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Regarding virtual clock warning while loading Timing constraints

Hi,

CTE reading timing constraint file '/remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc' ...
**WARN: (TCLCMD-1142): Virtual clock 'V_OUT_clk' is being created with no source objects. (File /remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc, Line 5).

**WARN: (TCLCMD-1142): Virtual clock 'V_OUT_clk_v0' is being created with no source objects. (File /remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc, Line 6).

**WARN: (TCLCMD-1142): Virtual clock 'V_OUT_clk_v0_setuphold' is being created with no source objects. (File /remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc, Line 7).

**WARN: (TCLCMD-1142): Virtual clock 'V_clk' is being created with no source objects. (File /remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc, Line 8).

**WARN: (TCLCMD-1142): Virtual clock 'V_clk_v0' is being created with no source objects. (File /remote/home/kakumanu/NEW_BLOCKS/pd/cipher/ganga_5th_july2012/inputs/cipher.sdc, Line 9).

Iam geeting the above warning..

what is the meaning of that warning technically..

waiting for answer...

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