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Explorer
Explorer
89 Views
Registered: ‎10-12-2016

why MMCM/PLL need BUFG feed back ?

HI Friends,

1) why MMCM/PLL need BUFG feed back ?

2) can i use BUFH instead of BUFG ?

3) can i remove BUFG ? Is there any problem if i remove it ?

 

BUFG_feedback_post.png

For any help or suggestion it is highly appreciated.

Thank you

S Sampath

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1 Reply
Moderator
Moderator
80 Views
Registered: ‎01-16-2013

Re: why MMCM/PLL need BUFG feed back ?

@ssampath

 

Check MMCM with Internal feedback:

https://www.xilinx.com/support/documentation/user_guides/ug472_7Series_Clocking.pdf#page=93

 

Also check this forum discussions:

https://forums.xilinx.com/t5/Timing-Analysis/MMCM-feedback-with-BUFG/td-p/769657

 

--Syed

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Did you check our new quick reference timing closure guide (UG1292)?
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