| 摘要 |
PURPOSE:To improve data transfer efficiency by storing the contents of one of a pair of registers to the register at the other side for each group of registers with the contents of the other register recovered at the other side and storing the data on a destination bus in the register at one side to send the contents of this register onto a source bus. CONSTITUTION:A basic register part 2a-1 of a register group is connected between a destination bus 11 and source buses 12 and 13. A selector 21 connected to the bus 11 is connected to a register pair 24 of registers 22 and 23 for working and back-up respectively. Then the output of the register 23 is supplied to the selector 21, and the output of the register 22 is supplied to output gates 26 and 27 connected to the buses 12 and 13. The contents of the register 22 are stored in the register 23 for each group of registers. While the contents of the register 23 are recovered to the register 23 for each group of registers. Then the data on the bus 11 are stored in the register 22 for each group of registers. At the same time, the contents of said data are outputted onto buses 12 and 13 for each group of registers.
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