Tandem Computers Incorporated

Data General Corporation

Stephen W Hamilton

Cheng-Gang Kong

Walter E Gibson

Philip C Wong

A scannable logic unit includes one or more storage registers that maintain copies of data communicated from the scannable unit to registers in a nonscannable unit. When the scannable unit is subjected to a scan test, the registers will contain state information respecting that transfer to the nonscannable unit. When the scannable and nonscannable units are placed in a run condition, the registers supply to the nonscannable unit state information for continuing operation.

Method and apparatus for including the states of nonscannable parts in a

A variable timing sequencer for producing sets of data which correspond to different current states of the sequencer, wherein the interval of each such set of data corresponds to said current state and user input, and said current state is determined by a previous state and input data. This separation of the time domain sequencing from the functional sequencing allows operation of functional components at lower frequencies than the timing components and the increase of effective memory density. The ability to affect both current state and interval by means of an input permits the sequencer to be used in a variety of conditions and applications with a minimum amount of reprogramming.

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Los Gatos, CA, United States of America

Stephen W Hamilton