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ARM ARM DUI 0224I manual Dma Kmi, Lcd, Led, Reconfig, VPB//PB926EJ-SB-9, PCI D-2

Models: ARM DUI 0224I

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Index

CLCD

D

K

adaptor connectors C-15

controller 3-61,4-47

DMA

KMI

register

4-32,4-34

mapping registers 4-52

interface

3-74,4-67

Clocks

registers

4-37

architecture

3-35

L

changing

3-43

E

development chip 3-39

LAN91C111

3-69

logic tile

3-52

multiplexor

3-54

Electrical

LCD

peripheral

3-51,3-54

specification

B-2

adaptor board C-2

programmable

3-48

Embedded Logic Analyzer A-38

character display

4-44

RealView Logic Tile F-7

Ethernet

display resolution

4-49

reset register

4-39

controller 3-69

LED

restrictions

B-5

interface

3-68,4-55

user

3-87

test register

4-40

Library

Configuration

F

platform

2-23

boot memory

2-3

Boot Monitor

2-7

M

FPGA

3-18

FPGA

3-17

interfaces 3-94

architecture

JTAG

2-8

configuration

3-18

MBX

logic

3-22

debug signals

A-40

interface

4-68

memory

4-9

reload sequence 3-20

MCI

memory board

E-3

interface

3-75, 4-70

PCI 4-79

G

register 4-31

RECONFIG 3-9

Mechanical

C-19

registers

4-17,4-25

CLCD adaptor

reset

3-22,3-32

GPIO

memory board

E-20

runtime

3-10

interface

4-56

PCI backplane

D-6

switches

2-3,3-7

signals

3-71

VPB//PB926EJ-SB-9

touchscreen C-13

Memory

Trace port

2-10

I

aliasing at reset

3-27

Configure

boot

2-3

Boot Monitor commands 2-15

card

3-76

boot select

4-34

Interrupt

characteristics 4-15

CLCD display

C-6

controllers 4-57

connector

E-13

PCI D-2

handling

4-63

expansion

4-13

RealView ICE

G-1

secondary 4-61

expansion board

E-2

Smart Card

3-82

sources

3-72

flash commands

2-17

USB debug

G-1

flash register 4-32

Conventions

J

interface

3-15

numerical

xxi

map

4-3

signal naming

xxi

MPMC 4-71

timing diagram xx

JTAG

NOR flash

4-12

typographical

xix

configuration

2-8

PCI

4-76

signals

3-98, A-36, D-9

remapping

4-9

support

3-96

SDRAM

4-10

USB debug 2-8

SSMC 4-91

Index-2

Copyright © 2003-2010 ARM Limited. All rights reserved.

