Creating an IC Die Network

If your design contains a set of pins representing connection points for an IC die, you can create an IC Die Network. Such a network consists of resistive and/or capacitive elements that model the on-chip power distribution (e.g., VDD and GND net) interconnect parasitics.

You can place a series resistance and shunt capacitance to ground at chip bumps.

To create an IC Die Network:

  1. Click Tools > Create IC Die Network.

    2. The IC Die Network Generation window appears.

  2. Select the IC Part Name from the drop-down menu.
  3. Select the reference designator from the Reference Designator drop-down menu.
  4. Select the power rail net you want to use in the network, from the Net drop-down menu.
  5. Enter a name for this network in the Network Name field.
  6. To generate a network that models the on-chip power rail interconnect parasitic resistance:
    1. Select the Generate Series Resistance check box.
    2. Enter a value for each resistor in the network in the Resistance field.
    3. Select the number of neighbors for the power rail die pin. If you choose Star Pattern, each power rail die pin is connected to 8 of its nearest neighboring pins on the same net. For Grid Pattern, the pin is connected to 4 of its neighboring pins. This distribution of uniform resistive elements serves as a reasonable approximation of the on-chip power rail resistance.
  7. To generate a network that models the on-chip capacitance between the power rail interconnect and the ground rail interconnect:
    1. Select the Generate Bypass Capacitance (Per Bump) check box.
    2. Enter a value for each capacitor in the network in the Capacitance field.
    3. Optionally, enter a value for the equivalent series resistance (ESR) assigned to each capacitor in the ESR field.
    4. Select the name of the ground rail net from the To Net drop-down menu.

    A capacitor of the specified value is introduced between each power rail pin and the nearest ground rail pin.

  8. Click Generate.

    9. The network is listed in the Existing RC Networks box.

  9. Optionally, to delete a network, select it from the Existing RC Networks box, and then click Delete Selection.
  10. Click OK.