ADSP-21990
TABLE OF CONTENTS
General Description ................................................. 3
DSP Core Architecture ........................................... 3
Memory Architecture ............................................ 5
Bus Request and Bus Grant ..................................... 6
DMA Controller ................................................... 6
DSP Peripherals Architecture .................................. 7
Serial Peripheral Interface (SPI) Port ......................... 7
DSP Serial Port (SPORT) ........................................ 8
Analog-to-Digital Conversion System ........................ 8
Voltage Reference ................................................. 9
PWM Generation Unit ........................................... 9
Auxiliary PWM Generation Unit .............................. 9
Encoder Interface Unit ........................................... 9
Flag I/O (FIO) Peripheral Unit ............................... 10
Watchdog Timer ................................................ 10
General-Purpose Timers ....................................... 10
Interrupts ......................................................... 10
Peripheral Interrupt Controller .............................. 11
Low Power Operation .......................................... 12
REVISION HISTORY
8/07—Rev. 0 to Rev. A
Added RoHS part number to Ordering Guide .............. 49
Clock Signals ...................................................... 12
Reset and Power-On Reset (POR) ........................... 13
Power Supplies ................................................... 13
Booting Modes ................................................... 13
Instruction Set Description .................................... 14
Development Tools .............................................. 14
Designing an Emulator-Compatible DSP Board .......... 15
Additional Information ........................................ 15
Pin Function Descriptions ........................................ 16
Specifications ........................................................ 19
Absolute Maximum Ratings ................................... 24
ESD Caution ...................................................... 24
Timing Specifications ........................................... 24
Power Dissipation ............................................... 40
Test Conditions .................................................. 40
Pin Configurations ................................................. 42
Outline Dimensions ................................................ 48
Ordering Guide ..................................................... 49
Rev. A | Page 2 of 50 | August 2007