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Participant
Participant
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Registered: ‎08-09-2013

about GTY bandwidth for ZU11EG.

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Dear Xilinx SerDes Expert.

When I review the DC report, there are two differenct things for GTY spec. (0.85V, speedgrade -1, XCZU11EG-1FF1716I)

In the V1.16(July,2019), DS925, the spec is 9.8 to 12.5bps using QPLL0 (DIV1). However, in the recent version(v1.17, march, 2020), DS925, the spec for GTY is from 9.8 to 16.375 using QPLL0.

According to the recent datasheet, the range for GTY is upgraded. Is it right?? or this is typo??

Since, we will use the JESD204B at 14Gbps. However, the tool for JESD is not working at 14Gbps, even thought the GTY is upgraded.

Could you give us which is right and why JESD204B IP is not making the IP at 14Gbps.

 

Thanks and Regrads,

 

Sun

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Xilinx Employee
Xilinx Employee
293 Views
Registered: ‎03-30-2016

Hello Sun @sunkim


I am not a Forum moderator, so could you please accept my previous asnwer as a solution ?.
BTW, Vivado 2020.1 will have update on JESD PHY GUI, so GUI will correctly limit the line-rate setting to avoid confusion.

Thanks
Leo

View solution in original post

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Xilinx Employee
Xilinx Employee
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Registered: ‎03-30-2016

Hello @sunkim 

I cannot find your device model in the default Vivado 2019.2, So, I used xczu11eg-ffvc1760-1-i instead.
Confirmed that I am able to generate JESD204B_PHY and JESD204 IP with 14Gbps line-rate without any issue.

JESD204_GTY_14G.jpg


Are you using Vivado 2019.2 version ?

Thanks & regards
Leo

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Participant
Participant
373 Views
Registered: ‎08-09-2013

Dear Xilinx SerDes Engineers.

 

Even though the 14Gbps is OK on the GUI, they cannot synthesize the IP. I guess that the limitation is 12.5G bps for -1(speedgrade).

Could you try to make the JESD204B IP again?

 

Thanks,

 

Sun

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Xilinx Employee
Xilinx Employee
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Registered: ‎03-30-2016

Hello @sunkim 

Okay, let me try to reproduce.
I will give you a feedback on this.

Thanks
Leo

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Xilinx Employee
Xilinx Employee
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Registered: ‎03-30-2016

Hello Sun @sunkim 

It seems that you are correct that JESD204B cannot be generated with line-rate above 12.5Gbps.
I found in PG198 that only 12.5 Gbps is supported. So, current GUI behavior is expected. 
JESD204B_is_limited_to_12.5G.jpg

Digging deeper into this topic, I found that Line-rate above 12.5Gbps is only supported with user data width above 64,
While JESD204B PHY is using GTY with user width=32, max supported line-rate is 12.5Gbps.
GTY_14Gbps_is_not_supported_with_32.jpg

 

Thanks & regards
Leo

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Participant
Participant
296 Views
Registered: ‎08-09-2013

Hi, Leo.

 

I can understand clearly. Could you close this issue.

 

thanks,

 

Sun

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Xilinx Employee
Xilinx Employee
294 Views
Registered: ‎03-30-2016

Hello Sun @sunkim


I am not a Forum moderator, so could you please accept my previous asnwer as a solution ?.
BTW, Vivado 2020.1 will have update on JESD PHY GUI, so GUI will correctly limit the line-rate setting to avoid confusion.

Thanks
Leo

View solution in original post