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Library Definition

The code defines a library for a specific cell type used in VLSI (Very Large Scale Integration) design. Here's a detailed explanation:

General Attributes

1. library (TT_25_1.0): Defines a library named TT_25_1.0.
   • comment: An empty comment field.
   • date: The date when this library was created or last modified.
   • revision: Version of the library.
   • delay_model: The type of delay model used, in this case, table_lookup.
   • Units:
     • capacitive_load_unit (1,pf): Capacitance unit is 1 picofarad.
     • current_unit: "1mA": Current unit is 1 milliampere.
     • leakage_power_unit: "1uW": Leakage power unit is 1 microwatt.
     • pulling_resistance_unit: "1kohm": Pulling resistance unit is 1 kilohm.
     • time_unit: "1ns": Time unit is 1 nanosecond.
     • voltage_unit: "1V": Voltage unit is 1 volt.
   • Voltage Maps:
     • voltage_map (VDD, 1): VDD is mapped to 1V.
     • voltage_map (VSS, 0): VSS is mapped to 0V.
     • voltage_map (VNW, 1): VNW is mapped to 1V.
     • voltage_map (VPW, 0): VPW is mapped to 0V.
     • voltage_map (GND, 0): GND is mapped to 0V.

Default Attributes

• default_cell_leakage_power: 0: Default leakage power for cells.
• default_fanout_load: 1: Default fanout load.
• default_max_transition: 0.48: Default maximum transition time.
• default_output_pin_cap: 0: Default output pin capacitance.
• in_place_swap_mode: match_footprint: Defines the in-place swap mode.
• Thresholds:
  • input_threshold_pct_fall: 50
  • input_threshold_pct_rise: 50
  • output_threshold_pct_fall: 50
  • output_threshold_pct_rise: 50
• Nominal Conditions:
  • nom_process: 1
  • nom_temperature: 25
  • nom_voltage: 1
• Slew Rates:
  • slew_derate_from_library: 0.5
  • slew_lower_threshold_pct_fall: 30
  • slew_lower_threshold_pct_rise: 30
  • slew_upper_threshold_pct_fall: 70
  • slew_upper_threshold_pct_rise: 70

Operating Conditions

• operating_conditions (PVT_1V_25C): Defines operating conditions.
  • process: 1
  • temperature: 25
  • voltage: 1
• default_operating_conditions: PVT_1V_25C: Sets default operating conditions.

Templates

• Power Grid Current Templates:
  • pg_current_template (ccsp_template1):
    • variable_1: input_net_transition
    • variable_2: time
  • pg_current_template (ccsp_template2):
    • variable_1: input_net_transition
    • variable_2: total_output_net_capacitance
    • variable_3: time
• Lookup Table Templates:
  • lu_table_template (constraint_template_2x2):
    • variable_1: constrained_pin_transition
    • variable_2: related_pin_transition
    • Indexes: "0.008, 0.28"
  • lu_table_template (delay_template_2x2):
    • variable_1: input_net_transition
    • variable_2: total_output_net_capacitance
    • Indexes: "0.008, 0.28", "0.01, 0.3"
  • lu_table_template (mpw_constraint_template_2x2):
    • variable_1: constrained_pin_transition
    • Indexes: "0.008, 0.28"
• Power LUT Templates:
  • power_lut_template (passive_power_template_2x1):
    • variable_1: input_transition_time
    • Index: "0.008, 0.28"
  • power_lut_template (power_template_2x2):
    • variable_1: input_transition_time
    • variable_2: total_output_net_capacitance
    • Indexes: "0.008, 0.28", "0.01, 0.3"

Cell Definition (INVX1)

• cell (INVX1): Defines a cell named INVX1.
  • area: 0.684: Area of the cell.
  • Power Pins:
    • pg_pin (VDD):
      • pg_type: primary_power
      • voltage_name: "VDD"
    • pg_pin (VSS):
      • pg_type: primary_ground
      • voltage_name: "VSS"
  • Leakage Power:
    • Multiple leakage_power definitions indicating power dissipation under various conditions (e.g., when input A is high or low).
  • Leakage Current:
    • leakage_current () defines the current leakage characteristics.
    • when: "A": Specifies conditions for leakage current.
    • pg_current and gate_leakage provide details about current values and gate leakage.
  • Intrinsic Parasitics:
    • intrinsic_parasitic () defines intrinsic parasitic parameters.
    • Includes values for intrinsic_capacitance and intrinsic_resistance for both VDD and VSS.

This comprehensive breakdown covers the basic structure and significant elements of the library file, which is crucial for digital design and simulation in VLSI systems. If you have any specific questions or need further details on a particular section, just let me know!