.data.append(self.neg_res32)
  25
  26     @property
  27     def regspec(self):
  28         return [('INT', 'o', "0:%d" % (self.pspec.XLEN*2)), # 2xXLEN
  29                ('XER', 'xer_so', '32')] # XER bit 32: SO
  30
  31
  32 class MulPipeSpec(CommonPipeSpec):
  33     regspecklses = (DivInputData, DivMulOutputData)
  34     opsubsetkls = CompMULOpSubset