The MPC2605 is a single chip, 256KB integrated lookaside cache with copyback capability designed for PowerPC applications (MPC603 and MPC604). Using 0.38 m technology along with standard cell logic technology, the MPC2605 integrates data, tag, host interface, and least recently used (LRU) memory with a cache controller to provide a 256KB, 512KB, or 1 MB Level 2 cache with one, two, or four chips on a 64bit PowerPC bus.