Analog Devices adsp-2100 Manual page 2

Contents
2.2.7
2.2.8
2.3
2.3.1
2.3.2
2.3.2.1
2.3.2.2
2.3.2.3
2.3.2.4
2.3.2.5
2.3.2.6
2.3.2.7
2.4
2.4.1
2.4.2
2.4.2.1
2.4.2.2
2.4.2.3
2.4.2.4
2.4.2.5
CHAPTER 3
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.3
3.3.1
3.3.1.1
3.3.2
3.3.3
3.3.4
3.3.4.1
3.4
3.4.1
3.4.2
3.4.2.1
3.4.2.2
3.4.2.3
3.4.2.4
3.4.3
3.4.3.1
iv
Division ........................................................................................ 2-9
ALU Status .................................................................................. 2-13
MULTIPLIER/ACCUMULATOR (MAC) ................................... 2-13
MAC Block Diagram Discussion ............................................. 2-13
MAC Operations ........................................................................ 2-16
Standard Functions.............................................................. 2-16
Input Formats ....................................................................... 2-18
MAC Input/Output Registers ........................................... 2-18
MR Register Operation ....................................................... 2-18
MAC Overflow And Saturation ........................................ 2-19
Rounding Mode ................................................................... 2-20
Biased Rounding (ADSP-217x/218x/21msp5x) ............. 2-21
BARREL SHIFTER ........................................................................... 2-22
Shifter Block Diagram Discussion ........................................... 2-22
Shifter Operations ...................................................................... 2-28
Shifter Input/Output Registers ......................................... 2-28
Derive Block Exponent ....................................................... 2-29
Immediate Shifts .................................................................. 2-30
Denormalize ......................................................................... 2-31
Normalize ............................................................................. 2-33
PROGRAM CONTROL
OVERVIEW ........................................................................................ 3-1
PROGRAM SEQUENCER ................................................................ 3-1
Next Address Select Logic .......................................................... 3-3
Program Counter & PC Stack .................................................... 3-4
Loop Counter & Stack ................................................................. 3-4
Loop Comparator & Stack .......................................................... 3-5
PROGRAM CONTROL INSTRUCTIONS ..................................... 3-8
JUMP Instruction ......................................................................... 3-8
Register Indirect JUMPs........................................................ 3-8
CALL Instruction ......................................................................... 3-9
DO UNTIL Loops ........................................................................ 3-9
IDLE Instruction ........................................................................ 3-10
Slow IDLE ............................................................................. 3-10
INTERRUPTS ................................................................................... 3-11
Interrupt Servicing Sequence ................................................... 3-14
Configuring Interrupts.............................................................. 3-14
Interrupt Control Register (ICNTL) .................................. 3-15
Interrupt Mask Register (IMASK) ..................................... 3-16
Global Enable/Disable For Interrupts .............................. 3-17
Interrupt Force & Clear Register (IFC) ............................. 3-18
Interrupt Latency ....................................................................... 3-18
Timer Interrupt Latency (ADSP-2101/2105/2111/2115)3-19