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Quartus II Settings File Reference Manual - Altera

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6–346 Chapter 6: Fitter Assignments<br />

SYNCHRONIZER_TOGGLE_RATE<br />

SYNCHRONIZER_TOGGLE_RATE<br />

Type<br />

Specifies the toggle rate of this register. The units for this value are in transitions per<br />

second, and must be positive. This is used when calculating the Mean Time Between<br />

Failures (MTBF) of a synchronizer chain in the Metastability Report. This only applies<br />

when the TimeQuest analyzer is used. You can specify the desired frequency setting<br />

on the first register of a synchronizer chain, and this will determine the data rate used<br />

in the MTBF estimation. There are two other assignments associated with toggle<br />

rates. The I/O Maximum Toggle Rate is only used for pins, and specifies the worstcase<br />

toggle rates used for signal integrity purposes. The Power Toggle Rate<br />

assignment is used to specify the expected time-averaged toggle rate, and is used by<br />

the Power Analyzer to estimate time-averaged power consumption.<br />

Integer<br />

Device Support<br />

This setting can be used in projects targeting any <strong>Altera</strong> device family.<br />

Notes<br />

This assignment supports wildcards.<br />

Syntax<br />

set_instance_assignment -name SYNCHRONIZER_TOGGLE_RATE -to -entity<br />

<br />

<strong>Quartus</strong> <strong>Settings</strong> <strong>File</strong> June 2012 <strong>Altera</strong> Corporation<br />

<strong>Reference</strong> <strong>Manual</strong>

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