【Live FAQ】The necessity and solution of Microchip time synchronization

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【Live FAQ】The necessity and solution of Microchip time synchronization [Copy link]

Live Topic: The Necessity of Time Synchronization and Its Solutions

Brief introduction: In communication systems, we often hear about time synchronization technology. Why is time synchronization needed? What synchronization devices make up a synchronization network? What are the time synchronization technologies? In this online seminar, we will introduce the concept of time synchronization and the source of demand, the composition of the synchronization network, Microchip's time synchronization solution, and the key points in synchronization design.

Live lecturer:

Yan Bo, Senior Application Engineer, Microchip Technology Inc.

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Bobby Yan is currently a senior application engineer at Microchip Technology Inc. Wuhan office. He joined Microchip in 2021 and has 17 years of experience in the communications industry. Prior to this, he worked as a hardware/clock algorithm system engineer at Huawei and Zhejiang Saisi.
Bob Yan has extensive R&D and application experience in clock synchronization/1588 design. He is currently responsible for technical support of clock products at Microchip.
Bob Yan graduated from Wuhan University of Technology in 2004 with a bachelor's degree in communications engineering. He also received a bachelor's degree in psychology from Central China Normal University.

FAQ Details

1. Is clock synchronization still necessary in low-speed circuits?

A: Basically, only E1 services require clock synchronization. The synchronization requirement of SDH is not high and should be within ±20ns.

2. Is clock synchronization still necessary in low-speed circuits?

A: ±20ppm

3. Is clock synchronization still necessary in low-speed circuits?

A: Ethernet is ±100ppm, so there is no need for synchronization at the business level. Our transmission equipment implements clock synchronization mainly to transmit it to the final node. In the field of communications, it is mainly used for wireless base stations.

4. What applications are suitable for Microchip's time synchronization?

A: Wireless, electricity, finance, autonomous driving and other fields will be involved, and this will also be introduced in the film.

5. Does Microchip's time synchronization have any impact on parallel port connections to the same chip?

A: What does parallel port connection with chip mean?

6. What are the main application areas of Microchip's time synchronization solutions?

A: This film will introduce

7. What specific problems does Microchip's time synchronization solution solve?

A: 1588 can solve time synchronization problems in many fields, especially those applications that require high-precision time synchronization. For example, the following fields:

8. What specific areas of problems does Microchip's time synchronization solution solve?

A: Communication network: In mobile communication networks, ensuring the clock synchronization of each base station is key to prevent data loss and communication interruption.

9. What specific problems does Microchip's time synchronization solution solve?

A: Industrial Automation: 1588 can ensure the clock synchronization of sensors, actuators, and controllers in industrial networks, thereby improving the reliability and accuracy of the system.

10. What specific areas of problems does Microchip's time synchronization solution solve?

A: Financial transactions: 1588 can ensure the clock synchronization of each node in the transaction system. Data center and cloud computing: Each server and network device in the environment needs to be highly synchronized to support tasks such as virtualization, load balancing and data backup.

11. What are the advantages of Microchip's time synchronization solution compared to other solutions?

A: I will introduce this in the voice Q&A session, so stay tuned :)

12. What are the advantages of Microchip's time synchronization solution compared to other solutions?

A: Microchip's 1588 solution can provide an end-to-end solution, a one-stop solution from software to hardware, and can also achieve high-precision synchronization performance, such as Class

13. What are the advantages of Microchip's time synchronization solution compared to other solutions?

A: For example, class D 5ns.

14. Why is device time synchronization (clock synchronization) necessary?

A: Because in many applications and fields, time accuracy and synchronization are critical to normal operation and data integrity. For example, in communication networks, clock synchronization is required to prevent data loss and communication interruption.

15. How to obtain product information?

A: You can email us at charles.yang@microchip.com bobby.yan@microchip.com

16. Do embedded billing devices like ours still need 1588 for clock synchronization? For example, applications like charging piles.

A: We have not seen similar applications yet. If you have related needs in the future, please contact us.

17. Will you talk about IEE1588 today?

A: Today’s topic is mainly about this part.

18. Does the Microchip solution use TSN?

A: We have a TSN solution.

19. In addition to Beidou and GPS, what other methods are there for time synchronization?

A:PTP/1588

20. Can you share TSN?

A: There is no TSN section in this seminar.

21. Can time synchronization be used in CAN communication?

A: The 1588 physical interface is based on the Ethernet interface.

22. What is the difference between 1588 and AS?

A: Are you referring to 802.AS TSN? What is the difference between 1588 and TSN?

23. What is the difference between 1588 and AS?

A: IEEE 1588: focuses on time synchronization, and its main goal is to ensure that the clocks of network devices are synchronized to support time-sensitive applications.

24. What is the difference between 1588 and AS?

A: TSN: TSN not only includes time synchronization, but also covers other time-sensitive functions such as flow control, bandwidth management and queuing mechanisms to support a wide range of real-time communication needs.

