Peripheral port with volatile and non-volatile configuration

Details Peripheral port with volatile and non-volatile configuration Peripheral port with volatile and non-volatile configuration

1993-07-14

1995-03-28

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

36518908, 327407, H03K 19173

Patent

active

054020140

ABSTRACT:
An embodiment of this invention provides an integrated circuit (IC) having a configurable peripheral port which includes an input/output pin, a multiplexer coupled to the input/output pin, volatile configuration bits to control the multiplexer, and non-volatile configuration bits to control the multiplexer and override the volatile configuration bits. One embodiment of an IC also includes a peripheral port as above and functional units, such as programmable array logic (PAL) and erasable programmable read only memory (EPROM), coupled to the multiplexer. In another embodiment, a non-volatile configuration bit from a functional unit configures an input/output pin when the configuration bit is not needed by the functional unit.

REFERENCES:
patent: 4124899 (1978-11-01), Birkner et al.
patent: 4642487 (1987-02-01), Carter
patent: 4717912 (1988-01-01), Harvey et al.
patent: 4870302 (1989-09-01), Freeman
patent: 5136188 (1992-08-01), Ha et al.
Programmable Peripherals Design and Applications Handbook, WaferScale Integrations, Inc., 1991.
Shubat, et al., A Family of User-Programmable Peripherals with a Functional Unit Architecture, IEEE Journal of Solid-State Circuits, vol. 27, No. 4, Apr., 1992, pp. 515-529.
PAL Device Data Book, Advanced Micro Devices, 1990, pp. 2-237 to 2-264.

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