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Altera_Forum's avatar
Altera_Forum
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10 years ago

Why do the number of VCCIO and GNDIO pairs more than number of banks in a device?

I assumed that there is a VCCIO for each bank. However, it seems that a single bank can have multiple VCCIO and GNDIO connections.

As far I understand a single bank shall have a single IO voltage which can be different from another bank but must be within the specified device limits.

Why does a singe bank need multiple VCCIO and GNDIO connections?

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    Each bank may, and usually does, have multiple VCCIO pins. This reduces the impedance onto the die. All VCCIO pins, for a particular bank, are clearly identified and must connect to the same power net.

    Cheers,

    Alex