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Differential SSTL_18 voltage levels

Altera_Forum
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I am confused about the input voltage levels for differential SSTL_18.  

cyc3_ciii52001.pdf page 1-13 has a table that shows the levels for Vswing(DC), Vx(AC), Vswing(AC), and Vox(AC). I do not know what they mean. Can someone explain or post a drawing of the waveforms showing the acceptable voltage levels? 

 

Thanks 

 

Bob
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Altera_Forum
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