Altera Quartus II Settings File - Manual (Page 459)

CLAMPING_DIODE
Turns on the Clamping Diode of a pin. The clamping diode can be turned on to limit overshoot voltage
for a pin in input operation. The clamping diode is turned on by default for 3.0-V PCI/PCI-X I/O
standards. The clamping diode is turned off by default for 3.3-V LVTTL/LVCMOS I/O standards. This
option is ignored if it is applied to anything other than a pin or a top-level design entity.
Type
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment supports Fitter wildcards.
This assignment is included in the Fitter report.
Syntax
set_global_assignment -name CLAMPING_DIODE -entity <entity name> <value>
set_instance_assignment -name CLAMPING_DIODE -to <to> -entity <entity name>
<value>
set_global_assignment -name CLAMPING_DIODE <value>
Default Value
Off
Example
set_instance_assignment -name CLAMPING_DIODE ON -to pin
MNL-Q21005
2015.05.04
CLAMPING_DIODE 459
Quartus Settings File Reference Manual Altera Corporation
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