The inimitable merits of USB are introduced into the GPIB automatic testing system and the GPIB controller with the USB bus and the VISA function lib is designed and developed.
将USB所具有的独特优点引入到以GPIB为标准的自动测试系统中，设计并开发了具有USB总线的GPIB接口控制器和性能较为完善的VISA函数库，介绍了所设计的GPIB控制器VISA标准函数的格式与功能。
A boundary scan controller with the USB interface is designed. DSP and 74lvt8980 are adopted to control the boundary scan bus.
采用DSP和边界扫描总线控制芯片74lvt8980设计边界扫描测试控制器。
PDIUSBD12 may be used for implementing the interface between the parallel bus of the micro-controller and USB. With PDIUSBD12, users can implement multiple classes of USB functions.
PDIUSBD 12芯片能够实现微控制器的并行总线到总线的接口功能，使用芯片可以实现多种类型的外设。
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