[SOLVED] j-tag limit on number of devices?

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  • [SOLVED] j-tag limit on number of devices?

    I've read in some Segger documentation the limit on the number of jtag devices is 8. Is this still the case today (Sept 2020) ?

    I recently found out the STM32 MCU's I am using have two jtag devices each (ex the STM32G431 and STM32F302). Does this mean if I chain 4 MCU the jtag will see 8 devices? So my limit on chained MCU's is 4?

    Thanks,
    Brian
  • Hi Brian,
    Thank you for your inquiry.

    Could you tell us where exactly you found this information?
    I am asking because we would like to correct the related section.
    Our limits as of now are:
    Max number of devices in chain: 32
    Total IR length: 255
    Max DR length: 64 (Max. DRLen of the device we talk to in bits)


    Best regards,
    Fabian
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/

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  • Hi,

    That‘s indeed outdated.
    We will correct this.
    Thanks for letting us know.


    BR
    Alex
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/

    Or you can contact us via e-mail.
  • Hi,
    We updated the specifications in the documentation:

    wiki.segger.com/UM08001_J-Link…User_Guide#Specifications

    We will close this thread now.

    Best regards,
    Fabian
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/

    Or you can contact us via e-mail.