Universal serial bus keyboard system

Details Universal serial bus keyboard system Universal serial bus keyboard system

1995-07-25

1998-09-01

Auve, Glenn A.

395868, 395733, 395500, G06F 300, G06F 946

Patent

active

058023186

ABSTRACT:
A keyboard system according to the present invention includes a serial bus host controller coupled to a serial bus keyboard. The keyboard includes both keyboard scan logic and scan code conversion logic for passing to the host controller over the serial bus. The host controller includes circuitry for processing the data between the serial bus and a host bus. The host controller further includes 8042 emulation logic for providing a hardware compatible interface to the keyboard controller. The 8042 emulation logic also includes circuitry for communicating over the serial bus during times when the serial bus has not yet been initialized.

REFERENCES:
patent: 4578671 (1986-03-01), Flowers
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 5590315 (1996-12-01), Hess et al.
Pentium.TM. Processor User's Manual vol. 3: Architecture and Programming Manual by Intel.RTM., 1993 (Chapters 1-4, 9-15, 20 and 22).
Microprocessor and Peripheral Handbook vol. II Peripheral by Intel.RTM., 1988, pp. 5-55 to 5-74.
Universal Serial Bus Specification by Compaq, Digital Equipment Corporation, IBM PC Company, Intel, Microsoft, NEC, Northern Telecom, Revision 0.9, Apr. 13, 1995.
ACCESS.bus .TM. microcontroller 83C542/87C542 Phillips Semiconductors Objective Specification, pp. 1-22, Apr. 3, 1995.

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