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TMS320C6657: CORECLK Tr/Tf requirements

Koichiro Tashiro
Mastermind 21590 points
Part Number: TMS320C6657

Hi,

I have a question from my customer for CORECLK Tr/Tf requirements.
According to table 8 in Hardware design guide, Tr/Tf requirements are below.
https://www.ti.com/jp/lit/an/sprabi2d/sprabi2d.pdf



Does this mean Tr/Tf should be measured 250mVp-p with 0V center 10%-90% (Tf_2 in below waveform) ?



If Tf is measured 10%-90% of full signal swing (Tf_1 in above waveform), these requirements are not met.

Thanks and regards,
Koichiro Tashiro