25. What is the difference between 1588 and AS?

A: The prerequisite for implementing TSN is to support 1588

26. Do I need an external crystal oscillator?

A: Yes, an external crystal oscillator is required. For clock card applications, an external TCXO or OCXO is required. For line card applications, an external XO is required.

27. Is the time synchronization solution expensive? Should it be implemented in hardware or software?

A: NTP can be implemented by pure software, while PTP requires the cooperation of hardware and software. However, NTP can only achieve millisecond-level synchronization, while PTP can achieve nanosecond-level synchronization.

28. Does 1588 require underlying chip hardware support?

A: Yes, it requires hardware support, such as hardware support for timestamp TSU

29. What are the applications in automotive circuits?

A: In advanced autonomous driving, there are 1588 requirements, such as the Ethernet switch in the car needs TSN

30. For clock synchronization of network communication, is the clock reference through an external crystal oscillator?

A: You can understand it this way. Different devices have different internal reference sources (crystal oscillators). For example, a first-level clock device needs to use an atomic clock as a reference source.

31. What are the requirements for local hardware for time synchronization? The hardware must support PTP function, and the MAC or PHY must support

A: Hardware support is required. For example, the MAC and PHY you mentioned need to support the timestamp TSU function.

32. What is the most eye-catching feature of Microchip's time synchronization solution? Thank you

A: One-stop solution, hardware + software, high-precision synchronization performance such as 5ns

33. What are the advantages and disadvantages of phase synchronization and frequency synchronization?

A: Frequency synchronization generally refers to SYNCE, which is a pure physical layer synchronization. Phase synchronization can be understood as 1588, which can achieve frequency and phase synchronization. Synchronization is achieved through software algorithms.

34. Will there be sharing after the PPT meeting?

A: You can contact us at charles.yang@microchip.com bobby.yan@microchip.com

35. Can the clocks of two Gigabit Ethernet chips be completely synchronized?

A: Yes, through PTP/1588

36. Is the accuracy of PTP the same as that of GPS now?

A: Microchip's 1588 solution can achieve 5ns

37. Is the accuracy of PTP the same as that of GPS now?

A: 5ns

38. Is the accuracy of PTP the same as that of GPS now?

A: The synchronization accuracy is 5ns, but 1588 does not have some problems with GPS, such as installation problems, signal blocking and interference.

39. ADAS is definitely needed.

A: Yes. Currently, similar customers have adopted our solution.

40. Will Microchip open its driver program?

A: Linux PTP will be open

41. Will Microchip open its driver program?

A: Based on the Liunx PTP algorithm, the API will be open

42. What is zarlink’s solution?

A: Yes, Microsemi acquired Zarlink, and Microchip acquired Microsemi.

43. Is there anyone who can return the car?

A: We have a relevant roadmap

44. What are the main tasks in implementing the plan? How much is the workload?

A: It is mainly at the 1588 algorithm level, and the software workload is relatively large.

45. Ethernet phy rgmii, the hardware crystal oscillator uses 25MHz, what is the synchronization performance? Thank you

A: This cannot be estimated. There are many factors that affect synchronization performance, including software and hardware, including link delay.

46. Ethernet phy rgmii, the hardware crystal oscillator uses 25MHz, what is the synchronization performance? Thank you

A: From the PHY level, we need to look at the PHY poking accuracy.

47. What is the ns level of the best Ethernet time synchronization currently achieved?

A: The highest requirement currently is G.8273.2 class D single hop 5ns

48. Does it support 4G module?

A: 1588 synchronization includes electrical mode and packet mode. The electrical mode here refers to GPS synchronization, and the packet mode is PTP based on Ethernet. 4G modules are not supported.

49. Will frequency and phase synchronization be affected by operating temperature?

A: Yes, so the 1588 is used to restore the accurate frequency and phase. It needs to be connected to a TCXO or OCXO.

50. Can 1588 achieve software compensation for the temperature drift error of the first-stage crystal oscillator?

A: In the future, our 1588 algorithm will integrate the temperature drift and aging compensation of the crystal oscillator.

51. Does Microchip have a 1588 measurement solution?

A: No.

52. Does Microchip’s solution have encryption?

A: Our PHY can support MACsec function

53. What is the time synchronization solution in autonomous driving?

A: Generally speaking, it is divided into three parts. The first part is GPS to 1588. For example, in TBOX, GPS is converted to PTP/1588. The second part is TSN switch, which distributes PTP/1588. The third part is LiDAR or camera.

54. What is the time synchronization solution in autonomous driving?

A: Through these three parts, GPS time can be sent to radar or camera to achieve synchronous data collection and processing.

55. In video signal transmission, is it necessary to use 1588 for time synchronization?

A: Yes. There are relevant standards for video, SMPTE ST2059-1

56. What is the difference between Linux PTP and Linux RT?

A: Linux PTP is used to achieve clock synchronization, and RT is used to schedule and execute real-time tasks.

