# What are ALMs, LEs and ALUTs?

Does ALM mean "Adaptive logic module"?

www.altera.com/literature/ds/ds_nios2_perf.pdf‎ Jul 1, 2013 -

One ALUT is equivalent to about 1.25 LEs.

Does LE mean logic element and ALUT means adaptive look-up table?

• Not a good one... This is as close as I got, but it looks out of date (Xilinx's devices stop at Spartan 2 in the table!): altera.co.uk/cgi-bin/device_compare.pl - it says Altera's and Xilinx's basic building block is a 4-input look-up table (LUT), a flip-flop and some additional circuitry that Altera calls a logic element (LE) and Xilinx calls a logic cell (LC).  – Martin Thompson Oct 22 '13 at 15:22