Teledyne LeCroy Eye Doctor II - Manual (Page 15)

Operator's Manual
Lane1 (left) is configured with emphasis removal turned off, and is shown for reference. (The Emp trace is
equal to SDAInput). Note that the Emp trace shows emphasis: bits after a rising transition are higher, and
after a falling transition are lower than successive bits. The eye diagram also shows the effects of added
emphasis.
Lane2 (center) is configured to remove pre-emphasis. The Emp trace shows that the emphasized levels of
the transitional bits (the first bit after a rising or falling edge) have been attenuated to meet the voltage
levels of the non-transitional bits.
Lane2 (center) is configured to remove de-emphasis. The Emp trace shows that the de-emphasized levels
of the non-transitional bits (bits that are not the first bit after a rising or falling edge) have been amplified
to meet the voltage levels of the transitional bits.
Custom Emphasis
Custom emphasis allows you to enter up to 8 tap values for a custom FFEtapped delay line filter.
Custom emphasis setup
922961 Rev A 13