Agilent Technologies 93000 SOC Series Training Manual page 148

Defining the Levels 8-1 AC Levels
the level setup. You have to control the driver in the timing setup,
that is you have to drive a 1 if you want to terminate with vih and
you have to drive a 0 if you want to terminate with vil.
In general, the termination voltage is in the middle of the range
between voh and vol.
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Agilent 93000 SOC Series User Training Part 1, October 2004