PDF explaining LUT masks

[Altera_Forum]

At one point I found a pdf on Altera's site that describes the LUT mask relation to the function of the LUT. I cannot find it any more. Does anyone have a link, or can tell me how to tell what a cycloneii_lcell is doing based on its sum_lutc_input and lut_mask inputs?

[Altera_Forum]

is this the one? 

 http://www.altera.com/literature/cp/cp-01006.pdf

[Altera_Forum]

No, it was a part of regular Altera literature. I remember it explained both arithmetic and regular mode, and related the lutmasks to the operation.

[Altera_Forum]

Locate the LCELL in the Technology Map Viewer and double-click on it so it shows the contents inside(I'm not sure if it works in all cases, but have used that before). Works if it's one or two LUTs you're looking at, but becomes arduous pretty quickly.