| 摘要 |
PURPOSE:To attain a rereading action when the read information is erased by providing the directivity to the reading control of a first-in first-out memory, etc. CONSTITUTION:A negative direction reading control circuit including a reading direction line 4, selectors 8 and 9, a subtractor 16, etc. is provided to the reading control of a buffer memory 13. Thus the reading address direction is varied with designation of the line 4 carried out in a memory reading mode. This secures the memory rereading function and a decrement function of the reading address. Therefore the reading information can be transmitted again to the software by carrying out a rereading action when the reading address is erased due to a software mistake, etc.
|
