基于ARM和FPGA的LXI触发机制实现

LXI trigger mechanism implementation based on ARM and FPGA

触发是保证自动测试系统中设备间同步运作的一种有效机制,对于完善自动测试系统的功能有着重要意义。LXI规范一共提出了5种LXI设备触发方式,为了实现这些触发方式,根据LXI触发模型,提出了一种基于ARM处理器和FPGA的实现方法,并且详细讨论了该方法中的FPGA逻辑设计和ARM软件设计。经过测试验证,使用该方法能够实现LAN触发、同步时钟触发和硬件线触发的功能,并且同步时钟触发方式能达到120ns的触发精度,硬件触发方式能达到25ns的触发精度。

The trigger is an effective mechanism to guarantee synchronous actions between instruments in an automatic test system and it has important significance for improving the functions of automatic test system.The LXI specification has proposed a total of five LXI devices trigger mode,in order to achieve these trigger mode,this thesis proposes a method based on ARM and FPGA refer to the LXI trigger model.In addition,it discusses the FPGA logic design and ARM software design in detail of this method.The actual test indicates that LAN trigger,time-based trigger and LXI trigger are achieved through this method,also time-based trigger has a precision of 120 ns and LXI trigger has a precision of 25 ns.