Should the GC and QBC clock be from the same source

[niu_zun]

Hello ，I wonder if the gc and  the QBC being from the same source will provide better performance or not？I

[bpatil]

Hello @niu_zun 

Can you please provide details on you usage and application?

[niu_zun]

hello @bpatil 。I read the scematic of VCU118 with XCBU9P. I found the clock of the QBC pin for the DDR4 interface  doesn't have the same source as the GCLK.  I want to design an application reading data from the DDR4 SDRAM,SO I want to know why not provide identifical  source for the QBC and GC?I think the same source can be more accrate for reading and writing.

Thank you