A logic option that causes registers that do not have a Power-Up High logic option setting to power up with a don't care logic level (X).

If this option is turned on, the register powers up with the logic level most appropriate for the design, as shown in the following illustration:

powers up as

If this option is turned off, the register powers up low, as shown in the following illustration:

This option is useful for allowing the Compiler to change the power-up level of a register to minimize the area of the design.

This is a project-wide option. This option is available for all Altera^® devices supported by the Quartus^® II software.

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