G - Physics – 06 – F
Patent
G - Physics
06
F
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
548402
Dutke Karl-Heinz
Gould Joel
Perchik James
International Business Machines Corporation
Rosen Arnold
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