IOB Flip-Flops and Latches

• IOB Flip-Flop/Latch features

  • Programmable clock polarity
  • Clock enable
  • Global Set or Reset
  • No Asynchronous Local Set/Reset

• Flip-Flops and Latches can be used in unbonded IOBs

• Use IOB Flip-Flops:

  • When all CLB Flip-Flops are used
  • To minimize the Flip-Flop-to-PAD delay
  • Minimize skew between outputs

• IO Blocks contain minimal combinatorial logic

  • IOB Flip-Flops can be used as part of an internal shift register
  • Do not use IOB Flip-Flops as part of a pipeline

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