57. What version is 1588 at now?

A: The latest IEEE1588 standard is IEEE1588-2019

58. What are the synchronization modes?

A: GPS and 1588

59. What are the characteristics of microchip time synchronization?

A: One-stop solution, high-precision synchronization performance

60. Is there any relationship between the accuracy of time synchronization and the frequency of the clock chip?

A: No, the hardware is related to the poking accuracy and PCB routing.

61. What is the high-precision synchronization performance that Microchip’s time synchronization solution can achieve?

A: class D ±5ns

62. Are there any requirements for the wiring length?

A: For 5ns

63. Are there any requirements for the wiring length?

A: There are routing requirements for high-precision synchronization, such as 5ns, because PCB routing will cause time delay, but our phase-locked loop supports phase compensation function, which can compensate for PCB delay.

64. What is the accuracy of the clock? How to compensate?

A: Do you mean synchronous Ethernet? Synchronous Ethernet can meet the requirements of G.8262.1. If it is clock compensation, it can only be compensated by entering the hold mode. Under normal circumstances, it is tracking the source. There are many methods for phase compensation, which can be input and output for compensation.

65. What is the source of clock accuracy for 1588?

A: Through the internal reference source, crystal oscillator. Use different crystals for different applications or levels. For example, atomic clocks, OCXO, TCXO, XO

66. I missed it. Is there a replay?

A: This should be available. If you need it, please contact me at bobby.yan@microchip.com

67. 1588 also needs an external crystal oscillator, right?

A: Yes

68. Is there any application in TBOX?

A: Yes. Locking GPS provides a hold function.

69. Are time synchronization chips expensive?

A: It is more expensive than the general JA.

70. Is time synchronization useful?

A: Of course it is useful :)

71. What are the applications in the automotive field?

A: Advanced autonomous driving.

72. What are the applications in the automotive field?

A: It is required for advanced autonomous driving.

73. Does OTN time synchronization also use 1588?

A: Yes

74. Is time synchronization a necessary function on the base station?

A: 5G is a must. 4G depends on the standard. Telecom does not need it.

75. What hardware is needed for synchronization at the microsecond level?

A: Hardware stamping capability is necessary. It does not necessarily require a synchronization chip, but it does require a relatively accurate source, such as a TCXO.

76. Can the current 1588 solution be used in the power system?

A: Yes

77. What are the benefits of time synchronization in the automotive field?

A: Advanced autonomous driving and V2X require support for clock synchronization

78. Where can I find the information?

A: You can contact us by email at charles.yang@microchip.com bobby.yan@microchip.com

79. Is it possible to just divide the sending time and receiving time by two to get the time spent on the road, and then compensate for it?

A: No, 1588 assumes that the two-way transmission is symmetrical, so the offset calculation formula is (T4-3)-(T2-T1)/2, and then compensation is performed.

80. What are the 1588 physical interfaces?

A: Currently, the mainstream ones are Ethernet and OTN. SDH/E1/GPON can also be implemented, but they are not widely used and there seems to be no unified standard.

81. In Xi’an area, who should I contact offline?

A: You can contact us by email first: charles.yang@microchip.com bobby.yan@microchip.com and then we will transfer it to our colleagues in Xi'an

82. What series of phy does Microchip have now?

A: For VSC series and LAN series, please contact our local sales team for details.

83. Where to download relevant materials and view relevant information

A: You can send us an email: charles.yang@microchip.com bobby.yan@microchip.com

84. Where to download relevant materials and view relevant information

A: You can contact us by email at charles.yang@microchip.com bobby.yan@microchip.com

85. What is the general period of time synchronization used in smart meters?

A: I don't know much about this. It depends on the synchronization accuracy requirements. The higher the requirements, the shorter the cycle.

86. Which solution provides the best reliability for time synchronization?

A: Of course it is Microchip’s solution :)

87. Is the algorithm of 1588 open? Can it be seen? Or is it packaged?

A: Linux PTP can be downloaded from the Internet

88. How accurate is the software compensation?

A: The accuracy of compensation still depends on the hardware. The software only implements the compensation action.

89. How to contact offline?

A: You can contact us by email first: charles.yang@microchip.com bobby.yan@microchip.com

90. The timing center has deployed several cesium clocks and hydrogen clocks from Microchip.

A: Yes :)

91. Can the phase offset of the clock be corrected through 1588 compensation?

A: Yes

92. What packages are available for 1588?

A: Do you mean the second or third layer packaging?

93. In which product areas is 1588 currently mainly used?

A: 1588 can solve time synchronization problems in multiple fields, including communication networks, industrial automation, financial transactions, data centers and cloud computing.

94. Is +-1ns achieved by phase?

A: In fact, it is mainly achieved through high-precision measurement.

95. After a quick glance, what is the name of ISO1588, open source LInux?

A: It is IEEE1588, we can support Linux

96. After a quick glance, what is the name of ISO1588, open source LInux?

A: It can support Linux PTP

97. Will the time synchronization software perform automatic calibration?

A: Yes.

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