Patents Represented by Attorney, Agent or Law Firm Louis D. Carter
  • Patent number: 6728647
    Abstract: A method of estimating a capacitance of each resource in a programmable logic device (PLD) is described. The current drawn by a reference circuit implemented in the PLD is measured at a given frequency and operating voltage. The capacitance of the reference circuit is calculated using the current drawn, the frequency, and the operating voltage. The current drawn by a resource load coupled to the reference circuit is measured at the given frequency and operating voltage. The capacitance of the resource load coupled to the reference circuit is calculated using the current drawn, the frequency, and the operating voltage. The capacitance of the resource load may be calculated by subtracting the capacitance of the reference circuit from the capacitance of the resource load coupled to the reference circuit.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: April 27, 2004
    Assignee: Xilinx, Inc.
    Inventors: Suresh Sivasubramaniam, Siuki Chan