| 摘要 |
PURPOSE:To improve use efficiency of a memory section by invalidating commands when a normal read command and a write command for an address in which partial writing is being performed are issued and preventing distortion of data. CONSTITUTION:Read-out and write-in operation are performed during partial writing operation. This operation interval is an operational time of a data correcting circuit 10 and a partial writing control section 1, and affords sufficient operational time for a memory section 8. Then, an address monitoring circuit 3 monitors a memory address, other than an executive address, a selector 4a selects an address 20, a selector 4b selects write data 21, normal read-out and write-in are performed by a memory control signal 23 generated by a memory control signal generating circuit 2 when a normal read command and or write command is issued, and distortion of data is prevented. Also, a normal read or write command exists in the address, the circuit 3 reports occurrence of an error by an error report signal 25, invalidates these commands, distortion of data can be prevented and use efficiency of the memory section 8 can be improved. |
