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Beginner
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Time voilate with GPIO/DDIO in Arria 10

I have 8 groups 64 lines LVDS input, and 3 group of them received with GPIO, 5 group received with SERDES IP, but setup and hold time is not satisfyied

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Beginner
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Re: Time voilate with GPIO/DDIO in Arria 10

Help

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Moderator
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Re: Time voilate with GPIO/DDIO in Arria 10

Hi lijian50,

 

Please allow me some time to look into it.

I'm downloaded and compiled your design.

 

Thanks

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Moderator
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Re: Time voilate with GPIO/DDIO in Arria 10

Hi ljian50,

 

When you say "setup and hold time is not satisfied", can you elaborate more?

How much you get for setup and hold time?

 

Thanks

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Beginner
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Re: Time voilate with GPIO/DDIO in Arria 10

This is one time run result. I use PLL phase in SDC file to adjust the timing result, but never succed. Hold time even is larger than 3.571ns(280MHz). I don't know how to satisfy the timing . Is there anything else i forget to do with my SDC file?timing_result.png

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Beginner
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Re: Time voilate with GPIO/DDIO in Arria 10

If DDIO sample with the input clock from pin, and I change the data time delay from pin to DDIO input use INPUT_DELAY_CHAIN in .QSF file, hold time is never satisfied. The result is belowclk_pin_timing.png

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New Contributor I
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Re: Time voilate with GPIO/DDIO in Arria 10

@ShafiqY_Intel​ 

Hi ,I am a colleague of ljian50, pls see AFE5809 datasheet section 7.10 and 8.3.8 for LVDS time requirements. (https://www.ti.com.cn/lit/ds/symlink/afe5809.pdf?ts=1591957198622&ref_url=https%253A%252F%252Fwww.ti...

We heard that A10 IC have some problem related to silicon and can not close the timing for DDIO, but not sure if this is true.

@KhaiY_Intel​ I noticed you answered on a similar question some months ago, would you pls also help take a look on this question? Thanks!

https://forums.intel.com/s/question/0D50P00004Q8inFSAR/using-ddioin-to-read-adc-data-and-timing-anal...

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Beginner
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Re: Time voilate with GPIO/DDIO in Arria 10

Hello

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