Repeat CCW count argument for device command word processing

Details Repeat CCW count argument for device command word processing Repeat CCW count argument for device command word processing

2008-08-11

2010-10-19

Tsai, Henry W (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Concurrent input/output processing and data transfer

C370S393000, C370S479000

Reexamination Certificate

active

07818472

ABSTRACT:
A method of packaging a plurality of repeating commands for device command word (DCW) processing in a computer environment having an I/O link handling complex instruction chains for a processing operation is provided. Locate record information is packaged into DCW prefix parameter data. The locate record information includes an intent count argument. The plurality of repeating commands are embedded as a truncated concatenation to the first locate record information. The plurality of repeating commands are identified by redefining the intent count argument for the plurality of repeating commands as a repeat count argument using a flag argument incorporated into the locate record information. The repeat count argument indicates a number of times for a control unit in the computer environment to execute the plurality of repeating commands.

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