AR #22095 - Virtex-4, Architecture Wizard - Can I use a Virtex-4 DCM with a negative fixed phase without a work-around?
Virtex-4, Architecture Wizard - Can I use a Virtex-4 DCM with a negative fixed phase without a work-around?
| AR# | 22095 |
| Part | Virtex-4 Family |
| Last Modified | 2006-11-09 00:00:00.0 |
| Status | Archive |
| Keywords | Phase, aligned, 13349, work around, workaround, clocking |
Description
Keyword: Phase, aligned, 13349, work around, workaround, clocking
Urgency : Standard
General Description:
I am instantiating a DCM using Architecture Wizard for a Virtex-4, and I receive a warning that negative fixed phase shift does not work. Is this true? What do I need to do?
Solution
Solution:For a design targeting Virtex-4 DCM, this is a false warning and can be safely ignored. There are no additional steps needed to give the DCM a negative fixed phase shift. Architecture Wizard will instantiate your DCM with a negative phase shift.
Otherwise, refer to (Xilinx Answer 13349) for more information.