Dvd/cd Servo - Atmel Corporation

The Atmel AT78C1502 high-performance servo controller fully integrates all of the control and demodulation functions for DVD and CD, optical/mechanical systems. Packaged in 128-lead TQFP and fabricated in 0.35 micron CMOS, the device oper- ates on a 3.3V Logic Analog supply and provides 5V tolerance for digital I/O. An AVR- based Servo Processing Unit (SPU) embedded in the device provides programmable control of spindle speed, coarse and fine tracking, focus, sled, draw motor and tilt. The three parallel programmable AVR Microcontrollers in the SPU are the heart of the sys- tem, offering a range of servo sample rates. With only a 40 MHz system Clock 120 MIPS of processing power is provided. Real-time notch Filters CAN also be calculated. Fast 10-bit DACs provide real-time control of servo loops and other system adjust- ments. A universal serial port and many general purpose I/Os are provided. AVR0 is the master AVR of the three microcontrolloers, communicating with AVR1, AVR2 and the ARMTDMI in the AT78C1501 Interface controller and to the AT78C1503 read channel. An On-Chip Debugger Monitor (OCDM) is offered to enable program- mers to easily observe theeffect of changes to code on each AVR System-level evaluation boards are available with development code in both C and native code for basic operation of all servos. Simple changes to the code allow any mechadeck to be interfaced to the AT78C1502. By ATMEL Corporation