| 摘要 |
PURPOSE:To share resources between line-back and line transfer jobs and to reduce a hardware medium by using a mode control circuit to secure start/ interruption/restart functions for transfer of line-back data. CONSTITUTION:When a line-back job is needed at the time of a cache mistake, data read out of a cache memory 1 in 16 times for each transfer unit are stacked in a data stack 3 via an ECC circuit 2 after 2 cycles. Then a line-back job is carried out through a bidirectional bus 14 set in a line-back permission mode. If the preparations are ended for the line transfer of a main memory 11 at a time point when the transfer is finished with a 13th line-back transfer unit, the bus 14 is switched to a line-back permission mode again. Then remaining line-back transfer units in the stack 3 are transferred to a main memory writing stack 10. In such a way, the bus 14 and the circuit 2, etc., are shared for both line and line-back transfer jobs so that the quantity of hardware is reduced.
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