| 摘要 |
PURPOSE:To improve the throughput of the titled processor by switching an operation to indirect processing method so that a service processor requests the processing to an interface device to entrust the processing to the interface device and immediately opens itself. CONSTITUTION:In the indirect data loading operation, the service processor SVP stores 4-byte load data in a register ODR every two bytes through a DB line at first. Then, the SVP sends the address of a register to be loaded in body device 12 and a bit indicating the load to the DB line, sends an indirect mode signal and a selector operating signal to an AB line to enter these signals to a selector address register SAR and designates writing through an R/W line. When receiving the designation, a control circuit CNT starts data transfer to the body device through an ACK line. When an acknowledge signal ACK is returned, the SVP opens the buses.
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