One should enter Total Spread as a value in Spread spectrum devices configuration softwares like CyberClocks Online available at: http://www.ss4emi.com/
So when Center Spread of +/-2.5% is desired, one needs to enter the total spread as 5.
For Downspread of 5%, the value is 5.
Example Devices: CY25100 and CY25200.
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