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Quartus II Settings File Reference Manual - Altera

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6–36 Chapter 6: Fitter Assignments<br />

CLAMPING_DIODE<br />

CLAMPING_DIODE<br />

Type<br />

Turns on the clamping diode of a pin. The clamping diode can be turned on to limit<br />

overshoot voltage for a pin in input operation. The clamping diode is turned on by<br />

default for 3.0-V PCI/PCI-X I/O standards. The clamping diode is turned off by<br />

default for 3.3-V LVTTL/LVCMOS I/O standards. This option is ignored if it is<br />

applied to anything other than a pin or a top-level design entity.<br />

Boolean<br />

Device Support<br />

This setting can be used in projects targeting the following device families:<br />

■ Arria <strong>II</strong> GX<br />

■ Arria <strong>II</strong> GZ<br />

■ Arria V<br />

■ Cyclone V<br />

■ HardCopy <strong>II</strong>I<br />

■ HardCopy IV<br />

■ Stratix <strong>II</strong>I<br />

■ Stratix IV<br />

Notes<br />

This assignment supports wildcards.<br />

This assignment is included in the Fitter report.<br />

Syntax<br />

set_global_assignment -name CLAMPING_DIODE -entity <br />

set_instance_assignment -name CLAMPING_DIODE -to -entity <br />

set_global_assignment -name CLAMPING_DIODE <br />

Example<br />

set_instance_assignment -name CLAMPING_DIODE ON -to pin<br />

Default Value<br />

Off<br />

<strong>Quartus</strong> <strong>Settings</strong> <strong>File</strong> June 2012 <strong>Altera</strong> Corporation<br />

<strong>Reference</strong> <strong>Manual</strong>

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