Quartus II Settings File Reference Manual - Altera

4–78 Chapter 4: Analysis & Synthesis Assignments
HDL_INITIAL_FANOUT_LIMIT
HDL_INITIAL_FANOUT_LIMIT
Type
Directs the Quartus II Integrated Synthesis to check the initial fan-out of each net in
the netlist immediately after elaboration but prior to any netlist optimizations. If the
fan-out for a net in the post-elaboration netlist exceeds the specified limit, the Quartus
II Integrated Synthesis issues a warning. The post-elaboration netlist is the initial
netlist created by elaborating a single entity in your HDL source. Later synthesis and
fitter optimizations may reduce or increase the fan-out of the nets in the netlist.
This option is useful for identifying high-fanout signals early in the design process.
This option is ignored if applied to anything other than an entity or an instance of an
entity.
Integer
Device Support
This setting can be used in projects targeting any Altera device family.
Syntax
set_global_assignment -name HDL_INITIAL_FANOUT_LIMIT -entity
set_instance_assignment -name HDL_INITIAL_FANOUT_LIMIT -to -entity
Example
set_instance_assignment -name hdl_initial_fanout_limit 100 -to foo
Quartus Settings File June 2012 Altera Corporation
Reference Manual