| 摘要 |
PURPOSE:To simplify the control of a memory method and to reduce its cost by providing an empty memory which is stored with information on an address, where a buffer memory writes data, by receiving a command from an address counter. CONSTITUTION:On a write cycle, a write cycle command is inputted to empty memory 5 and at the same time, a write cycle clock is supplied to buffer memory 1, memory 5 and address counter 2. As a result, FF6 is reset. Simultaneously, an address signal is sent from counter 2 to memories 1 and 5, input data are written to memory 1 in sequence, and memory 5 is stored with information on an address where a write to memory 1 ends. On a read cycle, next, a read cycle clock is sent to counter 2, which reads out data from memory 1 at every time of counting up. At the same time, the data are outputted to memory 5 as well and after the final data are read out, FF6 is reset by the output of memory 5, so that the command for the read cycle end will be sent out. |
