Programmable i/o device identification

Details Programmable i/o device identification Programmable i/o device identification

H - Electricity

04

L

354/234

H04L 5/14 (2006.01) G06F 9/00 (2006.01) G06F 12/06 (2006.01)

Patent

CA 1159963

PROGRAMMABLE I/O DEVICE IDENTIFICATION Abstract of the Disclosure A computer system having a CPU connected to I/O devices via a channel for setting 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 highest ordered device in terms of priority 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 identi- fier which results in the setting of its status latch. This setting allows the next lowest ordered device to then be assigned and loaded with an identifier by the pro- cessor. This process continues until all I/O devices of the same type are loaded. The process is then repeated for each other type of I/O devices.

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