ARM DUI 0224I

Image 400

ARM ARM DUI 0224I manual Dma Kmi, Lcd, Led, Reconfig, VPB//PB926EJ-SB-9, PCI D-2

Contents

RealView Platform Baseboard for ARM926EJ-S User Guide RealView Platform Baseboard for ARM926EJ-SCopyright 2003-2010 ARM Limited. All rights reserved Product Status Conformance Notices RealView Platform Baseboard for ARM926EJ-S User Guide Chapter Programmer’s Reference Appendix B Specifications Appendix G Configuring the USB Debug Connection List of Tables Sysmisc VFP9 implementation 100 Xii List of Figures Syssw Sysled Sysbootcs Sysmisc Figure D-4 Jtag signal flow on the PCI backplane Preface Feedback on Using this manual About this manualProduct revision status Intended audience Conventions Typographical Timing diagrams Signals Numbering Further reading ARM publications Xxiii Other publications TFT-LCD Module LQ084V1DG21 Sharp Corporation, Osaka, Japan Feedback on this product FeedbackFeedback on this manual Xxvi Introduction About the PB926EJ-S On page 1-3 shows the layout of the PB926EJ-S PB926EJ-S layout PB926EJ-S architecture Time of year clock with backup battery Field Programmable Gate-Array Fpga that implements System architecture Shows the architecture of the PB926EJ-S 2 ARM926EJ-S PXP Development Chip 3 PB926EJ-S FpgaDisplays RealView Logic Tile expansion Clock generators MemoryDebug and test interfaces Ensuring safety PrecautionsPreventing damage ARM DUI Getting Started Setting up the RealView Platform Setting the configuration switches Boot memory configuration Selecting the boot device Default switch positionsSwitch Default Function in default position S1-2 S1-1 Device LED indicators Lists the PB926EJ-S LED indicators and their functionLED Indicators Color Device Function LED ID Boot Monitor configuration Connecting Jtag debugging equipment Jtag connection USB debug port connection Connecting the Trace Port Analyzer Example of MultiTrace and Jtag connection Example of RealView ICE and RealView Trace About using trace Trace connector and adaptor board Supplying power Power connectors Running the Boot Monitor Using the PB926EJ-S Boot Monitor and platform libraryBoot Monitor commands Boot Monitor commands Lists the commands for the Boot MonitorCommand Action Boot Monitor Configure commands Lists the commands for the Debug subsystemBoot Monitor Debug commands Lists the commands for the NOR Flash subsystem Boot Monitor NOR flash commands Rebuilding the Boot Monitor Boot Monitor NOR flash commands CommandAction Getting Started Loading Boot Monitor into NOR flash For RealView DebuggerFrom the Debug menu → Include Commands Redirecting character output to hardware devices Rebuilding the platform library Building an application with the platform library Loading and running an application from NOR flash Load region in flash Using a boot script to run an image automatically ARM DUI DMA on Fpga onInterrupts on Hardware Description ARM926EJ-S PXP Development Chip 1 ARM926EJ-S PXP Development Chip overview ARM926EJ-S PXP Development Chip block diagram Embedded Trace Macrocell ETM provides signals for off-chip This high-performance, low-power Vector Floating-Point VFPARM926EJ-S CPU is a member of the ARM9 Thumb family. ARM926EJ-S r0p3 macrocell is a 32-bit cached processor with Memory controllers Configuration control Synchronous serial port Configuration switches Configuration from the DEV Chip Reconfig pushbutton Configuration signals from SYSCFGDATAx Restoring the default configuration AHB bridges and the bus matrix Simultaneous access Example of multiple masters AHB map Core APB and DMA APB map Memory interface Memory devices AHB monitor AHB monitor connection Fpga Shows the architecture of the Fpga on the PB926EJ-S Fpga configuration For details on Fpga components, see Fpga image 1 this is the image supplied with the board Localdone Globaldone Hardware Description Reset controller Reset and reconfiguration logic 11 PB926EJ-S reset logic Reset level Default valuesMemory Registers Peripherals 12 Reset signal sequence See -4 on page 3-29 for a description of the reset signals 13 Programmable reset level Memory aliasing at reset NSTATICCS1 if one of BOOTCSSEL10 is not b11 14 Boot memory remap logic Reset signals