library (buslib) {
  comment                        : "";
  delay_model                    : table_lookup;
  simulation                     : false;
  capacitive_load_unit (1,pf);
  leakage_power_unit             : 1pW;
  current_unit                   : "1A";
  pulling_resistance_unit        : "1kohm";
  time_unit                      : "1ns";
  voltage_unit                   : "1V";
  library_features(report_delay_calculation);

  input_threshold_pct_rise : 50;
  input_threshold_pct_fall : 50;
  output_threshold_pct_rise : 50;
  output_threshold_pct_fall : 50;
  slew_derate_from_library : 1.0;
  slew_lower_threshold_pct_fall : 20;
  slew_lower_threshold_pct_rise : 20;
  slew_upper_threshold_pct_fall : 80;
  slew_upper_threshold_pct_rise : 80;

  default_fanout_load            : 1.0;
  default_inout_pin_cap          : 0.0;
  default_input_pin_cap          : 0.0;
  default_output_pin_cap         : 0.0;

  nom_process                    : 1.0;
  nom_temperature                : 125.00;
  nom_voltage                    : 1.62;

  operating_conditions(worst_case_industrial) {
    process  :  1.0;
    temperature  :  125.00;
    voltage  :  1.62;
    tree_type  :  "worst_case_tree" ;
  }
  default_operating_conditions : worst_case_industrial ;
  default_wire_load_mode : enclosed;

  type (bus_3_0) {
    base_type : array ;
    data_type : bit ;
    bit_width : 4;
    bit_from : 3;
    bit_to : 0;
  }
  cell (bus4) {
    pin(clk) {
      min_pulse_width_low : 0.600;
      min_pulse_width_high : 0.600;
      min_period  : 0.500 ;
      direction : input;
      clock : true ;
      capacitance : 0.0103 ;
    }
    bus (in) {
      bus_type : bus_3_0;
      direction : input ;
      capacitance : 0.007700 ;
    } 
    bus (out) {
      bus_type : bus_3_0;
      function : "in"
      direction : output ;
      timing () {
	/* 1:1 timing arcs */
	related_pin : "in" ;
	timing_sense : "positive_unate" ;
	cell_rise(scalar) {
	  values("1");
	} 
	cell_fall(scalar) {
	  values("2");
	} 
	rise_transition(scalar) {
	  values("1");
	} 
	fall_transition(scalar) {
	  values("2");
	} 
      } 
    } 
  }
}