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147 Views
Registered: ‎05-22-2018

How to extract merits of Dynamic Phase Shift Interface and MMCM dynamic reconfiguration?

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Hi everyone,

I am using Dynamic Phase Shift Interface and MMCM dynamic reconfiguration methods through DRP(Dynamic Reconfiguration Port) together to achieve a phase shift resolution of (1/56)th of the VCO time period(T_VCO) using dynamic phase shift interface and independant control on output clocks using the other method.

However there are limitations

1)Using the former, I will have a common control of output clocks with phase shift resolution of (1/56)T_VCO.

2)Using the latter, I will have independent control of output clocks with phase shift resolution of (1/8)T_VCO

 

Is there a way to have independent control of output clocks along with phase resolution of (1/56)T_VCO?

 

Thanks in advance

 

-Chandrasekhar DVS

 

 

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Moderator
Moderator
119 Views
Registered: ‎08-08-2017

Re: How to extract merits of Dynamic Phase Shift Interface and MMCM dynamic reconfiguration?

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Hi @krishnachandrasekhar100 

As you know the attribute CLKOUT[0:6]_USE_FINE_PS  select the output clocks to be dynamically phase shifted. The dynamic phase shift amount is common to all the output clocks selected , there is no way to have independent control of output clocks with fine phase shift resolution.

Additionally the Application note XAPP888 pointed out by @csattar does not support outputs configured with fine-phase shifting enabled. 

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2 Replies
Moderator
Moderator
129 Views
Registered: ‎05-02-2017

Re: How to extract merits of Dynamic Phase Shift Interface and MMCM dynamic reconfiguration?

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hi @krishnachandrasekhar100 ,

 

can you please once cross check with following xapp

 

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

 

https://www.xilinx.com/support/documentation/application_notes/xapp878.pdf

 

chandra

Regards
Chandra sekhar
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Moderator
Moderator
120 Views
Registered: ‎08-08-2017

Re: How to extract merits of Dynamic Phase Shift Interface and MMCM dynamic reconfiguration?

Jump to solution

Hi @krishnachandrasekhar100 

As you know the attribute CLKOUT[0:6]_USE_FINE_PS  select the output clocks to be dynamically phase shifted. The dynamic phase shift amount is common to all the output clocks selected , there is no way to have independent control of output clocks with fine phase shift resolution.

Additionally the Application note XAPP888 pointed out by @csattar does not support outputs configured with fine-phase shifting enabled. 

-------------------------------------------------------------------------------------------------------------------------------
Reply if you have any queries, give kudos and accept as solution
-------------------------------------------------------------------------------------------------------------------------------