Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–173
SYNTHESIS_KEEP_SYNCH_CLEAR_PRESET_BEHAVIOR_IN_UNMAPPER
SYNTHESIS_KEEP_SYNCH_CLEAR_PRESET_BEHAVIOR_IN_UNMAPPER
Type
When this option is set to On, synthesis keeps the synchronous clear or preset
behavior when remapping the I/O WYSIWYG primitives (from other device families)
using the DDIO INPUT feature to the targeted device family.
For example, the DDIO INPUT of the Stratix III device family behaves differently
from Stratix II when you use synchronous clear or preset behavior. For the Stratix III
device family, the synchronous clear or preset behavior affects all three registers,
while it only affects the two capture registers in Stratix II.
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Syntax
set_global_assignment -name
SYNTHESIS_KEEP_SYNCH_CLEAR_PRESET_BEHAVIOR_IN_UNMAPPER -entity
set_instance_assignment -name
SYNTHESIS_KEEP_SYNCH_CLEAR_PRESET_BEHAVIOR_IN_UNMAPPER -to -entity
set_global_assignment -name
SYNTHESIS_KEEP_SYNCH_CLEAR_PRESET_BEHAVIOR_IN_UNMAPPER
Example
set_global_assignment -name
synthesis_keep_synch_clear_preset_behavior_in_unmapper on
set_instance_assignment -name
synthesis_keep_synch_clear_preset_behavior_in_unmapper on -to foo
June 2012 Altera Corporation Quartus Settings File
Reference Manual