| 摘要 |
PURPOSE:To prevent the overrun and the underrun of data, by providing a transmission first in first out (FIFO) quenue controlled to fill with data and a receiving FIFO queue controlled to be empty of data. CONSTITUTION:Data is transferred between a transmission FIFO queue 240 and a receiving FIFO queue 250 and a data transmitting and receiving circuit 220 synchronously with timing signals ST' and RT' generated by a timging generating circuit. The transmission FIFO queue has a function which detects whether it is filled up with transmission queuing data or not, and the detection signal is applied to the timing generating circuit to stop the generation of the timing signal ST'. The receiving FIFO queue has a function which detects whether stored contents are zero or not, and the detection signal is applied to the timing generating circuit to stop the generation of the timing signal RT'. |
