| 摘要 |
PURPOSE:To provide the address decision system of an I/O control device which is reduced at its address setting restriction by forming an address defining storage part for storing whether the addresses of the whole sub-channels are defined or not. CONSTITUTION:A service processor 10 reads out a sub-channel NSC address related to an interface A/B and information related to an ESC address, forms the corresponding information and transfers the formed information in channel adaptors 111-11n. In each of the channel adaptors 111-11n, an SVP link control circuit 15 receives said information and sets up the information in a local storage address register 18, a local storage data register 17 and a local storage control register 16 on the basis of scan-in operation. When a write access indication is supplied to the register 16, the address definition information is written in the corresponding position. An address decision circuit 21 reads out the contents of the corresponding in a local storage 20 and decides the contents. |
