Method: Origen::Registers::Bit#initialize

Defined in:
lib/origen/registers/bit.rb

#initialize(owner, position, options = {}) ⇒ Bit

Returns a new instance of Bit.



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# File 'lib/origen/registers/bit.rb', line 103

def initialize(owner, position, options = {})
  options = {
    start:                   false,        # whether bit starts a state machine so be careful
    read_data_matches_write: true,
    read:                    false,
    overlay:                 false,
    store:                   false,
    sticky_overlay:          true,
    sticky_store:            false,
    nvm_dep:                 false        # whether is an NVM dependent bit
  }.merge(options)
  @owner = owner
  @position = position
  @undefined = options.delete(:undefined)
  @reset_val = (options.delete(:res) || options.delete(:reset) || options.delete(:data) || 0)
  if @reset_val.is_a?(Symbol)
    @data = 0
  else
    @reset_val &= 1 unless @reset_val.is_a?(Symbol)
    @data = @reset_val
  end

  access_code = options.delete(:access)
  # If access has been defined then none of these other attributes can be
  if access_code
    conflicts = [:readable, :writable, :clr_only, :set_only, :w1c]
    if conflicts.any? { |k| options.key?(k) }
      puts 'The following attributes cannot be set in combination with :access'
      puts "  #{conflicts.join(', ')}"
      puts ''
      puts 'Use :access to defined the required behavior, the above attributes will be deprecated in future.'
      puts ''
      fail 'Conflicting access!'
    end
    set_access(access_code)
  else
    options = {
      writable: true,         # whether bit is writable
      readable: true,         # whether bit is readable
      clr_only: false,        # whether bit is clear only
      set_only: false,        # whether bit is set only
      w1c:      false        # whether bit is w1c (when written to 1 immediately becomes 0)
    }.merge(options)
    @readable = options.delete(:readable)
    @writable = options.delete(:writable)
    @clr_only = options.delete(:clr_only)
    @set_only = options.delete(:set_only)
    @w1c = options.delete(:w1c)
    set_access_from_rw
  end
  # Would like to get this integrated with access as well
  @read_data_matches_write = options.delete(:read_data_matches_write)

  @feature = options.delete(:feature)
  if !!feature && @writable
    @writable = enabled?
  end
  @path     = options.delete(:path)
  @abs_path = options.delete(:abs_path)
  @start = options.delete(:start)
  @read = options.delete(:read)
  @overlay = options.delete(:overlay)
  @store = options.delete(:store)
  @update_required = false
  @sticky_store = options.delete(:sticky_store)
  @sticky_overlay = options.delete(:sticky_overlay)
  @nvm_dep = (options.delete(:nvm_dep) ? 1 : 0)
  # Delete some other noise that can be left over...
  options.delete(:bits)
  options.delete(:pos)
  options.delete(:position)
  options.delete(:data)
  # Whatever is left must be custom application meta-data
  @meta = (default_bit_metadata).merge(options)
end