EP2S15 datasheet(18/238 Pages) ALTERA

18 / 238 page

2–10

Altera Corporation

Stratix II Device Handbook, Volume 1

May 2007

Adaptive Logic Modules

synchronous load, and clock enable control for the register. These LAB-

wide signals are available in all ALM modes. See the “LAB Control

Signals” section for more information on the LAB-wide control signals.

The Quartus II software and supported third-party synthesis tools, in

conjunction with parameterized functions such as library of

parameterized modules (LPM) functions, automatically choose the

appropriate mode for common functions such as counters, adders,

subtractors, and arithmetic functions. If required, you can also create

special-purpose functions that specify which ALM operating mode to use

for optimal performance.

Normal Mode

The normal mode is suitable for general logic applications and

combinational functions. In this mode, up to eight data inputs from the

LAB local interconnect are inputs to the combinational logic. The normal

mode allows two functions to be implemented in one Stratix II ALM, or

an ALM to implement a single function of up to six inputs. The ALM can

support certain combinations of completely independent functions and

various combinations of functions which have common inputs.

Figure 2–7 shows the supported LUT combinations in normal mode.

EP2S15 Datasheet(PDF) 18 Page - Altera Corporation