| 摘要 |
PURPOSE:To improve a data transfer speed, and to execute easily write and read-out of transfer data by providing a data transfer device constituted of a pair of dual port memories, a switching circuit, a switching controlling circuit, etc. CONSTITUTION:A block memory B12 of a dual port memory 6, and a block memory B22 of a dual port memory 7 are connected to a transmission bus 5 and a system bus 4, respectively. In this case, data transferred to a controller 1 from a controller 2 is received by the circuit B12. When it is confirmed that there is no error with regard to this data, switching of the bus is executed by a switching controlling circuit 10 and switching circuits 8, 9, and the circuit B12 and the circuit 22 are connected to the bus 4 and the bus 5, respectively. As a result, the data received by the circuit B12 is read out through the bus 4, and also the circuit B22 can be prepared for receiving the data. In this way, a data transfer speed is improved, and write and read-out of a transfer data can be executed easily. |
