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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| N/A | Primitive | Primitive | Primitive | N/A | Primitive | Primitive | Primitive | Primitive |
PULLDOWN resistor elements are available in each XC4000, Spartan, or SpartanXL Input/Output Block (IOB). They are connected to input, output, or bidirectional pads to guarantee a logic Low level for nodes that might float.