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