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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive |
The VCC signal tag or parameter forces a net or input function to a logic High level. A net tied to VCC cannot have any other source.
When the placement and routing software encounters a net or input function tied to VCC, it removes any logic that is disabled by the VCC signal. The VCC signal is only implemented when the disabled logic cannot be removed.