| 摘要 |
PURPOSE:To enable the independent readout of transmission data, by initializing the writing address of a memory with the head pulse of an effective part of end office data and setting the memory of the writing side under a write-enable- state for a section of the transmission data to be written. CONSTITUTION:A writing address counter 2a or 2b of a memory 1a or 1b is initialized by the head pulse of effective end office data 6. At the same time, a memory of the writing side is set under a write-enable-state for a section of transmission data to be written. Then a reading address counter 2b or 2a of the memory 1b or 1a is initialized with a pulse 16 which is obtained by differentiating the rise edge of an alloted burst designating signal 14 through a differentiating circuit 15. Thus a transmission data 9 can be read out of a memory regardless of the writing timing of the data 6 to the memory and with the timing and the time width of the signal 14. |
