Multiple-use priority network

Details Multiple-use priority network Multiple-use priority network

1985-08-29

1987-05-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 95, 3408255, H04J 302

Patent

active

046637567

ABSTRACT:
A multiple user priority network is provided by a double section priority PROM. One section of the PROM is accessed by a current priority code stored in a priority register, and new request signals that appear on lines that are coupled to the requesting components to provide an address which contains a new access code. The second section of the PROM is accessed by the new access code, which is stored in a channel access code register, and the current priority code in the priority register to provide an address which contains a new priority code. The multiple user priority network of the present invention is thus capable of providing a updated priority for all of the requesting devices which is a function of the changes in the request status of the devices. The particular described implemented embodiment is a modified least-recently-used algorithm in which when more than one device is requesting access to a bus, the device which is currently in control will upon the initiation of the next cycle be assigned the lowest priority, and each of the other channels will have their priority increased by one.

REFERENCES:
patent: 4232294 (1980-11-01), Burke et al.
patent: 4295122 (1981-10-01), Hatada et al.
patent: 4342995 (1982-08-01), Shima
patent: 4462029 (1984-07-01), Neumann et al.
A. L. Bergey, Jr., Increased Computer Throughput by Conditioned Memory Data Prefetching, IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978, p. 4103.

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