How to set up GTL Ref Values for 45nm & 65nm

[playground]

No one said all boards have the mv setting. Only some do, other have multipliers and DFI's have something different again.

Intel state a GTL multiplier of 0.65 - 0.69 be used. Most use 0.667 to start with.

This can be made more complex but basically you want to aim initially for around 0.80v Vref, so if you have 1.16 Vtt, to find the correct multi to give you ~0.8v you go:

0.8v divided by 1.16v = 0.689v so you you'd choose the closest multiplier you have to 0.689.

Say you then raised the Vtt to 1.25v. To maintain the Vref at ~0.80v you'd go:

0.80 divided by 1.25v = 0.64v, so you'd choose the closest multiplier you have to 0.64.

Make sense?

You also want to keep the Vref under ~1.0v max.

ok i understand (doesnt work for me) but what with NB GTL?