基于可编程逻辑器件的井下板间高速串行数据传输电路设计

Design on A CPLD-based High-speed Serial Data Transmission Circuitry for Inter-boards of Downhole Tool

设计了一种井下板间高速串行数据传输总线电路,其发送与接收控制器均用复杂可编程逻辑器件(CPLD)实现,传输速率为5 Mbit/s,传输过程不需要井下控制CPU的干预。电路结构紧凑,控制灵活,适合于井下仪器各分系统内部的板间数据高速传输,可在保证较高通讯带宽的前提下,大大减少连线,显著提高系统的电磁兼容性能。

Designed is an inter-boards high-speed serial data transmission circuitry of downhole tool. Its transmitting and receiving controllers are implemented with Complex Programmable Logical Device （CPLD）. Its transmission rate is 5 Mbit/s. The CPU for controlling downhole tool does not step in its transmission. The circuitry has advantages of compact structure, flexibility to be controlled and suitability for inter-boards high-speed data transmission of downhole tool. The circuitry can afford high communication bandwidth, reduce linking wires and improve electromagnetism compatibility of the system.