Describes reset signalsReset signal descriptions Name Function NPBRESET NPBSDCRECONFIGNPLLRESET NPORESET Usbwakeup Reset timing 15 Power-on reset and configuration timing Power supply control 16 Standby switch and power-supply control Clock architecture Clock domains for the PB926EJ-S are shown in Figure Clock domains for the PB926EJ-S are ARM926EJ-S PXP Development Chip Where it can be used as the CPU clock for low-power mode Signal nGLOBALCLKEN from Z50 on the Logic Tile indicates toTiming the Ethernet bus. HCLKM2 typically generated from Controller interface to the Fpga ARM DUI 1 ARM926EJ-S PXP Development Chip clocks 18 ARM926EJ-S PXP Development Chip internal multiplexors Lists the clock signals Default operation XtalclkdrvHCLKM2, HCLKS, PLLCLKEXT, GLOBALCLK, Xtalclkext 19 Default clock sources and frequencies Xtalclkext Example of changing the CPU and bus clock frequencies Operating the AHB bridges in asynchronous mode 20 Clock sources for asynchronous AHB bridges HCLKCTRL70 HCLKM1M2FHCLKM2M2F HCLKSMF2F Default value of HCLKCTRL70 is 0xE0 Hclkctrl signal HCLKM1 driven byHclkctrl signal HCLKM2 driven by HCLKM1 selection Hclkctrl signal Hclks driven by ICS307 programmable clock generatorsHclks selection HCLKSL2S and HCLKSL2F from tile Clcdclkext Selecting the low-frequency clocks in power-saving mode Selecting slow start Peripheral clocks 10 Globalclk selection RealView Logic Tile clocksXTALCLK/GLOBALCLK driven by 22 Example of selecting a tile clock for the AHB S bridge Clock multiplexor logic 23 Clock multiplexors 12 Audio system specification Characteristic ValueAdvanced Audio Codec Interface, Aaci PCM No link Passive microphone on CODECMIC1 and CODECMIC2 13 AC’97 audio debug signals on J45 Pin number Signal name Description Character LCD controller 25 Character display Clcdc interface 26 Display interface Chip Reference Manual for interface details 14 Display interface signals Signal Description DMA 27 DMA channels 15 DMA signals for external devices Ethernet interface USBETHD310USBETHA82 TPO+ , TPO About the Smsc LAN91C111 ARM DUI 29 Gpio block diagram Gpio interface Interrupts 30 External and internal interrupt sources Hardware Description 31 KMI block diagram Keyboard/Mouse Interface, KMI 17 MMC/SD interface signals Signal Widebus mode SD only MMC mode defaultMemory Card Interface, MCI MMC or SD operation Card insertion and removal Card interface description 32 MMI interface 18 MMC signals MCIPWRxCARDINx MCIxDAT30 PCI interface 33 PCI bridge 20 Serial bus signals Serial bus interface19 Serial bus addresses Slave address Slave device Bit Sbscl Smart Card interface, SCI 35 SCI block diagram SCIDATAIN0, SCICLKIN0, and SCIDETECT0 signals. SCICLKINxNSCICLKENx SCICLKOUTx 36 SSP block diagram Synchronous Serial Port, SSP 22 SSP signal descriptions Name Description ARM DUI User switches and LEDs 37 Switch and LED interface Uart interface 38 UARTs block diagram NDRVINEN0 SERxTXDSERxRTS SERxDTR a 23 Serial interface signal assignment 41 OTG243 block diagram USB interface 24 USB interface signal assignment Signal name Direction Description Test, configuration, and debug interfaces 42 Test and debug connectors, links, and LEDs Jtag debug normal mode Jtag and USB debug port support Jtag configuration mode 25 Jtag related signals Jtag signalsName Description Function 25 Jtag related signals Name Description Function RtckReturn TCK NCFGEN Dbgack NRTCKEN 43 Jtag connector signals 44 Jtag signal routing 45 RealView Logic Tile Jtag circuitry ChipScope integrated logic analyzer Embedded trace support Ethernet on MBX on Timers on Uart on Sdram Memory map4KB Memory map Peripheral Location Interrupt a PIC Address Region SIC Size Vectored Interrupt Controller PIC PIC Uart 0 Interface Dev. chip PIC 2GB PCISIC ARM Data bus memory map Configuration and initialization Remapping of boot memory Switch is ON, the corresponding Bootcssel signal is High Removing boot remapping and enabling Sdram atEnable Sdram at Simplified version of the remap logic is shown in -14 on Programmer’s Reference Booting from NOR flash Booting from NOR flash Booting from static expansion memory Booting from static expansion memory Booting from AHB expansion memory Booting from