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About Encounter Warning TA-549

admin

hi All:

I get the following message when run timing analysis:

--> WARNING: Pin msd_ddr_phy/ddr_sstl/dll_ato_io125/AE is driven ZERO and
             X simultaneously, preserving X. .
--> WARNING: Pin msd_ddr_phy/ddr_sstl/dll_dto_0_io121/OJ is driven ZERO and
             X simultaneously, preserving X. .


Why? Does it relate to constant propagation? where comes the X?

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