System and method for communicating data over a high-speed bus

Details System and method for communicating data over a high-speed bus System and method for communicating data over a high-speed bus

1998-09-09

2000-10-24

Chin, Stephen

Pulse or digital communications

Synchronizers

375220, H04L 700

Patent

active

061378496

ABSTRACT:
The present invention is generally directed to a method and apparatus for transferring data from an integrated circuit that is capable of bidirectional data communication. In accordance with one aspect of the invention, an apparatus is provided having a circuit for splitting the data into two portions--a high bit portion and a low bit portion. The circuit also includes two data paths. A first data path communicates the high bit portion of the data and a second data path communicates the low bit portion of the data. The apparatus further includes an output circuit that is configured to connect outputs of the first and second data paths to a common, bidirectional data bus. Finally the apparatus includes a hold circuit configured to hold a last data value on the common data bus for at least one clock cycle before allowing circuitry to receive data from the common bus. A method is also provided for transferring data from an integrated circuit capable of bidirectional data communication. The method operates by splitting data into a first group of bits and a second group of bits. The method further includes steps of transmitting the first group of bits along a first data path, and transmitting the second group of bits along a second data path. The method then electrically connects an output of the first data path to an output of the second data path at a common directional data bus, and alternatively transmits data over the first path and the second path. When alternating the data transmissions in this way, the method ensures that the two data path outputs are not driven at the same time. Finally, the method holds a last data value on the common bus for at least one clock cycle before receiving data over the common bus.

REFERENCES:
patent: 4891806 (1990-01-01), Farias et al.
patent: 5253271 (1993-10-01), Montgomery
patent: 5691832 (1997-11-01), Liedenbaum et al.
patent: 5715280 (1998-02-01), Sandberg et al.
patent: 5787120 (1998-07-01), Louagie et al.

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