NXP Semiconductors PXN2020 - 10.7.3 eDMA Dynamic Interrupt Priority Elevation

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Interrupts and Interrupt Controller (INTC)

PXN20 Microcontroller Reference Manual, Rev. 1

Freescale Semiconductor 10-49

Great care must be taken when using the priority elevation as it can enable a master to starve the rest of

the masters in the system. For more information, see Chapter 19, Error Correction Status Module (ECSM).

10.7.3 eDMA Dynamic Interrupt Priority Elevation

The eDMA can handle dynamic priority elevation via the Bandwidth Control (BWC) field of the transfer

control descriptor (TCD). For more information, see Section 24.3.2.17, Transfer Control Descriptor

(TCD). The PXN20 DMA multiplexing source allocation is shown in Table 23-4.

Main Page

PXN20 Microcontroller Reference Manual1
About This Book33
Suggested Reading35
Chapter 1 Introduction43
- 1.1 Overview43
- 1.2 PXN20 Features43
- 1.3 PXN20 Block Diagram45
- 1.4 PXN21 Block Diagram46
- 1.5 Critical Performance Parameters47
  - 1.5.1 Low Power Operation47
- 1.6 Packages48
- 1.7 Module Features48
- 1.8 Developer Support63
Chapter 2 Memory Map65
- 2.1 Introduction65
Chapter 3 Signal Description69
- 3.1 Introduction69
- 3.2 Signal Properties Summary69
  - 3.2.1 I/O Power and Ground Segmentation86
- 3.3 Pinout87
- 3.4 Detailed Signal Description89
Chapter 4 Resets113
- 4.1 Introduction113
- 4.2 External Signal Description113
  - 4.2.1 Reset (RESET)114
  - 4.2.2 Boot Configuration (BOOTCFG)114
- 4.3 Functional Description114
  - 4.3.1 Z6, Z0 Cores Reset Vectors114
  - 4.3.2 Reset Sources114
- 4.4 Reset Configuration116
  - 4.4.1 Reset Configuration Timing117
Chapter 5 System Clock Description119
- 5.1 Introduction119
- 5.2 System Clock Architecture124
- 5.3 Clock Dividers126
- 5.4 Software-Controlled Power Management128
- 5.5 Alternate Module Clock Domains130
Chapter 6 Clocks, Reset, and Power (CRP)133
- 6.1 Introduction133
- 6.2 Memory Map and Registers136
  - 6.2.1 Module Memory Map136
  - 6.2.2 Register Descriptions137
- 6.3 Functional Description149
- 6.4 Real-Time Counter (RTC)157
- 6.5 Power Supply Monitors161
  - 6.5.1 Power-On Reset (POR)161
  - 6.5.2 Low-Voltage Monitors (LVI)161
Chapter 7 Frequency Modulated Phase-Locked Loop (FMPLL)163
- 7.1 Introduction163
- 7.2 External Signal Description164
- 7.3 Memory Map and Registers164
  - 7.3.1 Module Memory Map164
  - 7.3.2 Register Descriptions165
- 7.4 Functional Description172
- 7.5 Resets180
- 7.6 Interrupts181
  - 7.6.1 Loss-of-Lock Interrupt Request181
  - 7.6.2 Loss-of-Clock Interrupt Request181
Chapter 8 System Integration Unit (SIU)183
- 8.1 Introduction183
- 8.2 External Signal Description185
  - 8.2.1 Ports vs. General-Purpose I/O Pins186
- 8.3 Memory Map and Registers186
  - 8.3.1 Module Memory Map186
  - 8.3.2 Register Descriptions195
- 8.4 Functional Description250
Chapter 9 Boot Assist Module (BAM)255
- 9.1 Introduction255
  - 9.1.1 Features255
  - 9.1.2 Modes of Operation256
- 9.2 Memory Map and Registers256
  - 9.2.1 Module Memory Map256
  - 9.2.2 Register Descriptions257
- 9.3 Functional Description257
Chapter 10 Interrupts and Interrupt Controller (INTC)269
- 10.1 Introduction269
- 10.2 External Signal Description275
- 10.3 Memory Map and Registers276
  - 10.3.1 INTC Memory Map276
  - 10.3.2 Register Descriptions277
- 10.4 Functional Description287
- 10.5 Initialization/Application Information306
- 10.6 Non-Maskable Interrupt (NMI)315
- 10.7 Dynamic Interrupt Priority Elevation316
Chapter 11 General-Purpose Static RAM (SRAM)319
- 11.1 Introduction319
- 11.2 External Signal Description321
- 11.3 Memory Map and Registers321
- 11.4 Functional Description321
- 11.5 SRAM ECC Mechanism321
  - 11.5.1 Access Timing322
  - 11.5.2 Reset Operation323
- 11.6 DMA Requests324
- 11.7 Interrupt Requests324
- 11.8 Initialization and Application Information324
  - 11.8.1 Example Code324
Chapter 12 Flash Memory Array and Control327
- 12.1 Introduction327
- 12.2 External Signal Description330
- 12.3 Memory Map and Registers330
  - 12.3.1 Module Memory Map330
