Electronic digital logic circuitry – Interface – Current driving
Patent
1997-12-30
1999-11-02
Tokar, Michael
Electronic digital logic circuitry
Interface
Current driving
326 90, 326 30, H03K 190175
Patent
active
059777974
ABSTRACT:
Method and apparatus for transferring data on a voltage biased data line are disclosed. In one embodiment, there is provided a bus interface for controlling a differential bus having a differential data line that includes a first bus line and a second bus line. The bus interface includes a bus controller circuit, an impedance network, and a controllable biasing circuit. The bus controller circuit is coupled to the differential bus and is configured to (i) control transfer of data across the differential bus, and (ii) generate a biasing control signal prior to data transfer on the differential data line. The impedance network is coupled to the first bus line and the second bus line and is configured to substantially match a characteristic impedance of the differential data line. The controllable biasing circuit is coupled to the differential data line and is configured to (i) develop a differential biasing voltage between the first bus line and the second bus line, and (ii) to remove the differential biasing voltage from the differential data line in response to the biasing control signal.
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LSI Logic Corporation
Tokar Michael
Tran Anh Q
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