| 摘要 |
PURPOSE:To attain normal exchange even when a phase difference exists between input data by using an input clock, a clock different from a frame pulse, and a frame pulse itself so as to latch the input data thereby absorbing the phase differencd of the input data. CONSTITUTION:One frame's share of input data subject to multiplex in channels #0-#3 from an input highway 1 are fetched to an input data latch 10 by using a clock C1 and a frame pulse F1 inputted at the same time via a shift register 2. The data in the latch 10 is latched again into a data latch 11 by using a clock C2 and a frame pulse F2 generated at a part near the channel. The data are subject to exchange connection by a control memory shift register 4 and an output register 5 and read to an output highway 6. Thus, the phase difference between input data due to the difference in the length of input highways is absorbed by a time switch for one frame's share, and even when the input highway length is different between the highways, the exchange operation synchronized with the clock and frame pulse are attained. |
