src/ieee754/pipeline.py

   1 # SPDX-License-Identifier: LGPL-2.1-or-later
   2 # See Notices.txt for copyright information
   3
   4
   5 class PipelineSpec:
   6     """ Pipeline Specification base class.
   7
   8     :attribute width: the IEEE754 FP bitwidth
   9     :attribute id_wid: the Reservation Station muxid bitwidth
  10     :attribute op_wid: an "operand bitwidth" passed down all stages
  11     :attribute opkls: an optional class that is instantiated as the "operand"
  12
  13     See ieee754/fpcommon/getop FPPipeContext for how (where) PipelineSpec
  14     is used.  FPPipeContext is passed down *every* stage of a pipeline
  15     and contains the Reservation Station multiplexer ID as well as
  16     an optional "operand".  This "operand" may be used to *change*
  17     the behaviour of the pipeline.  In RISC-V terminology it would
  18     typically be set to e.g. funct7 or parts thereof.
  19
  20     """
  21
  22     def __init__(self, width, id_width, op_wid=0, opkls=None):
  23         """ Create a PipelineSpec. """
  24         self.width = width
  25         self.id_wid = id_width
  26         self.op_wid = op_wid
  27         self.opkls = opkls
  28         self.core_config = None
  29         self.fpformat = None
  30         self.n_comb_stages = None