| 摘要 |
PURPOSE:To guarantee the sequence of write-in and readout access of the main storage device to the same data, by registrating the access information registered in write-in buffer, on an address information storage means. CONSTITUTION:When a write-in buffer control section 23 makes a write-in access request, a lower rank bit 231 of a main storage address designates an address 201 of an address array 30 via a selection circuit 31, the content of bits on a bus 230 is applied to an effective bit control circuit 34, and the effective bit of the block of the address array 30 is reset. With this operation, when the write-in access to a block data not registrated in a cash memory 50 is registrated to a write-in buffer 60, if a readout request from an instruction control section 1 to the data comes, the readout access to a main storage device 3 is made after the write-in access of the write-in buffer is finished. |
