Late to the party here but I didn't see until now.
Looking at the layout I'm very confident this controller is fully analog, with just a few gates of digital doing control stuff. There's only a few dozen to maaaaybe low hundreds of gates of digital in the whole die, not nearly enough to be any kind of MCU.
And there's a whole bunch of really large resistors and other analog stuff.
I do see a structure that might be some kind of ROM for piecewise linear calibration curves, but it's too obscured by wiring on top for me to draw any definitive conclusions without delayering the chip.
Yeah it's always tricky to decide how much detail to include in these posts. If I had gone on a whole explanation of the full 7 series GTX clocking architecture the post would easily have been another few pages in length.
Looking at the layout I'm very confident this controller is fully analog, with just a few gates of digital doing control stuff. There's only a few dozen to maaaaybe low hundreds of gates of digital in the whole die, not nearly enough to be any kind of MCU.
And there's a whole bunch of really large resistors and other analog stuff.
I do see a structure that might be some kind of ROM for piecewise linear calibration curves, but it's too obscured by wiring on top for me to draw any definitive conclusions without delayering the chip.