Pre-emphasis Control Signal

Assuming a 1100 pattern preceded by a 0, the pre-emphasis waveform is defined in the following image.

• Every transition bit is boosted to VPP.
• The pre-emphasis percentage is defined as VPP/VS - 1
  • VPP = differential emphasized voltage (peak-to-peak)
  • VS = differential steady-state voltage (peak-to-peak)