Programmable I/O device identification

Details Programmable I/O device identification Programmable I/O device identification

1980-07-30

1982-11-23

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 906

Patent

active

043608701

ABSTRACT:
A computer system having a CPU connected to I/O devices via a channel sets addresses into the I/O devices by the CPU. The I/O devices, for purposes of control, are grouped in types. To load device addresses or identifiers, the processor sends a type identifier to the I/O devices. The device having the highest ordered priority of the same type of device and which does not have an assigned identifier responds by inhibiting all lower ordered devices of its type. It is then loaded with its unique assigned identifier which results in the setting of a status latch therein. This setting allows the next lowest ordered device of the same type of devices to then be assigned and loaded with an identifier by the processor. This process continues until all I/O devices of the same type are loaded with identifiers. The process is then repeated for each other type of I/O devices in the system.

REFERENCES:
patent: 3680052 (1972-07-01), Arulpragasam et al.
patent: 3828325 (1974-08-01), Stafford et al.
patent: 3909790 (1975-09-01), Shapiro et al.
patent: 4079452 (1978-03-01), Larson et al.
IBM Technical Disclosure Bulletin vol. 22, No. 3, Aug. 1979, "Programmable Identification for I/O Devices", J. M. McVey, pp. 882 and 883.

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