AHB expansion Memory characteristics Memory banks Status and system control registers Name Address Accessa Reset Description Level Register map for system control registers Applycfgword active Switch Register, Syssw ID Register, Sysid bit assignment Bits Access DescriptionID Register, Sysid Describes the PB926EJ-S ID Register assignment LED Register, Sysled Sysled Oscillator registers, SYSOSCx Shows the bit assignment of the registers Lock Register, Syslock Describes the PB926EJ-S Lock Register bit assignment Configuration registers SYSCFGDATAx 6 100Hz Counter, SYS100HZ Configuration register Bits Power-on Description Reset state High CFGHCLKEXTDIVSEL20, clock control PLL feedback see ARM926EJ-S PXP Development Chip clocks on HIGH, then expansion memory is aliased to Register name Address Access Reset by Description Flag registers, SYSFLAGx and SYSNVFLAGxFlag and Nonvolatile Flag Registers Flag and Nonvolatile Flag Set Registers Reset Control Register, Sysresetctl 11 Reset level controlBits Access Description PCI Control Register, Syspcictl Flash Control Register, Sysflash Clcd Control Register, Sysclcd12 MCI control 13 Flash control 14 Sysclcd 14 Sysclcd register 14 2.2 inch LCD Control Register Sysclcdser Boot Select Register, Sysbootcs15 Sysclcdser register 16 Sysbootcs 16 Boot configuration switches Miscellaneous System Control Register, Sysmisc 16 24MHz Counter, SYS24MHZPnINTA LOW DMA peripheral map registers, SYSDMAPSRx Name Address Access DescriptionSYS DMAPSR1 = USB a Oscillator reset registers, SYSOSCRESETx 19 shows the bit assignment of the registers 20 Oscillator test registers Name Address Access Description Oscillator test registers, SYSTESTOSCx AHB monitor 21 AHB monitor implementationProperty Value DMA PrimeCell Modifications 22 Aaci implementation Bit Access Description 23 Modified Aaci PeriphID3 register Character LCD display 24 Character LCD display implementation Charcom ChardatCharrd Charmask 26 Character LCD display commands An overview of the commands available is listed in TableCommand Bit Description Pattern Color LCD Controller, Clcdc 27 Clcdc implementation Display resolutions and display memory organization 28 PrimeCell Clcdc register differencesChip VGA Svga 800x600 on Svga 36MHz, 0x2CAC Epson 2.2in panel Qcif 10MHz, 0x2C2ASanyo 3.8in panel Qvga 10MHz, 0x2C2A 320x240 ARM DUI CLD23 CLD22CLD21 CLD20 Direct Memory Access Controller and mapping registers 32 Dmac implementation 33 shows the DMA channel allocation 33 DMA channels DMA Requester 21 SYSDMAP0-2 mapping register format 34 DMA mapping register format Ethernet 35 Ethernet implementation 36 Gpio implementation General Purpose Input/Output, GpioGpio Interrupt controllers 37 VIC Primary Interrupt Controller implementation38 SIC implementation Fpga 38 SIC implementation PropertyValue Primary interrupt controllerDmana 40 Interrupt signals to primary interrupt controller Bit Interrupt source a DescriptionVICINTSOURCE31 External interrupt from secondary controller GND MBXPwrfail Clcd Secondary interrupt controller 42 Interrupt signals to secondary interrupt controller Bit Interrupt Description Source Handling interrupts Example 4-1 Clearing and re-enabling SCI0 card out interrupt Example 4-2 Pseudo code for SIC SCI1 card out interrupt Example 4-3 Clearing and re-enabling SCI1 card out interrupt SCI1IMSC SCI1CARDOUTIM 43 KMI implementation Keyboard and Mouse Interface, KMIKMI 13 MBX 44 MBX implementation Move video coprocessor MultiMedia Card Interfaces, MCIx 45 MCI implementation Register values MultiPort Memory Controller, Mpmc46 Mpmc implementation 47 Sdram register values Address Register name Value Description OffsetMpmcclkout runs SDRAM32M16BRCX32 +0x144 MPMCDynamicRasCas2 48 PCI controller implementation PCI controllerDmac Address Name Access Description Control registers Map register formats are shown in -25 and -54 on PCIIMAPx registers50 PCI controller registers Pciselfid register Pciflags registerBits Description 52 Pciselfid register format PCISMAPx registers Map register format is shown in -29 and Table PCI configuration54 PCISMAPx register format Locating the self-config header table 57 PCI configuration space header Address Configuration word