Q: For the 13V drive mode (VHH), is a new pattern generator required? This would be in comparison to the regular drive mode.
A: The VHH mode on the MAX9979 is controlled through the internal register bits (ENVHHSx) or the external, single-ended pins (!ENVHHPx). This signal is not designed to be a high-speed interface. The waveform is noted in TOC 51 of the datsheet:
Figure 3. Driver Block Diagram” on page 39 of the data sheet also shows the internal logic for setting the VHH output: