Method and apparatus for transferring data between data buses

Details Method and apparatus for transferring data between data buses Method and apparatus for transferring data between data buses

2005-08-16

2005-08-16

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S082000

Reexamination Certificate

active

06930514

ABSTRACT:
Systems and methods for transferring data. A circuit transfers information between two buses using different signal voltage levels and multiplexes signals applied to the second bus over multiple devices coupled thereto. The data on a first data bus is transferred at a first voltage level and the data on a second data bus is transferred at a second voltage level. For example, the first data bus may transfer data at 3.3V and the second data bus may transfer data at 5V. A logic device (e.g., a CPLD) is connected between the first and the second data buses for transferring the data between the first and second voltage levels. The logic device is also configured for multiplexing the data with the second voltage level between first and second devices (e.g., one or more LEDs and/or NVSRAMs) connected to the second data bus.

REFERENCES:
patent: 5248908 (1993-09-01), Kimura
patent: 5680063 (1997-10-01), Ludwig et al.
patent: 5877633 (1999-03-01), Ng et al.
patent: 6472903 (2002-10-01), Veenstra et al.
patent: 6762621 (2004-07-01), El-Ayat

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