Radiation-coupled daisy chain

Details Radiation-coupled daisy chain Radiation-coupled daisy chain

1987-04-27

1989-08-08

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455603, 455613, 34082552, 370 92, H04B 900, H04J 324

Patent

active

048560910

ABSTRACT:
In a processing system (FIG. 1), peripheral boards (101-103) interconnected by a stack bus with a system board (100) each have an optical emitter (163) mounted on one face and an optical detector (162) mounted on the other face. The system board has an optical emitter mounted thereon. Emitters and detectors are arranged in a daisy-chain fashion: the emitter of one board faces the detector of the next board. To assign I.D.s (e.g. addresses) to boards, the system board turns on its emitter and transmits on the bus an I.D. The adjacent board's detector is illuminated and causes the board to latch the I.D. The system board turns off its emitter, signals the adjacent board to turn on its emitter, and transmits another I.D. on the bus. The next board's detector is thus illuminated and causes the board to latch the I.D. The system board performs the procedure for each peripheral board.

REFERENCES:
patent: 4063083 (1977-12-01), Cathey et al.
patent: 4635192 (1987-01-01), Ceccon et al.
patent: 4660141 (1987-04-01), Ceccon et al.
patent: 4720634 (1988-01-01), D'Auria et al.
patent: 4742572 (1988-05-01), Yokoyama
H. Iida et al., "Method of LSI Personalization After Resetting", IBM Technical Disclosure Bulletin, vol. 27, No. 7A, (12-84), p. 3976.
S. P. Joshi, "Making the LAN Connection With a Fiber Optic Standard", Computer Design, (9-1-85), pp. 64-69.

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