International Business Machines Corporation

Kenneth A Moe

Lloyd S Heim

Anthony Richard Bonaccio

Neil Clair Berglund

Brent Allen Carlson

Steven A Schmitt

David E Aakre

Douglas J Abrahamson

Vincent A Bettermann

A differential transceiver transmission line integrity detector detects both open and short circuits in the transmission lines. The two transmission lines are terminated at both ends by selected impedances. A driver coupled to each of the transmission lines drives the lines with data signals. Signal levels on the lines are detected and compared with expected levels to generate line integrity indications. Both open and short conditions are detected and indicated by the line integrity indications.

Differential transceiver with line integrity detection

An automatic address assignment system has a plurality of I/O devices coupled to a bus. Each device contains a unique machine-readable identifier which is used to select the device for address assignment. The identifier is a binary bit string. Each bit position in the bit string is selected by the host in a serial manner with the host specifying which binary value is being solicited. All devices whose identifier digit matches the solicited value respond positively and remain in contention for address assignment. The other devices will not respond and drop out of contention for address assignment until the sequence is restarted from the first bit. After the bit sequence is completed, the address for that device is bused to the device, and the sequence is restarted from the first bit until all devices have been assigned an address.

Automatic I/O address assignment

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Los Gatos, CA, United States of America

Kenneth A Moe