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Autodesk EAGLE
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Autodesk EAGLE
Forum So, here I want to know "how to route or fanout the ball grid array of spartan 7 fpga (XC7S100FGGA676) which has 676 pins?". Can anyone help me out?
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So, here I want to know "how to route or fanout the ball grid array of spartan 7 fpga (XC7S100FGGA676) which has 676 pins?". Can anyone help me out?

krishna_teja
krishna_teja over 4 years ago

So, here I want to know "how to route or fanout the ball grid array of spartan 7 FPGA (XC7S100FGGA676 ) which has 676 pins?". Can anyone help me out?
Actually, I am using Autodesk Eagle version 9.1.0.

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  • rachaelp
    rachaelp over 4 years ago +5 suggested
    How many layers is your board? How much of the IO is used vs unused? What are any signal integrity requirements which will drive numbers of GND layers? First things first... Do NOT under any circumstances…
  • jc2048
    jc2048 over 4 years ago +3 suggested
    This might help you get started, if you haven't read it already https://www.xilinx.com/support/documentation/user_guides/ug1099-bga-device-design-rules.pdf
  • wolfgangfriedrich
    wolfgangfriedrich over 4 years ago +3 suggested
    Here is another good document to read: https://www.latticesemi.com/view_document?document_id=671 It is a 1mm ball pitch and not all signals are used (although 2 sides look pretty busy), so you might get…
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  • wolfgangfriedrich
    0 wolfgangfriedrich over 4 years ago

    Here is another good document to read:

    https://www.latticesemi.com/view_document?document_id=671

     

    It is a 1mm ball pitch and not all signals are used (although 2 sides look pretty busy), so you might get away with 8 to 10 layers either with blind and burried vias or very fine pitch trace and clearance (3mil/3mil or maybe 4/4). If you have a lot of special signals (DDR memory bus, differential pairs) the layer count can go up quickly as you might need more GND planes.

     

    Good luck.

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  • wolfgangfriedrich
    0 wolfgangfriedrich over 4 years ago

    Here is another good document to read:

    https://www.latticesemi.com/view_document?document_id=671

     

    It is a 1mm ball pitch and not all signals are used (although 2 sides look pretty busy), so you might get away with 8 to 10 layers either with blind and burried vias or very fine pitch trace and clearance (3mil/3mil or maybe 4/4). If you have a lot of special signals (DDR memory bus, differential pairs) the layer count can go up quickly as you might need more GND planes.

     

    Good luck.

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