Computers as Components, 2nd Edition

7.8 Design Example: Digital Still Cameras 381

The file system of the player generally must be compatible with PCs. CD/MP3

players used compact discs that had been created on PCs. Today’s players can be

plugged into USB ports and treated as disk dr ives on the host processor.

The Cirrus CS7410 [Cir04B] is an audio controller designed for CD/MP3 play-

ers. The audio controller includes two processors. The 32-bit RISC processor is

used to perform system control and audio decoding. The 16-bit DSP is used to

perform audio effects such as equalization. The memory controller can be inter-

faced to several different types of memory: flash memory can be used