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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| N/A | N/A | N/A | N/A | N/A | N/A | N/A | Primitive | Primitive |
KEEPER is a weak keeper element used to retain the value of the net connected to its bidirectional O pin. For example, if a logic 1 is being driven onto the net, KEEPER drives a weak/resistive 1 onto the net. If the net driver is then tri-stated, KEEPER continues to drive a weak/resistive 1 onto the net.
For additional information on using a KEEPER element with SelectI/O components, refer to the “SelectI/O Usage Rules” in the "IBUF_selectIO" section.