| 摘要 |
PURPOSE:To make adequate automatic use of data for every application possible, by adding a flag bit in 1 bit in addition to a data storage memory and storing information of effectiveness and ieffectiveness to the bit. CONSTITUTION:When data transfer is started from a computer 1 to a data storage section 2, a control section 5 oututs data write instruction to the data storage section 2 until the transfer is finished to write the data from the computer 1 and also write a flag indicating the effectiveness of data to a flag memory. Next, the data is read from the data storage section 2 and a data processing section 6 processes data. The readout is made to the data storage section 2 and a flag memory 3 at the same time. When the readout data of the flag memory is 1, it is judged that the effective data is finished in the address, the readout is finished and a data processing end signal is transmitted to the data processing section 6. |
