Altera Quartus II Settings File - Manual (Page 134)

MUX_RESTRUCTURE
Allows the Compiler to reduce the number of logic elements required to implement multiplexers in a
design. This option is useful if your design contains buses of fragmented multiplexers. This option repacks
multiplexers more efficiently for area, allowing the design to implement multiplexers with a reduced
number of logic elements. You can select the 'On' setting to minimize your design area; it will decrease
logic element usage but may negatively affect design clock speed (fMAX). You can select the 'Off' to
disable multiplexer restructuring; it does not decrease logic element usage and does not affect design clock
speed (fMAX). You may select 'Auto' setting to allow the Quartus II software to determine whether
multiplexer restructuring should be enabled. The Quartus II software uses other synthesis settings, for
example, the Optimization Technique option, to determine if multiplexer restructuring should be applied
to the design; the 'Auto' setting will decrease logic element usage but may negatively affect design clock
speed (fMAX).
Type
Enumeration
Values
• Auto
• Off
• On
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 MUX_RESTRUCTURE <value>
set_global_assignment -name MUX_RESTRUCTURE -entity <entity name> <value>
set_instance_assignment -name MUX_RESTRUCTURE -to <to> -entity <entity
name> <value>
Default Value
Auto
Example
set_global_assignment -name mux_restructure off
set_instance_assignment -name mux_restructure on -to accel
134 MUX_RESTRUCTURE
MNL-Q21005
2015.05.04
Altera Corporation Quartus Settings File Reference Manual
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