  - 12.3.2 Register Descriptions332
- 12.4 Functional Description353
Chapter 13 e200z6 Core (Z6)365
- 13.1 Introduction365
- 13.2 Core Registers and Programmer’s Model370
- 13.3 Functional Description378
- 13.4 Power Architecture Instruction Extensions - VLE397
- 13.5 External References398
Chapter 14 e200z0 Core (Z0)399
- 14.1 Introduction399
  - 14.1.1 Features399
- 14.2 Microarchitecture Summary400
- 14.3 Core Registers and Programmer’s Model403
- 14.4 Interrupt Types409
- 14.5 Bus Interface Unit (BIU)411
Chapter 15 Semaphores413
- 15.1 Introduction413
- 15.2 Signal Description415
- 15.3 Memory Map and Registers415
  - 15.3.1 Module Memory Map415
  - 15.3.2 Register Descriptions416
- 15.4 Functional Description422
  - 15.4.1 Semaphore Usage424
- 15.5 Initialization Information424
- 15.6 Application Information424
- 15.7 DMA Requests426
- 15.8 Interrupt Requests426
Chapter 16 AMBA Crossbar Switch (AXBS)427
- 16.1 Introduction427
- 16.2 Memory Map and Register Definition429
  - 16.2.1 Register Descriptions430
- 16.3 Functional Description434
Chapter 17 Peripheral Bridge (AIPS-lite)439
- 17.1 Introduction439
- 17.2 External Signal Description440
- 17.3 Memory Map and Register Description440
- 17.4 Functional Description440
  - 17.4.1 Read Cycles440
  - 17.4.2 Write Cycles440
Chapter 18 Memory Protection Unit (MPU)441
- 18.1 Introduction441
- 18.2 Signal Description443
- 18.3 Memory Map and Registers443
  - 18.3.1 Module Memory Map443
  - 18.3.2 Register Descriptions445
- 18.4 Functional Description455
  - 18.4.1 Access Evaluation Macro455
    - 18.4.1.1 Access Evaluation-Hit Determination456
    - 18.4.1.2 Access Evaluation-Privilege Violation Determination456
  - 18.4.2 Putting It All Together and AHB Error Terminations457
- 18.5 Initialization Information457
- 18.6 Application Information458
Chapter 19 Error Correction Status Module (ECSM)461
- 19.1 Introduction461
  - 19.1.1 Features461
- 19.2 Memory Map and Registers461
  - 19.2.1 Module Memory Map462
  - 19.2.2 Register Descriptions463
Chapter 20 Software Watchdog Timer (SWT)479
- 20.1 Introduction479
  - 20.1.1 Features479
  - 20.1.2 Modes of Operation479
- 20.2 External Signal Description479
- 20.3 Memory Map and Register Definition480
  - 20.3.1 Memory Map480
  - 20.3.2 Register Descriptions480
- 20.4 Functional Description485
Chapter 21 System Timer Module (STM)489
- 21.1 Overview489
- 21.2 External Signal Description489
- 21.3 Memory Map and Register Definition490
  - 21.3.1 Memory Map490
  - 21.3.2 Register Descriptions490
- 21.4 Functional Description493
Chapter 22 Periodic Interrupt Timer (PIT)495
- 22.1 Introduction495
- 22.2 Signal Description496
  - 22.2.1 External Signal Description496
- 22.3 Memory Map and Registers496
  - 22.3.1 Module Memory Map496
  - 22.3.2 Register Descriptions498
- 22.4 Functional Description502
- 22.5 Initialization and Application Information503
  - 22.5.1 Example Configuration503
Chapter 23 DMA Channel Multiplexer (DMA_MUX)505
- 23.1 Introduction505
- 23.2 External Signal Description506
- 23.3 Memory Map and Registers506
  - 23.3.1 Module Memory Map506
  - 23.3.2 Register Descriptions508
    - 23.3.2.1 Channel Configuration Registers (CHCONFIGx)508
- 23.4 Functional Description512
- 23.5 Initialization/Application Information516
  - 23.5.1 Reset516
  - 23.5.2 Enabling and Configuring Sources516
- 23.6 Interrupts520
Chapter 24 Enhanced Direct Memory Access Controller (eDMA)521
- 24.1 Introduction521
- 24.2 External Signal Description523
- 24.3 Memory Map and Registers523
  - 24.3.1 Module Memory Map523
  - 24.3.2 Register Descriptions527
- 24.4 Functional Description549
  - 24.4.1 eDMA Basic Data Flow551
- 24.5 Initialization / Application Information554
Chapter 25 Fast Ethernet Controller (FEC)567
- 25.1 Introduction567
- 25.2 Modes of Operation570
- 25.3 Programming Model571
- 25.4 Functional Description595
- 25.5 Buffer Descriptors609
Chapter 26 FlexRay Communication Controller (FlexRAY)615
- 26.1 Introduction615
- 26.2 External Signal Description620
  - 26.2.1 Detailed Signal Descriptions620
- 26.3 Controller Host Interface Clocking621
