EP2S90F1020C4 Datasheet, PDF (19/238 Pages) Altera Corporation – Section I. Stratix II Device Family Data Sheet

Stratix II Architecture
Figure 2–7. ALM in Normal Mode Note (1)
dataf0
datae0
datac
dataa
datab
datad
datae1
dataf1
4-Input
LUT
4-Input
LUT
combout0
dataf0
datae0
datac
dataa
datab
combout1
datad
datae1
dataf1
5-Input
LUT
combout0
5-Input
LUT
combout1
dataf0
datae0
datac
dataa
datab
datad
datae1
dataf1
dataf0
datae0
datac
dataa
datab
datad
datae1
dataf1
5-Input
LUT
3-Input
LUT
5-Input
LUT
combout0
combout1
dataf0
datae0
dataa
datab
datac
datad
combout0
dataf0
datae0
dataa
datab
datac
datad
4-Input
LUT
combout1
datae1
dataf1
6-Input
LUT
combout0
6-Input
LUT
combout0
6-Input
LUT
combout1
Note to Figure 2–7:
(1) Combinations of functions with fewer inputs than those shown are also supported. For example, combinations of
functions with the following number of inputs are supported: 4 and 3, 3 and 3, 3 and 2, 5 and 2, etc.
The normal mode provides complete backward compatibility with four-
input LUT architectures. Two independent functions of four inputs or less
can be implemented in one Stratix II ALM. In addition, a five-input
function and an independent three-input function can be implemented
without sharing inputs.
Altera Corporation
May 2007
2–11
Stratix II Device Handbook, Volume 1