Altera Quartus II Settings File - Manual (Page 766)

SYNCHRONIZER_TOGGLE_RATE
Specifies the toggle rate of this register. The units for this value are in transitions per second, and must be
positive. This is used when calculating the Mean Time Between Failures (MTBF) of a synchronizer chain
in the Metastability Report. This only applies when the TimeQuest Timing Analyzer is used. You can
specify the desired frequency setting on the first register of a synchronizer chain, and this will determine
the data rate used in the MTBF estimation. There are two other assignments associated with toggle rates.
The I/O Maximum Toggle Rate is only used for pins, and specifies the worst-case toggle rates used for
signal integrity purposes. The Power Toggle Rate assignment is used to specify the expected time-
averaged toggle rate, and is used by the Power Analyzer to estimate time-averaged power consumption.
Type
Integer
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment supports Fitter wildcards.
Syntax
set_instance_assignment -name SYNCHRONIZER_TOGGLE_RATE -to <to> -entity
<entity name> <value>
766 SYNCHRONIZER_TOGGLE_RATE
MNL-Q21005
2015.05.04
Altera Corporation Quartus Settings File Reference Manual
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