Altera Quartus II Settings File - Manual (Page 953)

FAST_INPUT_REGISTER
Implements an input register in a cell that has a fast, direct connection from an I/O pin. If such a fast,
direct connection from the I/O pin is not available on the I/O cell hardware, this option instructs the
Fitter to lock the input register in the LAB adjacent to the I/O cell feeding it. Turning on the Fast Input
Register option can help maximize I/O timing performance, for example, by permitting fast setup times.
Turning this option off for a particular signal prevents the Fitter from implementing the signal
automatically in an I/O cell or locking down the input register in the LAB adjacent to the I/O cell. This
option is ignored if it is applied to anything other than a register or an input or bidirectional pin that feeds
a register.
Type
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment supports Fitter wildcards.
Syntax
set_instance_assignment -name FAST_INPUT_REGISTER -to <to> -entity <entity
name> <value>
MNL-Q21005
2015.05.04
FAST_INPUT_REGISTER 953
Quartus Settings File Reference Manual Altera Corporation
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