Input-output interface circuit with multiplexers selecting an ex

Details Input-output interface circuit with multiplexers selecting an ex Input-output interface circuit with multiplexers selecting an ex

1996-01-29

1999-09-28

Dung, Dinh C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

712 1, 326 38, H03K 19173, G06F 1300

Patent

active

059580216

ABSTRACT:
An input-output interface circuit operative in three different modes which utilizes a first signal selector, operative selectively in an external signal output mode and an internal signal transmission mode, having one output terminal to which a signal is transmitted from a signal processor and first and second output terminals, a second signal selector, operative selectively in an external signal input mode and an internal signal transmission mode, having one output terminal through which a signal input to the signal processor is transmitted and first and second output terminals, the first output terminal of the first signal selector being connected to the external input-output terminal by an external output signal transmission channel; the second output terminal of the first signal selector being connected to the first input terminal of the second signal selector by an internal signal transmission channel; and the external input-output terminal being connected to the second input terminal of the second signal selector by an external input signal transmission channel.

REFERENCES:
patent: 4969121 (1990-11-01), Chan et al.
patent: 4987319 (1991-01-01), Kawana
patent: 5317210 (1994-05-01), Patel
Pathak et al. "A 20ns CMOS Programmable Logic Device for Asynchronous Applications", Custom Integrated Circuits Conf. 1988.

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