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DS91M040: DS91M040 multipoint networks

Ian Costabile
Prodigy 40 points
Part Number: DS91M040

Tool/software:

Hello,

The DS91M040 datasheet specifies it is "designed for driving / receiving clock or data signals to / from up to four multipoint networks."

It isn't clear to me what you mean by "multipoint networks" as the MLVDS standard should support 32 nodes.

Does that mean it can supports 32*4 nodes by connecting 4 buses together?

Can you please confirm that it supports 32 nodes on a single bus?

Thank you, Ben

  • 0
    TI__Genius 15301 points

    Hi Ben,

    This is a good question. I can see where the datasheet wording may be a bit confusing. Hopefully this helps clear things up:

    M-LVDS stands for "multipoint" LVDS. The reference to "four" multipoint networks comes from the design of the device, which has four channels (for reference, see the logic diagram on page 2). These four channels can be placed along four separate backplane buses. Per the MLVDS standard (the TIA/EIA-899), each MLVDS bus can support up to 32 nodes, and per the datasheet, this device "Conforms to TIA/EIA-899 M-LVDS Standard". The 4 buses cannot be connected together. 

    You may find this application to be of interest as well: An Introduction to M-LVDS and Clock and Data Distribution Applications (Rev. C)

    Sincerely, Amy