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AR# 12548

Virtex-II, DCM - Is it possible to increment the phase shift by more than 1/256 step using Variable Phase Shift?

Description

Can I use PSINCDEC to increment the phase shift by more than 1/256 by setting the PHASE_SHIFT value?

Is it possible to increment or decrement the phase shift by more than 1/256 step using Variable Phase Shift?

Solution

No. To use the PSINCDEC value, the CLKOUT_PHASE_SHIFT attribute must be set to "VARIABLE". In this mode, the PHASE_SHIFT value is used only as the starting point. After this, the clock will shift by 1/256 only. There is no way to increment the phase shift by PHASE_SHIFT/256.

Please see (Xilinx Answer 13824) and (Xilinx Answer 11936) for more information on the DCM phase shift feature.

AR# 12548
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article