Method for determining whether bi-directional or unidirectional

Details Method for determining whether bi-directional or unidirectional Method for determining whether bi-directional or unidirectional

1996-09-06

1998-10-13

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327 18, 327603, 326 30, 326 82, H03L 500

Patent

active

058217983

ABSTRACT:
To increase compatibility, a method is used to determine whether a bidirectional or a unidirectional data line circuit is connected to an interface circuit. A first logic level is generated on a non dedicated lead of the interface circuit if a bidirectional data line circuit is connected to the interface circuit. Otherwise, a second logic level is generated on the non dedicated lead of the interface circuit. The logic level on the non dedicated lead after a reset signal determines which type of data line circuit is connected to the interface circuit. Typically the non dedicated lead is a data line lead of the interface circuit and can be used for normal data transfer, if necessary, after detecting which type of data line circuit is connected to the interface circuit.

REFERENCES:
patent: 4166963 (1979-09-01), Metcalf
patent: 4471243 (1984-09-01), Isham
patent: 5581201 (1996-12-01), Sonner et al.

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