parameterized onwrite

[benfroelich]

I am describing a trio of registers which have identical fields but with different hw, sw, and onwrite values. I use a parameterized register as a template. I instantiate it three times, once as read-only, once with woclr, and once with woset. I can't figure out how to parameterize onwrite for all three cases. I want to avoid dynamically assignments because presumably I would have to set it on every field individually. In the example below, you can see the results of Node.get_property() for each instantiation. Perhaps this is really an XY problem and there is a better way of doing this. If I reverse order of the lines default woclr = _woclr; and default woset = _woset; the issue migrates to the woset register, so it appears that having either woclr or woset set false after the other is set true overrides the true. Thanks in advance!

  // Parametrized register template
  reg reg_template #(
    accesstype _hw,
    accesstype _sw,
    boolean _woset=false,
    boolean _woclr=false
  )
  {
    default woclr = _woclr;
    default woset = _woset;
    default hw = _hw;
    default sw = _sw;
    field { } foo = 0x0;
    field { } bar = 0x0;
    field { } baz = 0x0;
  };

  // onwrite = None
  // woclr = False
  // woset = False
  reg_template #(
    ._hw(w),
    ._sw(r)
  ) read_only_reg;

  // onwrite = OnWriteType.woset
  // woclr = False
  // woset = True
  reg_template #(
    ._hw(r),
    ._sw(w),
    ._woset(true)
  ) woset_reg;

  // onwrite = None <- expect OnWriteType.woclr
  // woclr = False <- expect True
  // woset = False
  reg_template #(
    ._hw(r),
    ._sw(w),
    ._woclr(true)
  ) woclr_reg;