Blending fixed-architecture solutions with Application Specific Instruction-set Processor tools, Tensilica® Xtensa® LX6 and Xtensa 11 processors include core Xtensa instruction set architecture. Flexible length instruction extensions for Xtensa LX6 allow very long instruction word (VLIW) instructions from 4–16 bytes. Other features include option for run-time power-down of portions of cache memories, data cache block prefetch, and reduced dynamic switching power of processor logic gates.