基于单片机和FPGA的程控型逻辑分析仪设计与实现

摘要

For the purpose of meeting electronic equipments' test demand, the design realized one Logic Analyzer with 64 sample channels and 8 trigger levels based on FPGA. Firstly, this paper realized trigger-cell being of complete trigger functions, including state-triggering, edge-triggering, compulsive triggering and marked triggering, then successfully builded trigger-cells array provided with multilevel trigger functions by using shift registers and user-defined data type-structural signal array. Each trigger-cell in array can be programmable controlled, so complex logical triggering conditions are realized in Logic Analyzer. Currently, the logic analyzer is used in the process of certain electronic equipments of auto test.%针对某电子设备的自动测试需求,用单片机和FPGA实现了具有最大64路逻辑采样、8级触发识别功能的逻辑分析仪.首先用Vhdl语言实现了具有状态触发、边沿触发、强制触发和触发屏蔽功能的“触发元”,然后使用移位寄存器和自定义的“结构体信号数组”数据类型成功构建了具有多级触发功能的触发元阵列,阵列中各触发元的触发功能可独立程控,从而实现了复杂的逻辑触发条件和延迟触发功能.用这种设计方法实现的逻辑分析仪已成功应用于该设备的自动测试中.