Altera Quartus II Settings File - Manual (Page 147)

PRESERVE_REGISTER
Prevents a register from minimizing away during synthesis and prevents sequential netlist optimizations.
Sequential netlist optimizations can eliminate redundant registers and registers with constant drivers.
Type
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment supports Fitter wildcards.
This assignment supports synthesis wildcards.
Syntax
set_global_assignment -name PRESERVE_REGISTER -entity <entity name> <value>
set_instance_assignment -name PRESERVE_REGISTER -to <to> -entity <entity
name> <value>
Example
set_instance_assignment -name preserve_register on -to foo
MNL-Q21005
2015.05.04
PRESERVE_REGISTER 147
Quartus Settings File Reference Manual Altera Corporation
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