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Participant
Participant
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Registered: ‎06-17-2015

ZCU111 DAC REFERENCE CLOCK

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I am trying to understand the relationship between the sysref_in and the dac0_clk inputs of the Zynq Ultrascale+ RF Data Converter.

Should the sysref_in be the same frequency as the dac0_clk?  Can they be different?

If you could point me in the right direction I would greatly appreciate it.

 

Thanks,

 

Jorge Gonzalez

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Moderator
Moderator
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Registered: ‎04-18-2011

You need to refer to the product guide PG269 here. 

The input clock to the DAC tile can either be the sample clock or it can act as the reference clock for the PLL in that DAC tile. 

Sysref if needed for multi tile synchronisation. It acts as a timing reference for the system and it runs very slow compared to the DAC clock(although it is required to be an integer sub multiple of the DAC clock) 

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Moderator
Moderator
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Registered: ‎04-18-2011

You need to refer to the product guide PG269 here. 

The input clock to the DAC tile can either be the sample clock or it can act as the reference clock for the PLL in that DAC tile. 

Sysref if needed for multi tile synchronisation. It acts as a timing reference for the system and it runs very slow compared to the DAC clock(although it is required to be an integer sub multiple of the DAC clock) 

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Participant
Participant
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Registered: ‎06-17-2015

Thanks for your quick reply klumsde.

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