Cirrus Logic Inc.

Atari Games Corporation

David Sherman

Kaushik L Popat

William Ip

Voltage pullup or pulldown devices of general purpose input/output pads of integrated circuit chips are controlled by signals derived from a core of the chip and which indicate (1) if the pad is to be enabled to output a value and (2) the value of the signal to be outputted. Such devices are controlled to supply different current levels to the input/output terminals as a function of whether the chip is operating in 'sleep' and interrupt modes. The device of each pad is disabled when signals or commands are supplied via the pad from the chip to circuitry external to the chip and vice versa.

Integrated circuit with input/output pad having pullup or pulldown

A memory cell and array of memory cells specially adapted for support of bit serial math for low cost CAD workstations. The memory cell is comprised of a multiplexer which selects between several inputs for application of data to a bit storage cell of a dynamic RAM nature. Each cell multiplexer has a serial data input, a parallel data input, a parallel format pipeline data input and a recirculation data input. Each cell also has a first output which serves both as a serial data output and a pipeline data output, and a second data output which is tri-state and which is coupled to a parallel format data bus which runs through the array. A plurality of such cells are arranged in rows and columns where rows of such cells are coupled so that data may passed between the rows in either parallel format or serial format for pipeline operations and such each row can independently load data in either serial or parallel format and output data in either parallel or serial format. Ech cell has a selectable recirculation path which allows any cell or group of cells to be used as RAM or as a shifting network.

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Fremont, CA, United States of America

David Sherman