Altera Quartus II Settings File - Manual (Page 430)

ALM_REGISTER_PACKING_EFFORT
This guides how aggressively the Fitter will pack ALMs when trying to place registers into desired LAB
locations. Specifically, this option can be used to increase the usage of secondary register locations during
placement. Increasing ALM packing density may lower the number of ALMs needed to fit the design but
it may also reduce routing flexibility and timing performance. It should also be noted that this setting is
used as a hint for the Fitter only. Low - The Fitter will avoid ALM packing configurations that combine
LUTs and registers which have no direct connectivity. Avoiding these configurations may improve timing
performance but will increase the number of ALMs used to implement the design. Medium - The Fitter
allows some configurations that combine unconnected LUTs and registers to be implemented in ALM
locations. The Fitter will make more usage of secondary register locations within the ALM.> High - The
Fitter enables all legal and desired ALM packing configurations. In dense designs, the Fitter will
automatically increase the ALM register packing effort as required to enable the design to fit.
Type
Enumeration
Values
• High
• Low
• Medium
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
None
Syntax
set_global_assignment -name ALM_REGISTER_PACKING_EFFORT
Default Value
Medium
430 ALM_REGISTER_PACKING_EFFORT
MNL-Q21005
2015.05.04
Altera Corporation Quartus Settings File Reference Manual
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