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WKUAN's avatar
WKUAN
Icon for New Contributor rankNew Contributor
5 years ago

Arria10 : Total current per LVDS I/O bank must not exceed 100 mA.

Hi friends,

I am designing one board with ARRIA10, I want to use 44 pairs LVDS in 2 banks, such as 3A and 3B, when i check the datasheet <Intel® Arria® 10 Device Datasheet>, i found a note 3 on page 5, which is "Total current per LVDS I/O bank must not exceed 100 mA." as the current of LVDS is almost 4mA, it will be 22*2*4=176mA per bank, which is almost 2 times of the rated current.

Can I use 100% LVDS pairs of one bank?

Thanks and best regards,

4 Replies

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi Wu Kuang,

    May i know how do you determine the current of a pair LVDS? Also, bank 3A and 3B are considered as 2 bank.

    Thank You.

    • WKUAN's avatar
      WKUAN
      Icon for New Contributor rankNew Contributor
      5 years ago

      Hi Sooy，

      Thank you for your reply.

      I want to use a 22 pair of LVDS in 3a bank for input, a 22 pair of LVDS in 3b bank for another set of input, a 15 pair of LVDS in 3c bank for output, and a 15 pair of LVDS in 3d bank for another set of output, will this setup work？The chip chosen is 10ax115nf45.

      I see that the LVDS specification says the current is 3.5mA. I wonder how this current is calculated. Is it a current limitation of one pair of LVDS or a wire?​

      Thanks and best regards,

      KUANG Wu

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hu Kuang,

    There is no limitation on the mA on a LVDS Bank. The 100mA is only applicable during configuration time. When it is in user mode, no restriction for that.

    Thank You.