Design Of LXI_VXI Zero-slot Controller Module Supporting Nanosecond Time Synchronization Accuracy

LAN-based modular test system LXI with its low-cost,high performance,high throughput characteristics gradually replacee GPIB,1394,become a new generation of industrial test bus system.In order to take advantage of the performance advantages of LXI test network and the existing VXI equipment,the best way is to build LXI-VXI integrated test network,and LXI-VXI slot controller is the key to connecting LXI network and VXI network.LAN-based LXI test network requires higher time synchronization accuracy to achieve high-precision interrupt,triggering functionIn this paper,a 1000 Mbps LXI-VXI zero-slot controller module with nanosecond precision time synchronization accuracy is designed using the time-synchronization packet at the network physical layer.The advantage is that it can be implemented at 1000 Mbps Ethernet Based on the realization of nanosecond high-precision time synchronization for the LXI-VXI integrated test network interrupt and trigger to provide higher accuracy.This paper studies the transplant of the embedded operating system uc-linux to the LXI-VXI slot controller board and the preparation of the physical layer chip BCM54240 linux driver.The advantage of using uc-linux is its support for TCP / UDP and other basic network protocols.The LXI-VXI system controller designed in this paper has been manufactured with four sets of prototypes,passed the LXI-VXI system integration test,stability test,electromagnetic compatibility test and high and low temperature test.Its indicators basically meet the requirements.In the LXI-VXI integrated test system,multiple trough cascades work properly and implement IEEE1588V2 clock synchronization.