Texas Instruments Corporation

3 Com Corporation

Brett Walter Chaveriat

Ronald Joseph Sullivan

Ron Rotstein

Robert C Suffern

Daniel G Prysby

Khodor S Elnashar

A method and apparatus for compensating for input threshold variations in input buffers is provided. The method and apparatus compensate for input threshold variations by applying a bias voltage on a known capacitance of an RC calibration circuit using, for example, a pulse width modulator. The bias voltage helps ensure that the time to charge the known capacitance from the bias voltage to the input threshold voltage of the input buffer is independent of the threshold voltage. The bias voltage is chosen using an iterative process in which the time to charge from the bias voltage to the threshold voltage is compared with a reference time. The bias voltage is adjusted based on the comparison.

Method and apparatus for compensating input threshold variations on input buffers

A processor on an add-on card that arbitrates demand on a memory unit on the add-on card. The processor and memory unit are used for the underlying functionality of the add-on card. The processor determines an appropriate time to allow interface operations to the memory unit when the memory unit is not already being accessed for the underlying functionality of the card. By using the processor and memory unit on the add-on card for interface operations to the host computer, the add-on interface circuitry on the add-on card can be minimized and simplified.

System for arbitrating demand on memory during configuration of a

Growing community of inventors

Arlington Heights, IL, United States of America

Brett Walter Chaveriat