System having different signal transfer modes for detecting and

Details System having different signal transfer modes for detecting and System having different signal transfer modes for detecting and

1993-04-21

1996-06-04

Lee, Thomas C.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

395306, 395280, 395500, 395834, 455 261, 36492793, 3642402, 364135, 3642216, G06F 1300, G06F 1320

Patent

active

055242170

ABSTRACT:
To enable wired-OR signal lines to be connected without interlock in a bus linkage unit for connecting the bus of a computer system with the bus of an expansion device or the bus of another computer system through a signal transfer path in which the signal mode is different from those of the buses. A shadow register 46 that acts on the level of wired-OR signal line 51 of the other bus is provided in each system. The level of wired-OR signal lines in each system is sent to the shadow register of the other system through a communication path. When the shadow register of the system is at a predetermined level, said system will not send the level of said wired-OR signal line to the other system. Interlock is eliminated by avoiding repetition of level transfer echoes between both systems in this way. Both systems are further provided with a shadow-shadow register 47 for forming a mirror image of the shadow register of the other system. A predetermined level will be sent to the shadow register of the other system based on the nonconformity between the level of the shadow-shadow register in each system and the level of wired-OR signal line of said system.

REFERENCES:
patent: 4311963 (1982-01-01), Watanabe et al.
patent: 5014284 (1991-05-01), Langer et al.
patent: 5101477 (1992-03-01), Casper et al.
patent: 5257289 (1993-10-01), Jopson
patent: 5289459 (1994-02-01), Brownlie
International Business Machines Technical Disclosure Bulletin: vol. 28, No. 6, pp. 2346-2347, "Stackable Unit Packaging Concept" (Nov. 1985).
International Business Machines Technical Disclosure Bulletin: vol. 26, No. 10A, pp. 5147-5152 "Extended Data Bus with Direction and Enable Control Features" (Mar. 1984).
International Business Machines Technical Disclosure Bulletin: vol. 19, No. 8, pp. 3139-3143, "Serial Channel to I/O Interface" Jan. 1977.
"Analysis of a GaAs E-D Inverter Chain", Omar Wing, 1989, IEEE, pp. 1141-1144.

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