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Altera_Forum's avatar
Altera_Forum
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15 years ago

Error: Too many output and bidirectional pins in I/O bank 2

Hi, everybody. I am designing a new product on EP2C5Q208C8. In the design ,I use DDR sdram controller. so ,there are many sstl2 standard pins. But, I encounter the following error. how to ru...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The error means what it says. You are only allowed so many output pins near a VREF pin because of the potential noise effects on the VREF for the corresponding input pins. You need to either move one of the output pins to a different VREF group, or remove the input pin(s) from the group.

Jake