START REQUEST ACCEPTING METHOD

PURPOSE:To control an input/output device without discriminating start requests from plural processors by treating IO control from CPU as the same as memory access and register access. CONSTITUTION:In an input/output controller IOC, a start reception part 1 receives the start requests from CPU throu...

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Bibliographic Details
Main Authors KANAZAWA NOBUHARU, UEMORI AKIRA, ISHIKAWA YASUHIRO, ORUI SHUN
Format Patent
LanguageEnglish
Published 25.03.1992
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:PURPOSE:To control an input/output device without discriminating start requests from plural processors by treating IO control from CPU as the same as memory access and register access. CONSTITUTION:In an input/output controller IOC, a start reception part 1 receives the start requests from CPU through a start register 11, executes a start processing by an internal processing and reports a start processing result to request source CPU in a report control part 2 through a report register 12. At that time, the start requests generated in respective CPU are generated by the formation of the start request CPUID showing request source CPU and data. In IOC, a start reception queue register 13 in the reception pat 1 accumulates the start requests received in the register 11 and reads them. Thus, start processings for CPU are executed based on the start requests CPUID and a report register group 14 in the control part 2 accumulates a start processing result based on the start requests CPUID, reads them for respective CPU and gives information on the requests to request source CPU through the register 12. Thus, IOC receives the start requests from any of plural processors.
Bibliography:Application Number: JP19900206738