Altera Quartus II Settings File - Manual (Page 37)

ALLOW_SYNCH_CTRL_USAGE
Allows the Compiler to utilize synchronous clear and/or synchronous load signals in normal mode logic
cells. Turning on this option helps to reduce the total number of logic cells used in the design, but might
negatively impact the fitting since synchronous control signals are shared by all the logic cells in a LAB.
Type
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment is included in the Analysis & Synthesis report.
This assignment supports synthesis wildcards.
Syntax
set_global_assignment -name ALLOW_SYNCH_CTRL_USAGE <value>
set_global_assignment -name ALLOW_SYNCH_CTRL_USAGE -entity <entity name>
<value>
set_instance_assignment -name ALLOW_SYNCH_CTRL_USAGE -to <to> -entity
<entity name> <value>
Default Value
On
Example
set_global_assignment -name allow_synch_ctrl_usage off
set_instance_assignment -name allow_synch_ctrl_usage off -to foo
See Also
Force Use of Synchronous Clear Signals
MNL-Q21005
2015.05.04
ALLOW_SYNCH_CTRL_USAGE 37
Quartus Settings File Reference Manual Altera Corporation
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