Apparatus for input/output expansion without additional...

Details Apparatus for input/output expansion without additional... Apparatus for input/output expansion without additional...

2008-03-18

2008-03-18

Peyton, Tammara (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output expansion

C710S008000, C710S009000, C710S010000, C710S029000, C710S106000, C710S300000, C713S600000

Reexamination Certificate

active

10709084

ABSTRACT:
An apparatus for expanding I/O is described in which no additional strobes or enable lines are necessary from the host controller. By sequencing data in a specific way when output to two existing data or select lines, an expansion I/O device can generate a strobe or enable signal internally. This internal strobe or enable signal is then used to store output data or enable input data. The host controller needs software or firmware to perform the data sequencing, but no additional wires are needed, and no changes are needed to existing peripheral devices. Thus, an existing system can be expanded when there are no additional control lines available and no unused states in existing signals.

REFERENCES:
patent: 4689740 (1987-08-01), Moelands
patent: 6874050 (2005-03-01), Tangen
patent: 7194695 (2007-03-01), Racine et al.

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