DS90CR216: RSKM minimum for the DS90CR216

Zeev Gerber

Intellectual 500 points

Part Number: DS90CR216

Hi,

I need to know the minimum RSKM for the DS90CR216 when working with f = 25 Mhz.

this information didn't found at the DS. (only for f =40 Mhz and f = 66 Mhz)

My cable is 2 m long with parameter bring me to 300 ps skew.

need to find if I could work safely with these condition.

clock jitter and ISI are parameter I didn't have spec for them.

Regards

Zeev Gerber

over 5 years ago

0 Ikechukwu Anyiam over 5 years ago

TI__Mastermind 35130 points

Hi Zeev,

You can use the equations in section 4 of this document to calculate the RSKM: www.ti.com/.../snla249.pdf

Regards,
I.K.

0 Zeev Gerber over 5 years ago in reply to Ikechukwu Anyiam

Intellectual 500 points

Hi,

TI didn't give spec for working with f=25 Mhz.

This answer is useless.

my calculting show this devise (DS90CR216) have probmlatic timing to use with general purpose application of serdes.

I decide not to use it.

Zeev Gerber

0 Ikechukwu Anyiam over 5 years ago in reply to Zeev Gerber

TI__Mastermind 35130 points

Hi Zeev,

I believe the answer is sufficient. The application note I linked states "To determine the minimum RSKM value, the Tx pulse positions and Rx strobe positions for the maximum operating frequency should be used."

These values are provided in the DS90CR216 datasheet. You can then calculate RSKM with equations 1, 2, and 3 on page 5 of the application note for your operating frequency. There are even examples provided to walk you through the calculations.

Regards,
I.K.

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DS90CR216: RSKM minimum for the DS90CR216