Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–125
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED _THROUGH_MODE_SETTING_DONT_CARE
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED
_THROUGH_MODE_SETTING_DONT_CARE
Type
Allows you to specify whether you want the TimeQuest Timing Analyzer to evaluate
timing constraints between the write and the read operation of the MLAB memory
block. Performing a write and read operation simultaneously at the same address
might result in metastability because no timing constraints between those operations
exist by default. Turning on this option introduces timing constraints between the
write and read operation on the MLAB memory block and thereby avoids
metastability issues; however, turning on this option degrades the performance of the
MLAB memory blocks. If your design does not perform write and read operations
simultaneously at the same address you do not need to set this option.
Boolean
Device Support
This setting can be used in projects targeting the following device families:
■ Arria II GX
■ Arria II GZ
■ Arria V
■ Cyclone V
■ HardCopy III
■ HardCopy IV
■ Stratix III
■ Stratix IV
■ Stratix V
Notes
This assignment supports wildcards.
This assignment is included in the Fitter report.
Syntax
set_global_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_
CARE -entity
set_instance_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_
CARE -to -entity
set_global_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_
CARE
June 2012 Altera Corporation Quartus Settings File
Reference Manual