Patent ID: 6020767
Filing Date: 2000-02-01
Classification: H03K

Abstract:
A CMOS receiver circuit cell of a receiving chip useful as a receiving circuit for receiving signals from a sending chip on cross chip boundaries for coupling chips which have different coupling requirements, comprising: a receiver circuit cell on said receiving chip having an control input line for receiving a control input from a device output level control signal from an environment coupled to said sending chip for receiving a device output level control signal (DOL) in said receiver circuit cell for chip to chip transitions, said control input from a device output level control signal (DOL) when DOL is in high state setting said receiver circuit for first hysteresis levels and when said device output level control signal (DOL) is in the low state said control input setting said receiver circuit for a second hysteresis level, said receiver circuit cell having a receiver enable pin for receiving a receiver enable signal to turn OFF power for said receiver circuit cell and to set the output of the receiver circuit cell at a predetermined deterministic state to override all prior hysteresis levels, said receiver circuit having an input pin for said control input line to take data from an off chip environment which provides said control input to the receiver circuit in accordance with the needs of said sending chip and to couple the external environment to said receiver circuit cell for processing of said data through the receiver circuit to a receiver circuit cell output, the state of said device output level control signal being configurable by control input level settings providing a capability of receiving a signal sent from said sending chip which depends upon the state of the DOL pin.