| 摘要 |
PURPOSE:To execute scan-in of 1-byte units by adding a parity mode designating circuit and providing bits for designating a parity generate or forced mode in 1-byte unit. CONSTITUTION:Parity generated by a program of a service processor SVP1 is scanned in from, for example, a 4-byte register of memory 21 of a device 2 as a control object in byte units. In this case, a parity value is set to the first optional 4 bits of 1-byte data written from the processor SVP1 to a parity register 13. Bits which designate the parity generate mode or the parity forced mode are assigned to 4 left bits. Thus, logical ''1'' is set only in the parity forced mode and logical ''0'' is set in the other modes in accordance with bytes to execute scan-in of 1-byte units. |