function Default Offset Value Configuring the PCI interface Limitations of the PCI interface Interrupt Acknowledge Ignored Not available Real Time Clock, RTC 59 RTC implementation 60 Serial bus implementation Property Value SbcontrolSbcontrols Sbcontrolc Dynamic expansion E2PROM 63 SCI implementation ARM PrimeCell Synchronous Serial Port Controller PL022 Register, Sysclcd on Synchronous Static Memory Controller, Ssmc 65 Ssmc implementation 67 Register values for Intel flash, async page mode Address Name of Ssmc Value Description Register 68 Register values for Samsung Sram SMBWSTOENR4 SMBWSTWENR4SMBCR4 SMBWSTBRDR4 System Controller See also Status and system control registers on Timers 72 Timer implementation Uart 73 Uart implementation PrimeCell Modifications 74 USB implementation Address Description Vector Floating Point, VFP9 76 VFP9 implementation Watchdog 77 Watchdog implementation 102 Signal Descriptions Signals associated with the SSP are shown in Table A-1 Table A-1 SSP signal assignmentSignal name Description Synchronous Serial Port interface Pin Signal Description Smart Card interface Table A-3 Signals on expansion connector Signal Pin Signal name Table A-4 Serial plug signal assignment PB926EJ-S provides four serial transceiversTop Bottom SER1DTR a SER2DTR a SER3DTR a Figure A-5 shows the USB connectors Figure A-6 Audio connectors Audio Codec interface MMC and SD flash card interface Figure A-7 MMC/SD card socket pin numbering Table A-5 lists the signal assignments Table A-6 Clcd Interface board connector J18 Pin Signal Clcd display interfaceClle GND Clac Clcp Cllp Clfp LCDID0 Clpower PWR3V5VSWITCH Vlcd Vddposswitch VddnegswitchLCDID2 Tsmiso LCDID3 Tsmosi LCDID4 Lcdxwr GND LCDSD0 Lcdxrd Lcdxcs Figure A-9 Clcd Interface connector J18 Table A-7 VGA connector signals Pin Description VGA display interface Figure A-11 Gpio connector Each data pin has an on-board 10KΩ pullup resistor to Keyboard KMI0, J24 Mouse KMI1, J23 Pin Signal Function Table A-8 Mouse and keyboard port signal descriptionsKeyboard and mouse interface Table A-9 Ethernet signals Pin Signal Signals on the Ethernet cable are shown in Table A-9Pin RealView Logic Tile header connectors Figure A-14 HDRX, HDRY, and Hdrz upper pin numbering Hdrx signals Table A-10 Hdrx J9 signals Platform signal Tile Pin Signal Table A-10 Hdrx J9 signals Platform signal Tile Pin Signal Smcancelwait HBUSREQM2HCLKM1DRVL2S HWRITEM2 HDATAM27 HDATAM28HDATAM29 HDATAM210 Hdry signals Table A-11 Hdry J12 signals Platform signal Tile signal Pin Signal HRESPS0 HreadysHmastlocks Hsels HDATAS5 LtclcpHDATAS6 Ltclle Platform signal Tile signal Pin Table A-12 Hdrz J8 signalsHdrz EXPSMADDR15 EXPSMADDR16EXPSMADDR17 EXPSMADDR18 Table A-12 Hdrz J8 signals Platform signal Tile signal Pin Ctdi BOOTCSSEL7 Fpgaimage ClknegdninHCLKM1RESF2L Clkposupout Dtdoin Dtdoout HCLKSRESF2L Clknegupout EXPSMDATAS1 EXPSMDATAS2EXPSMDATAS3 EXPSMDATAS4 EXPSMDATAS26 HBURSTM10EXPSMDATAS27 HPROTM13 HADDRM119 HDATAM112HADDRM120 HDATAM111 Figure A-15 Test points and debug connectors Test and debug connections Test point Signal Function This section contains the following subsectionsJtag on page A-36 Overview of test points SCIDATAOUTTDD0 IntclkREFCLK1 SPARE2 Jtag USB debug port Trace connector pinout Table A-14 Trace connector J14 Channel Pin Figure A-18 Embedded logic analyzer connector J33 Figure A-19 AMP Mictor connector Table A-15 AHB monitor connector J17 Channel Pin Fpga debug connector pinout Table A-16 Fpga debug connector J39 Channel Pin Specifications Bus interface characteristics Electrical specificationTable B-1 shows the PB926EJ-S electrical characteristics Powered from DC Powered from J34 or PCI busCurrent requirements Table B-2 Current requirements from DC System Typical Max Loading on supply voltage rails Default clock rates for reliable operation are Clock rate restrictions HRESETn input AHB bus timingHwrite , HTRANS10 , HSIZE20 , HBURST20 , HTRANS10 , HSIZE20 , HBURST20 , and write data Memory timing Peripheral timing Scirefclk ClcdclkSspclk Mechanical details Figure B-1 shows the mechanical outline of the PB926EJ-S ARM DUI Connectors on page C-15 Clcd Display and Adaptor Board Figure C-1 Clcd adaptor board