AR# 9586

Virtex/-E - How long must a reset be applied to a DLL in order to reset it?

Description

How long must a reset be applied to a DLL in order to reset it?

Solution

A reset needs to be asserted for approximately only 2 ns.  

 

Approximately four clock cycles are needed for the delayed clocks to be flushed out of the DLL. 

 

When CLKDLL is configured with external feedback, a RESET after configuration is recommended. Please see (Xilinx Answer 14425) for more information.

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AR# 9586
Date 05/14/2014
Status Archive
Type General Article