Interface controller including hardware mechanism to handle PS/2

Details Interface controller including hardware mechanism to handle PS/2 Interface controller including hardware mechanism to handle PS/2

1997-03-07

1999-10-12

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 5, 710 49, G06F 1300, G06F 1314, H01J 300

Patent

active

059648538

ABSTRACT:
A controller handles host commands from a host processor and also interfaces the host processor to a serial device. Storage circuitry (e.g., a shift register) of the controller holds a predetermined plurality of data bits. State machine circuitry controls the storage circuitry for serial bit-level communication (e.g., using a PS/2 protocol) between the storage circuitry and the serial device. A processor executes code from a program memory. In particular, the program code causes the processor to detect that a host command has been received by the controller from the host processor and causes an action corresponding to the host command received. Because the processor is not involved with the serial bit-level communication between the storage circuitry and the serial device, the processor executing the software can handle host commands without affecting the serial bit-level communication.

REFERENCES:
patent: 5381530 (1995-01-01), Thayer et al.
patent: 5608889 (1997-03-01), Werlinger et al.
PC87570 Keyboard and Power Management Controller, National Semiconductor, rev. 1.00, Oct. 1996.

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