ƒ Caches take advantage of locality to speed up most data accesses. — Increasing the block size can take advantage of spatial locality. — Increasing cache associativity helps reduce the miss rate. ƒ Today we'll finish up with associativity and do two more things. — We'll try to quantify the benefits of different cache designs, and see how caches affect overall performance. — We'll also investigate some main memory organizations that can help increase memory system performance. ƒ Next Monday we'll introduce some of the issues involved with writing to caches, and talk about cache configurations in modern processors.

Correspondence Address: (57) ABSTRACT CARLSON, GASKEY & OLDS, P.C. 4OO WEST MAPLE ROAD SUTE 350 BIRMINGHAM, MI 48009 (US) Brushed DC electric motors have a rotor with commutator portions moving into and out of contact with brushes. As each of these contacts end, a back EMF force is induced into a main current Supply signal. The number of these periodic (73) Assignee: Masco Corporation forces can be counted and utilized to identify the position of (21) Appl. No.: 11/134,925 the component being rotated by the DC electric motor. This method is relatively insensitive to environmental changes, (22) Filed: May 23, 2005 and thus more accurate than the existing art.