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Gigabit Multimedia Serial Link (GMSL) Library
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Gigabit Multimedia Serial Link (GMSL) Library
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ChannelSpec

Channel Specification/ Signal Integrity

FAQs
  • FAQ

    How do I measure/decode the serial data (GMSL1)?

    GMSL1 has both forward and reverse data. A customer would need to use high impedance probes and use filtering to take out only the forward or reverse data. As GMSL is a proprietary link, there is not much…
  • FAQ

    How do I measure/decode the serial data (GMSL2)?

    GMSL2 has both forward and reverse data. Due to the proprietary nature of the GMSL link, a customer will not be able to see meaningful data. It is better to check for decode/PRBS/CRC errors.
  • FAQ

    How is Link Margin performed?

    Link margin testing is performed by reducing the peak-to-peak source voltage until an error has occurred.
  • FAQ

    How much insertion loss can a GMSL2 system tolerate?

    The allowable insertion loss depends on the selected bit rate and. It is given in the GMSL Channel Specification.
  • FAQ

    I am not building all sections of a GMSL channel. How do I determine I have a compliant channel?

    The Channel specs include specifications for 2 types of individual modules: The PCB channel and the cable channel.
  • FAQ

    I am passing the Link Margin test, but my system is failing the GMSL channel specification. Is my system compliant and expected to work?

    The expectation is that the cable and system never fail the GMSL channel specification limits. The cable or system, under all expected conditions, must still pass the channel specification. Link margin…
  • FAQ

    I am using a GMSL2 part in GMSL1 mode. which channel spec should I use?

    Customers should follow the GMSL specification according to whichever mode is being used. thus a part working in GMSL1 mode should follow the GMSL1 specs. However, to reduce the amount of redesign, it…
  • FAQ

    What are the Nyquist rates of GMSL2 Links?

    The Nyquist rate is half the baud rate of a given signal. The baud rate is different from bit rate that it is the "number of changes in a signal per second" while bit rate is "number of bits per second…
  • FAQ

    What are the sources of insertion loss on the GMSL channel?

    ohmic losses along the PCB traces and cable conductors; dissipated power through the PCB and cable dielectric; and the resistance of the metal-to-metal interfaces of the connectors, In addition, impedance…
  • FAQ

    What are three ways to mitigate crosstalk interference in the PCB channel?

    Increase the distance between traces Add shielding Reduce the power of the crosstalk noise source
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