Control interface for transferring data between a data...

G - Physics – 06 – F

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354/233

G06F 13/12 (2006.01) G06F 5/06 (2006.01) G06F 13/28 (2006.01)

Patent

CA 1299759

A B S T R A C T The IBM 370 Input/Output (I/O) architecture separates I/O devices very strictly from the central processing unit and its main memory. The I/O devices can access the memory only through the channel which takes care that only accesses to authorized spaces are performed. The invention provides a control intèrface that allows the I/O devices to communicate with the memory directly. The memory space available for data transfer is provided to the l/O devices by two continuously running transfer mechanisms one for inbound and one for outbound data transfer traffic. These mechanisms provide a series of buffers which are con- trolled by pointers indicating which buffers are full and which ones are empty. The current pointer values are ex- changed between an application and an I/O device by a third continuously running mechanism. Pointers changed are re- cognized by the application or by the I/O device control. The software can get control after a data transfer operation has been completed by using an interrupt mechanism. The interrupt mechanism can be tuned by the application by specifying threshold values and timers. GE 986 020

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