Local area network (LAN) extension for instrumentation (LXI) interface circuit based on hardware extraction of 1588 time stamp

Abstract

The invention relates to a local area network (LAN) extension for instrumentation (LXI) interface circuit based on hardware extraction of a 1588 time stamp. The LXI interface circuit comprises an embedded processor circuit, an institute of electrical and electronic engineers (IEEE) 1588 trigger management circuit, a Flash storage module, a double data rate (DDR) dynamic storage circuit and an LAN interface communication circuit, wherein the embedded processor circuit is used for providing a network interface in communication with a control computer and realizing program storage and processing of relevant LXI bus protocols; the IEEE 1588 trigger management circuit is used for processing a 1588 protocol and managing 1588 relevant triggering and extraction of a time stamp; the Flash storage module is used for storing system data and an application program; the DDR dynamic storage circuit is used for dynamically storing process data and buffering reading and execution of the application program; and the LAN interface communication circuit is used for providing a hardware channel in communication with the control computer. The LXI interface circuit based on the hardware extraction of the 1588 time stamp is based on an LXI bus standard. LXI protocol processing in a high-performance multimedia personal computer (MPC) processor is realized, and management of interface circuits such as an upper computer and a function circuit is established.

Description

technical field [0001] The invention relates to an LXI interface circuit for extracting 1588 time stamps based on hardware. Background technique [0002] In 2004, Agilent and VXI Technology proposed a new instrument bus—LXI (LAN eXtensions for Instrumentation). LXI instruments do not need a special backplane bus chassis and zero-slot controller, and directly use the standard LAN interface of a general-purpose PC, which greatly reduces development and application costs. And LAN is the industry's most stable and open industry standard with the longest life cycle and is still developing. It is easy for manufacturers to transplant existing instrument products to the LAN platform. The measurement and control system provides convenience. At the same time, the LXI bus standard defines the precise time synchronization function based on IEEE1588, and introduces the concept of time-based triggering for the first time in the field of test and measurement, making it easy to build a re...

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Problems solved by technology

[0003] With the development of ATS (Automatic Test System) technology, in the distributed measurement and control system, the test instrument is required to have remote program control function. The existing buses such as GPIB, PCI / PXI, etc. cannot meet the requirements very well. IEEE1588 precision time The synchronization protocol can realize the remote trigger synchronization function of test and measurement instruments or systems. The time synchronization trigger accuracy of instruments with IEEE1588 functions is a key technology of Class B LXI instruments, which directly determines the performance of an ATS system. The method of software extracting IEEE1588 time stamp is realized, and the accuracy is at the millisecond level, which is difficult to meet the development trend of ATS technology; in addition, since the LXI v1.2 standard adopts the new IEEE1588-2008 protocol, it is different from the IEEE1588-2002 adopted by the previous LXI instrument. Cannot be used compatible, which brings great restrictions to building a test system

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