Communication multiplexer sharing a free running timer among mul

Details Communication multiplexer sharing a free running timer among mul Communication multiplexer sharing a free running timer among mul

1983-07-18

1984-11-13

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1300

Patent

active

044829825

ABSTRACT:
A data processing system includes a central processing unit, a main memory, and a communication subsystem servicing a number of communication lines. The communication subsystem includes a free running timer, a line microprocessor for communicating with the communication lines and a shared memory, and an I/O microprocessor for communicating with the shared memory and the central processing unit and main memory. The line microprocessor, desiring to communicate with a specified communication line after a predetermined time delay, loads a first mailbox in shared memory with a binary number indicative of the predetermined time delay. The I/O microprocessor adds the output of the free running timer to the binary number, stores the result in a location in a random access memory, and periodically compares the result against the free running timer output. The I/O microprocessor loads a second mailbox with a control character when the results of the comparison indicate that the predetermined time delay is accomplished. The line microprocessor responds to the information in the second mailbox to communicate with the specified communication line.

REFERENCES:
patent: 3408629 (1968-10-01), Haselwood
patent: 3633181 (1972-01-01), Sikorsky
patent: 4090239 (1978-05-01), Twibell et al.
patent: 4133030 (1979-01-01), Huettner et al.
patent: 4220990 (1980-09-01), Alles

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