Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2007-05-08
2008-11-18
Barnie, Rexford (Department: 2819)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
C710S052000, C370S902000, C370S315000, C370S492000
Reexamination Certificate
active
07454535
ABSTRACT:
A bidirectional repeater and data multiplexer for serial data has A-side I2C port devices A1-A4coupled to comparators302-308and pulldowns to ground316-322. Comparator outputs are coupled responsive to select lines S1-S4of N:l Select310to terminal A1of bidirectional control210to control pulldown to non-zero low voltage Vp206at B-side device B. An inverting comparator208coupled to terminal B1of bidirectional control210responds to input threshold voltage Vt less than low voltage Vp, to prevent data lockup due to data flowback to devices A1-A4. Output data from comparator208is coupled responsive to select lines S1-S4of 1:N Select312to control pulldowns316-322. This selectively repeats routing of device A1-A4data to device B. Data from device B is selectively routed to pulldowns of devices A1-A4.
REFERENCES:
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patent: 6952750 (2005-10-01), Cheung et al.
patent: 2001/0038674 (2001-11-01), Trans
Gai-tronics, Model IRC300A Repeater Controller Installation and Service Manual, Pub. 43004-028A, Gai-tronics Corporation, Jan. 31, 20005, entire document.
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“PCA7517: Level Translating I2C -Bus Repeater,” Philips Semiconductors, Oct. 5, 2004, pp. 2-13.
Bass Alan S
Hwang Julie A
Kim Woo Jin
Morgan Mark W
Barnie Rexford
Brady III Wade J.
Crawford Jason
Franz Warren L.
Telecky , Jr. Frederick J.
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