Easter egg at the end of the event: Tektronix answers 9 questions from netizens in the USB theme event[Copy link]
Not long ago, Tektronix held a USB theme event in the community (Click here to view event details), sharing Tektronix's USB test and measurement solutions, and collecting questions from netizens. After the event, Tektronix selected 9 netizens to answer questions. First of all, on behalf of the netizens who participated in the event, I would like to thank Tektronix for answering the netizens' questions. The following is the details of the question and answer. （Note: This part is a new attempt of the community. Netizens are welcome to post comments. We will pay attention to it and use it as a reference for future optimization activities.） 【Tektronix answers netizens' questions】@rinfen Netizen asked: Our USB3.1 is used for board-levelSoCcommunication. How should the test fixture be connected at this time? Tektronix's answer: The test fixture is mainly used to test the standard USB interface, which is also the consistency test we often talk about. If it is the communication between board-level SOCs, you can use a probe to introduce the signal into the oscilloscope, so as to analyze the quality of the signal in the oscilloscope and perform the test. @xiaoweiqq User asked: I want to know about the eye diagram jitter of the send and receive signals of Type C Tektronix's answer: Tektronix's consistency test software can automatically measure the eye diagram and jitter of the Type C transmitter signal, and give the pass or fail results according to the specifications of the USB Association. @xiaozhuang asked: When debugging USB3.0 signals at high frequencies, there is packet loss. Communication error. Unable to download the program. Tektronix answered: In this case, it is recommended to first measure the signal integrity of the USB3.0 signal to see if there is any problem with the signal quality. If there is no problem with the physical layer transmitter and receiver, please contact the chip manufacturer to do protocol analysis together. @fzyiye Question: How to evaluate the robustness of USB communication signals? Tektronix Answer: To measure signals, the most important thing is to use an oscilloscope. The oscilloscope contains software for USB signal measurement, which can comprehensively evaluate USB communication signals. @carcar008 Question: The data transmission rate of USB3.1 is far from the theoretical value, and the cause of the problem cannot be found. Tektronix Answer: It is recommended to test the physical layer of the transmitter and receiver first. There are many possible reasons for the low transmission rate. It may be too much packet loss, or the USB3.0 mode is abnormal and auto-negotiated to 2.0 mode. If the packet loss or abnormal USB3.0 mode is caused by electrical characteristics problems, it can be detected by physical layer tests on the transmitter and receiver. @zhyouer Question: USB3.1What are the main differences between USB Type-C and USB Type-C? Tektronix's answer: USB3.1 is mainly divided into USB3.1 Gen1 first generation and USB3.1 Gen2The second generation, the speeds of the two are different, Gen1 is5Gbps, Gen2 is10Gbps. The most common interfaces are Type A standard port and Type C interface. Type A interface is commonly found in PC, Server, etc. The most common Type C interface is on laptops, mobile phones, etc. Compared with Type A, the main advantages of Type C are that it can be plugged in both directions, high-power charging, and support applications such as Display port. @zx1988ZX Q: What are the new features of USB3.1? Compared with USB3.0, what are the new breakthroughs? Tektronix's answer: The most important thing is that USB3.1 Gen2can achieve a data rate that is 2times that of USB3.0. Gen2 is 10Gbps, USB 3.0 is 5Gbps. @bjs1688 Question: How to send the required code typeTektronix Answer: When doing tests, the test patterns we usually use are called consistency test patterns. For measuring USB3.0 and USB3.For 1signals, the specification requires that when the test fixture is plugged in, that is, when the DUT detects that there is a termination, the CP0 test pattern will be sent. If the DUT does not send it, the USBAssociation also provides corresponding free tools to allow the tester to enter the consistency test mode and send the test pattern. For USB2.0, there are also corresponding free tools. @24不可说 Question: Compatibility of USB3.0 interface and USB2.0Tektronix's answer: USB3.0 is backward compatible withUSB2.0. When two products, one USB3.0 and the other USB2.0, are connected, they will work in USB2.0 mode.
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