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Voyager
Voyager
845 Views
Registered: ‎05-30-2017

Ultrazed-EV 3G-SDI default reference clock 250 MHz

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Hello, in Ultrazed-EV SOM+Carrier card the default reference clock on boot for 3G-SDI RX/TX is 250MHz and not 148.5 MHz as I could expect. Is this reference clock good to feed sdi gigabit transceiver in Zynq Ultrascale+?

Thanks,

Pierluigi

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1 Solution

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Moderator
Moderator
803 Views
Registered: ‎04-12-2017

Re: Ultrazed-EV 3G-SDI default reference clock 250 MHz

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Hello @pierlum,

It's better if you drive the system for 148.5Mhz as mentioned UHD_SDI product guide PG289/290.

You can down-sample the clock values using MMCM and PLL. Please follow XAPP888 it will help you better on this with detailed steps.

https://www.xilinx.com/support/documentation/application_notes/xapp888_7Series_DynamicRecon.pdf

Thank you

 

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3 Replies
Moderator
Moderator
804 Views
Registered: ‎04-12-2017

Re: Ultrazed-EV 3G-SDI default reference clock 250 MHz

Jump to solution

Hello @pierlum,

It's better if you drive the system for 148.5Mhz as mentioned UHD_SDI product guide PG289/290.

You can down-sample the clock values using MMCM and PLL. Please follow XAPP888 it will help you better on this with detailed steps.

https://www.xilinx.com/support/documentation/application_notes/xapp888_7Series_DynamicRecon.pdf

Thank you

 

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Voyager
Voyager
761 Views
Registered: ‎05-30-2017

Re: Ultrazed-EV 3G-SDI default reference clock 250 MHz

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Thank you very much.  There is on the carrier card a frequency syntetyzer and by default 3 output frequencies are 148,5 MHz (not for SDI) and 1 frequency dedicated to SDI is 250MHz and not 148,5 MHz as the others.  I can also riconfigurate it to 148,5MHz using I2C but I also wanted understand because AVNET chose this strange default value.

 

Thanks,

Pierluigi

Newbie raminzk
Newbie
333 Views
Registered: ‎04-28-2019

Re: Ultrazed-EV 3G-SDI default reference clock 250 MHz

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That is a shame that AVNET did not give an implemented ref design on ULTRAZED. most of my time consumed to port ZCU106 ref designs to ULTRAZED and I was not successful yet.

you should use 148.5MHz CLK for SDI ref. there is an aux clk with 148.5 MHz which is exactly at the same quad(quad227) which SDI rx input is. so you can simply select that clk with GTREFCLK0 selection at UHD-SDI IP.