Universal serial bus keyboard control circuitry

Details Universal serial bus keyboard control circuitry Universal serial bus keyboard control circuitry

2006-09-05

2006-09-05

Chow, Dennis-Doon (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

C341S022000

Reexamination Certificate

active

07102619

ABSTRACT:
A keyboard control apparatus with a USB interface for use in a notebook computer having a number of keys. In one embodiment, a mapping unit is employed to store a number of key matrix codes corresponding to the keys. In accordance with a clock signal and a start signal, a shift register is capable of generating a reference signal and a number of scan output signals. A key matrix circuit then receives the scan output signals to provide a number of scan input signals. An address generator is used to generate an address signal based on the reference signal and a triggered scan input signal. Thus, a selector can select one key matrix code designated to the address signal from the mapping unit. Additionally, an interface converter further converts the selected key matrix code into a pair of differential signals compliant with the USB specification.

REFERENCES:
patent: 6630895 (2003-10-01), Dong
patent: 6859150 (2005-02-01), Kuo et al.
patent: 6903727 (2005-06-01), Mambakkam et al.

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