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AR# 13712

Virtex/E/II, Spartan-II/IIE - CLKDLL/DCM: How many OBUFs can I drive directly from a CLKDLL/DCM?

Description

Page 8 of the Xilinx Application Note "Using The Virtex Delay Locked Loop" (Xilinx XAPP132) states:

"The DLL clock outputs can drive an OBUF, a global clock buffer BUFG, or they can route directly to destination clock pins."

How many OBUFs can DLLs drive practically?

Solution

You can connect as many OBUFs as are needed.

However, only the output clock that is fed back into CLKFB will be deskewed.

AR# 13712
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article