Altera Quartus II Settings File - Manual (Page 133)

MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_S
ETTING_DONT_CARE
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 simulataneously at the same address you do not need to set
this option.
Type
Boolean
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment supports Fitter wildcards.
This assignment is included in the Fitter report.
This assignment supports synthesis wildcards.
Syntax
set_global_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_CARE -
entity <entity name> <value>
set_instance_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_CARE -to
<to> -entity <entity name> <value>
set_global_assignment -name
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SETTING_DONT_CARE
<value>
Default Value
Off
MNL-Q21005
2015.05.04
MLAB_ADD_TIMING_CONSTRAINTS_FOR_MIXED_PORT_FEED_THROUGH_MODE_SE
TTING_DONT_CARE
133
Quartus Settings File Reference Manual Altera Corporation
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