- 26.4 Protocol Engine Clocking622
  - 26.4.1 Oscillator Clocking622
  - 26.4.2 PLL Clocking622
- 26.5 Memory Map and Register Description622
  - 26.5.1 Memory Map622
  - 26.5.2 Register Descriptions625
- 26.6 Functional Description692
- 26.7 Application Information766
Chapter 27 Media Local Bus (MLB)773
- 27.1 Introduction773
- 27.2 External Signal Description775
- 27.3 Memory Map and Register Description776
  - 27.3.1 Memory Map776
  - 27.3.2 Register Descriptions780
- 27.4 Functional Description798
- 27.5 Initialization Information811
Chapter 28 Enhanced Modular Input/Output Subsystem (eMIOS200)823
- 28.1 Introduction823
- 28.2 External Signal Description828
  - 28.2.1 eMIOS[n]828
  - 28.2.2 Output Disable Input - eMIOS200 Output Disable Input Signal828
- 28.3 Memory Map and Register Description828
  - 28.3.1 Memory Map828
  - 28.3.2 Register Descriptions830
- 28.4 Functional Description842
- 28.5 Reset881
- 28.6 Interrupts881
- 28.7 DMA Requests881
- 28.8 Initialization/Application Information882
Chapter 29 Controller Area Network (FlexCAN)885
- 29.1 Introduction885
- 29.2 External Signal Description888
- 29.3 Memory Map and Registers888
- 29.4 Functional Description911
- 29.5 Initialization and Application Information924
  - 29.5.1 FlexCAN Initialization Sequence924
Chapter 30 Deserial - Serial Peripheral Interface (DSPI)927
- 30.1 Introduction927
- 30.2 External Signal Description931
- 30.3 Memory Map and Registers931
  - 30.3.1 Module Memory Map931
  - 30.3.2 Register Descriptions933
- 30.4 Functional Description954
- 30.5 Initialization/Application Information985
Chapter 31 Enhanced Serial Communication Interface (eSCI)991
- 31.1 Introduction991
- 31.2 External Signal Description994
- 31.3 Memory Map and Registers994
  - 31.3.1 Memory Map994
  - 31.3.2 Register Descriptions995
- 31.4 Functional Description1010
- 31.5 Application Information1042
  - 31.5.1 SCI Data Frames Separated by Preamble1042
Chapter 32 Inter-Integrated Circuit Bus Controller Module (I2C)1045
- 32.1 Introduction1045
- 32.2 External Signal Description1048
- 32.3 Memory Map and Registers1048
  - 32.3.1 Module Memory Map1048
  - 32.3.2 Register Descriptions1049
- 32.4 Functional Description1055
  - 32.4.1 I-Bus Protocol1055
  - 32.4.2 Interrupts1059
    - 32.4.2.1 General1059
    - 32.4.2.2 Interrupt Description1059
- 32.5 Initialization/Application Information1060
  - 32.5.1 I2C Programming Examples1060
  - 32.5.2 DMA Application Information1064
Chapter 33 Cross Triggering Unit (CTU)1069
- 33.1 Introduction1069
- 33.2 Main Features1069
- 33.3 Block Diagram1069
- 33.4 Memory Map and Register Description1070
  - 33.4.1 Module Memory Map1070
- 33.5 Functional Description1075
Chapter 34 Analog-to-Digital Converter (ADC)1081
- 34.1 Introduction1081
  - 34.1.1 Block Diagram1081
  - 34.1.2 Features1082
- 34.2 External Signals1082
- 34.3 Memory Map and Register Definition1083
  - 34.3.1 ADC Memory Map1083
  - 34.3.2 ADC Register Descriptions1088
- 34.4 Functional Description1121
Chapter 35 IEEE 1149.1 Test Access Port Controller (JTAGC)1135
- 35.1 Introduction1135
- 35.2 External Signal Description1139
- 35.3 Memory Map and Registers1139
- 35.4 Functional Description1140
- 35.5 e200z0 and e200z6 OnCE Controllers1146
- 35.6 Initialization/Application Information1149
Chapter 36 Nexus Development Interface (NDI)1151
- 36.1 Introduction1151
- 36.2 Block Diagram1151
  - 36.2.1 NDI Features1153
  - 36.2.2 Modes of Operation1155
- 36.3 External Signal Description1156
- 36.4 Memory Map and Registers1157
  - 36.4.1 NDI Functional Description1159
- 36.5 Nexus Port Controller (NPC)1163
- 36.6 e200z6 Class 3 Nexus Module (Nexus3+)1174
- 36.7 e200z0 Class 2+ Nexus Module (Nexus2+)1220
- 36.8 Debug Implementation1252
- 36.9 Debug Capabilities1252
- 36.10 Debug Port1254
  - 36.10.1 Nexus2+/3 Auxiliary Port1255
- 36.11 Debug Methods1256
  - 36.11.1 208 MAPBGA Package Debug Method1256
  - 36.11.2 256 MAPBGA Package Debug Method1256
Appendix A Memory Map1259

NXP Semiconductors PXN2020 - 10.7.3 eDMA Dynamic Interrupt Priority Elevation

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