Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–15
ALLOW_SYNCH_CTRL_USAGE
ALLOW_SYNCH_CTRL_USAGE
Type
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.
This option is useful for finding areas of the design that can be implemented more
efficiently with synchronous clear and/or synchronous load signals in normal mode
logic cells, and as a result, minimize the number of logic cells used in the design.
This option is turned on by default.
Boolean
Device Support
This setting can be used in projects targeting the following device families:
■ Arria GX
■ Arria II GX
■ Arria II GZ
■ Arria V
■ Cyclone
■ Cyclone II
■ Cyclone III
■ Cyclone III LS
■ Cyclone IV E
■ Cyclone IV GX
■ Cyclone V
■ HardCopy II
■ HardCopy III
■ HardCopy IV
■ MAX II
■ MAX V
■ Stratix
■ Stratix GX
■ Stratix II
■ Stratix II GX
■ Stratix III
■ Stratix IV
June 2012 Altera Corporation Quartus Settings File
Reference Manual