Texas Instruments Corporation

Sridhar Vajapey

Luat Q Pham

Paul William Krause

John M Bach

An integrated circuit is provided having a core circuit for performing a plurality of functions, a first pad for receiving an emulator output signal, a pulldown device connected to said first pad, a first logic circuit having an input connected to said first pad and an output signal for enabling emulator signals, a first plurality of second pads for receiving emulator signals, and a first plurality of second logic circuits with each circuit having a first input individually connected to one of said second pads, having a second input connected to said output signal from said first logic circuit, and having an output connected to a portion of said core circuit.

Method for configuring an integrated circuit for emulation with optional

An output buffer 10 of an integrated circuit controls the slew rate of an output signal in order to minimize electro-magnetic interference. Transient current delay circuits 132 and 134 provide a delay between turning off pull down circuit 122 and turning on pull up circuit 124, and vice versa, in order to assure that driver overlap does not occur. Pull up circuit 124 selectively switches a plurality of output transistors P(n) in order to control the rise time of an output signal. Likewise, pull down circuit 122 selectively switches a plurality of output transistors N(n) in order to control the fall time of an output signal so that current spikes on supply lines to output buffer 10 are reduced or eliminated.

CMOS output buffer with slew rate control

This is a method and apparatus for waking up an integrated circuit 10 which has been placed into a low power mode in response to an idle instruction or the like. A plurality of wakeup reset signals 320 and wakeup interrupt signals 330 are provided to wakeup circuitry 300 in order to initiate a wake-up process. Wakeup circuitry 300 conditions signals 320 and signals 330 so that a wake-up process is initiated only when the integrated circuit is in a low power mode; therefore, signals 320 and signals 330 can be used for other purposes when the integrated circuit is not in a low power mode. By such conditioning, no additional pins are required on integrated circuit 10 to provide a plurality of wake-up stimuli.

Method for waking up an integrated circuit from low power mode

Apparatus for selective operation without optional circuitry

A multifunction data storage register is provided having at least one first register cell having a first input multiplexer for selecting between two input signals responsive to one or more control signals and having a first output signal, a first input exclusive not OR circuit having a first input connected to said first output signal of said first input multiplexer and a second input connected to a cell output signal and having a third output signal, a first shift register latch having an input connected to said third output signal of said first input exclusive not OR circuit and having a fourth output signal, a first output exclusive not OR circuit having a first input connected to said fourth output signal of said first shift register latch and a second input connected to a feedback signal and having a fifth output signal, and a first output multiplexer for selecting between said fifth output signal and said fourth output signal responsive to said one or more control signals and having a first cell output signal, and at least one second register cell having a second input multiplexer for selecting between two input signals responsive to said one or more control signals and having a seventh output signal, a second input exclusive not OR circuit having a first input connected to said seventh output signal of said second input multiplexer and a second input connected to a cell output signal and having an eighth output signal, and a second shift register latch having an input connected to said eighth output signal of said second input exclusive not OR circuit and having a second cell output signal.

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Sugarland, TX, United States of America

Sridhar Vajapey