Lucent Technologies DSP1617 Information Manual page 53

3 Software Architecture ...................................................................................................................................3-1
3.1 Register View of the DSP1611/17/18/27/28/29 .................................................................................3-1
3.1.1 Types of Registers ..............................................................................................................3-1
3.1.2 Register Length Definition ..................................................................................................3-5
3.1.3 Register Reset Values ........................................................................................................3-6
3.1.4 Flags ...................................................................................................................................3-7
3.2 Memory Space and Addressing.........................................................................................................3-8
3.2.1 Y-Memory Space ................................................................................................................3-8
3.2.2 X-Memory Space ..............................................................................................................3-10
3.3 Arithmetic and Precision ..................................................................................................................3-21
3.4 Interrupts..........................................................................................................................................3-27
3.4.1 Introduction .......................................................................................................................3-27
3.4.2 Interrupt Sources ..............................................................................................................3-29
3.4.3 Outputs of Interrupts .........................................................................................................3-31
3.4.4 Interrupt Operation ............................................................................................................3-32
3.4.5 Trap Description ................................................................................................................3-38
3.4.6 Powerdown with the AWAIT State .....................................................................................3-40
3.4.7 Interrupts in DSP16A-Compatible Mode (DSP1617 Only) ................................................3-42
3.4.8 Timing Examples, DSP16A-Compatible Mode (DSP1617 Only) ......................................3-44
3.5 Clock Synthesis (DSP1627, DSP1628, and DSP1629 Only) ..........................................................3-47
3.5.1 PLL Control Signals ..........................................................................................................3-48
3.5.2 PLL Programming Examples ............................................................................................3-50
3.5.3 Latency .............................................................................................................................3-50
3.6 Power Management .........................................................................................................................3-52
3.6.1 powerc Control Register Bits ...........................................................................................3-52
3.6.2 STOP Pin ..........................................................................................................................3-56
The pllc Register Bits (DSP1627/28/29 Only) ..................................................................3-56
3.6.3
3.6.4 AWAIT Bit of the alf Register ............................................................................................3-56
3.6.5 Power Management Sequencing ......................................................................................3-57
3.6.6 Power Management Examples .........................................................................................3-58
CHAPTER 3. SOFTWARE ARCHITECTURE
CONTENTS