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IOB
Spartan2
Virtex
Applicable Elements
Non-INFF/OUTFF flip-flop and latch primitives, registers
Description
IOB indicates which flip-flops and latches can be moved into the IOB. The mapper supports a command line option (-pr i | o | b) that allows flip-flop/latch primitives to be pushed into the input IOB (i), output IOB (o), or input/output IOB (b) on a global scale. The IOB constraint, when associated with a flip-flop or latch, tells the mapper to pack that instance into an IOB type component if possible. The IOB constraint has precedence over the mapper "-pr" command line option.
Syntax
IOB={TRUE | FALSE}
where TRUE allows the flip-flop/latch to be pulled into an IOB and FALSE indicates not to pull it into an IOB.
Example
Schematic
Attach to a flip-flop or latch instance or to a register.
UCF/NCF file
This statement prevents the mapper from placing the foo/bar instance into an IOB component.
INST foo/bar IOB=TRUEE;
Constraints Editor
N/A
Дабавь ключик соответственный , он туда и поместит.
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