Autonomous selection of output buffer characteristics as determi

Details Autonomous selection of output buffer characteristics as determi Autonomous selection of output buffer characteristics as determi

1994-12-08

1997-10-14

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 30, 375257, H03K 1716, H03K 190175

Patent

active

056776390

ABSTRACT:
A mechanism determines at least an approximation of output load coupled to a programmable output buffer, and then programs the buffer to source/sink an amount of output current appropriate to the load to be driven. The mechanism includes a load recognition unit, an optional signal conditioner, and a reconfiguration logic module. In interface-governed applications, the load recognition unit senses an interface bit (AT Attachment interface), or causes the output buffer to act as a master unit that polls the interface connection to determine the number of attached loads (SCSI interface). The recognition unit then outputs a signal that may be conditioned before being input to a reconfiguration logic module that outputs appropriate control signals that program the buffer. Alternatively, the load recognition unit may measure the shunt capacitance associated with the load by using a reference current source and an analog/digital converter. The resultant voltage developed across the shunt capacitance provides a measure of the load impedance, which is used by the reconfiguration logic module to output control signals appropriately configuring the output buffer. Preferably the output buffer includes a plurality of individually-enableable unit buffers. The reconfiguration logic module can enable only such unit buffers whose current handling contributions are necessary to drive the approximated or measured load to be driven.

REFERENCES:
patent: 4684824 (1987-08-01), Moberg
patent: 5134311 (1992-07-01), Biber et al.
patent: 5319258 (1994-06-01), Ruetz
patent: 5568068 (1996-10-01), Ota et al.

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