connectors bottom view About the Clcd display and adaptor board Figure C-2 Small Clcd enclosure Figure C-3 Large Clcd enclosure Clcd Display and Adaptor Board Installing the Clcd display Figure C-5 Clcd adaptor board connection Configuration LCD power controlTDK CXA-L0612VJL Switchedvddneg Switchedvddneg Switchedfixed Clpower SwitchedvddposFixedswitch Invio Figure C-6 Clcd buffer and power supply control links Touchscreen controller interface Touchscreen interface architectureVBAT21 AUX21 Touch Example C-1 SSP to Tsci interface setup SSP and Tsci ConfigurationTouchscreen controller programmer’s interface Example C-2 Configuring and reading the Tsci interface Interface connector ConnectorsTable C-4 Clcd interface connector J2 Pin Signal LCD prototyping connector Table C-5 LCD prototyping connector J1 Signal Pin Touchscreen prototyping connector Inverter prototyping connector Table C-8 A/D and keypad J13 Signal Pin 5 A/D and keypad connectorAUX1 GND AUX2 VBAT1 VBAT2 Mechanical layout Figure C-9 Clcd adaptor board mechanical layout ARM DUI PCI Backplane and Enclosure Connecting the PB926EJ-S to the PCI enclosure PCI Backplane and Enclosure Setting the backplane configuration switches A socket, the socket is bypassed by an automatic switch Connecting two PB926EJ-S boards Figure D-2 Multiple boards on PCI bus Backplane hardware Figure D-3 PCI backplane Table D-1 LED indicators CLK33ACTIVECLK66ACTIVE CLK133ACTIVE Table D-2 Configuration switches Switch Signal DescriptionTable D-3 Power and reset switches Test point Signal Description Figure D-4 Jtag signal flow on the PCI backplane Power connector Table D-5 ATX power connector Signal Pin3V3 12V NPSON Table D-6 Mictor connector pinout Logic analyzer connectorChannel Pin Jtag connector Signals on the Jtag connector J5 are shown in Figure D-6Table D-6 Mictor connector pinout Channel Pin SPARE4 Memory Expansion Boards Figure E-1 Dynamic memory board block diagram About memory expansion Memory board configuration Operation without expansion memory Table E-1 Memory width encoding Memory width selection on the static memory boardWidth Figure E-3 Memory board installation locations Fitting a memory board Eeprom contents Table E-2 Chip Select information block Function Address Value Offset Address Contents Offset Figure E-4 Chip select information block EXPnCS memory device string CS6 access time in 0.1ps LSB Address Contents Example contents DYCS3 memory size in bytes Connector pinout Expansion connector DATA0 DATA1DATA2 DATA3 ADDR1 ADDR0ADDR2 ADDR3 ADDR4 ADDR5 ADDR6 ADDR7 ADDR8 ADDR9 Table E-6 Static memory connector signals Pin No SignalNRAS NCAS Table E-6 Static memory connector signals Pin No Signal Vddio a ADDR2 NCS4NCS3 NCS2 ADDR15 NCS0 ADDR16 ADDR17NIRQ ADDR18 Figure E-6 Dynamic memory board layout RealView Logic Tile About the RealView Logic Tile Fitting a RealView Logic Tile Figure F-2 RealView Logic Tile fitted on PB926EJ-S Header connectors Variable I/O levels Figure F-3 HDRX, HDRY, and Hdrz upper pin numbering RealView Logic Tile I/O Figure F-4 RealView Logic Tile tristate for I/O RealView Logic Tile clocks Table F-1 RealView Logic Tile clock signals RealView Logic Tile ARM AHB buses used by the Fpga and RealView Logic Tiles AHB M1 AHB S Example RealView Logic Tile implementation Figure F-6 Bus signals for RealView Logic Tile and Fpga Reset DnTRST pulse Configuring the USB Debug Connection Installing the RealView ICE Micro Edition driver Installing the RealView Developer Suite Installing the RealView ICE Micro Edition driver on Windows Select Specify a location Configuring the USB Debug Connection Changes to RealView Debugger Figure G-1 Nodes added to Connection Control window Using the USB debug port to connect RealView Debugger Figure G-2 The Connection Control window Figure G-3 ARM926EJ-S PXP Development Chip detected Figure G-5 Error shown when no devices are detected Configuring the USB Debug Connection Using the Debug tab of the RealView Debugger Register pane There are three groups of settings Global Properties FalseTrue Jtagclocktype Device Properties Semihosting Properties ARM DUI Uart Aaci AHBJtag MCI Reconfig DMA KMILCD LED SYS Resetctl TCMMove Uart SCI SSP Uart Xtalclkdrv