EP2S90F1020C4N Datasheet, PDF (49/238 Pages) Altera Corporation – The Stratix II family offers the following features

Stratix II Architecture
Figure 2–27 shows one of the columns with surrounding LAB rows.
Figure 2–27. DSP Blocks Arranged in Columns
DSP Block
Column
4 LAB
Rows
DSP Block
Altera Corporation
May 2007
2–41
Stratix II Device Handbook, Volume 1