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PicoZed Hardware Design PicoZed 7030 Net Lengths
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PicoZed 7030 Net Lengths

Former Member
Former Member over 9 years ago

Hi,

We are designing carrier board for PicoZed 7030. We will use high speed differential signals(500MHz). Thus; knowing the signal lengths is essential for our design.

Does the given "Routed Net Lengths Table" consist FPGA internal net lengths and via lengths?

Thanks,
Muhammet

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  • Former Member
    0 Former Member over 9 years ago

    Hello Muhammet,

     

    Here is the guidance from our engineering team:

     

    The 7030 Net Length report that is posted are the physical net lengths on the board.

    The end customer should take the PZ7030 net length report + the 7030 package delay file + the expected delay in their carrier into account when doing their analysis if they want to achieve a high performance interface.

    Then they should use common guidelines for matching to achieve 500Mb/s. The Vita57 FMC spec says < 200ps of skew to achieve this. If you use 167ps/in (2ns/ft) average prop delay in FR4, total skew can be an inch and you can achieve 500Mb/s.

    So, net length + package delay + carrier delay < 167ps or 1 inch should cover them.
     

     

    -Gary

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  • Former Member
    0 Former Member over 9 years ago in reply to Former Member

    Hello Gary,

    Thank you for your answer. I think, the number of via on the signals are also important. Does all differential signals have same number of via?

    Muhammet

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  • Former Member
    0 Former Member over 9 years ago

    Hi Muhammet,

     

    There is the response:

     

    That is important. The bulk of the signals will have two. A BGA breakout to an internal layer and a breakout from the internal layer to the to the surface right at the connector.
     

     

    -Gary

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