Altera Stratix II devices are built using a new and innovative logic structure called the adaptive logic module (ALM) to make Stratix II devices the industry’s biggest and fastest FPGAs. The ALM packs more combinational logic into less area, providing a higher logic density than a standard four-input look-up table (LUT) architecture and more logic per register. With the Stratix II ALM architecture, the Quartus II software can reduce the number of levels of logic as well as the routing requirements for a Stratix II design. In this white paper, Altera demonstrates that Stratix II devices are larger and more logic efficient than Virtex-4.