低压差分信号接口的优化设计

摘要

Aiming at the phenomenon of losing lock of LVDS interface in high speed and long distance transmission, the interface is optimized in both circuitry and logic. In circuitry, the differential signal driver and adaptive cable equalizer are equipped to amplify and restore the signal. In logic, through analyzing interface communication protocol, two methods are proposed to avoid the loss of lock, I.e. , sending complementary code alternately, and adding flag bit. The results of practice show that the optimized interface effectively avoids the loss of lock, ensures the reliability of the interface, and increases the speed of transmission.%针对目前低压差分信号(LVDS)接口在高速长距离传输时容易出现失锁的现象,分别从电路和逻辑两方面对接口进行了优化设计.在电路方面,通过在电路中增加差分信号驱动器和自适应电缆均衡器,对信号进行增强和恢复；在逻辑方面,通过对接口通信协议的分析,提出了交替发送反码和增加标志位两种避免失锁的方法.实测结果表明,优化后的接口不仅有效地避免了失锁现象,保证了接口的可靠性,而且也提高了接口的传输速度.