Digital audio system on a chip

Details Digital audio system on a chip Digital audio system on a chip

2006-10-31

2006-10-31

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

C326S041000, C326S038000, C326S082000

Reexamination Certificate

active

07129743

ABSTRACT:
A GPIO cell of a SOC functions, in a first state, to pass an output signal from one of plurality of modules of the SOC to a pin when an output enable signal is activated. The GPIO cell further functions, in a second state, to pass an alternate output signal from another one of the plurality of modules of the SOC to the pin when the output enable signal is activated. The GPIO cell further functions, in a third state, to pass the output signal to the pin when an alternate output enable signal is activated. The GPIO cell further functions, in a fourth state, to pass the alternate output signal to the pin when the alternate output enable signal is activated. The GPIO cell further functions, when the output enable signal or the alternate output enable signal is deactivated, to receive an input signal from the pin.

REFERENCES:
patent: 2004/0068535 (2004-04-01), Subbiah et al.
Product Data Sheet, STMP3400 Audio Decoder with USB Interface and Voice Record, Mar. 1, 2001—SigmaTel, Inc.

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