DSi I/O Map Contents
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DSi Memory Map
The overall memory map is same as on NDS. New/changed areas are:
  0000000h  64Kbyte ARM7 BIOS   (unlike NDS which had only 16KB)
  2000000h  16MByte Main RAM    (unlike NDS which had only 4MB)
  3000000h  800Kbyte Shared RAM (unlike NDS which had only 32KB)
  4004000h  New DSi I/O Ports
  8000000h  Fake GBA Slot (32MB+64KB) (FFh-filled; when mapped to current CPU)
  C000000h  Mirror of 16Mbyte Main RAM
  D000000h  Open Bus? in retail version, Extra 16Mbyte MainRAM in debug version
  FFFF000h  64Kbyte ARM9 BIOS   (unlike NDS which had only 4KB)

DSi I/O Maps
The overall DSi I/O Maps are same as on NDS,
DS I/O Maps
additional new/changed registers are:

ARM9 NDS Register that are changed in DSi mode
  4000004h 2   DISPSTAT (new Bit6, LCD Initialization Ready Flag)
  4000204h 2   EXMEMCNT (removed Bit0-7, ie. the GBA-slot related bits)
  4000210h 4   IE       (new interrupt sources, removed GBA-slot IRQ)
  4000214h 4   IF       (new interrupt sources, removed GBA-slot IRQ)
  40021A0h 4   Unknown, nonzero, probably same/silimar as on DSi7 side
  40021A4h 4   Unknown, zero, probably same/silimar as on DSi7 side
  40021A8h ..
  40021Bxh ..
  4102010h 4
ARM9 DSi System Control
  4004000h 2   SCFG_A9ROM DSi - NDS9 - ROM Status (R) [0000h]
  4004004h 2   SCFG_CLK   DSi - NDS9 - New Block Clock Control (R/W)
  4004006h 2   SCFG_RST   DSi - NDS9 - New Block Reset (R/W)
  4004008h 4   SCFG_EXT9  DSi - NDS9 - Extended Features (R/W)
  4004010h 2   SCFG_MC    Memory Card Interface Status (16bit) (undocumented)
ARM9 DSi New Shared WRAM Bank Control
  4004040h 4   MBK1       WRAM-A Slots for Bank 0,1,2,3  ;\Global ARM7+ARM9
  4004044h 4   MBK2       WRAM-B Slots for Bank 0,1,2,3  ; Slot Mapping
  4004048h 4   MBK3       WRAM-B Slots for Bank 4,5,6,7  ; (R or R/W, depending
  400404Ch 4   MBK4       WRAM-C Slots for Bank 0,1,2,3  ; on MBK9 setting)
  4004050h 4   MBK5       WRAM-C Slots for Bank 4,5,6,7  ;/
  4004054h 4   MBK6       WRAM-A Address Range           ;\Local ARM9 Side
  4004058h 4   MBK7       WRAM-B Address Range           ; (R/W)
  400405Ch 4   MBK8       WRAM-C Address Range           ;/
  4004060h 4   MBK9       WRAM-A/B/C Slot Write Protect (R)
ARM9 DSi New DMA (NDMA)
  4004100h 4   NDMAGCNT   NewDMA Global Control                     ;-Control
  4004104h 4   NDMA0SAD   NewDMA0 Source Address                    ;\
  4004108h 4   NDMA0DAD   NewDMA0 Destination Address               ;
  400410Ch 4   NDMA0TCNT  NewDMA0 Total Length for Repeats          ; NewDMA0
  4004110h 4   NDMA0WCNT  NewDMA0 Logical Block Size                ;
  4004114h 4   NDMA0BCNT  NewDMA0 Block Transfer Timing/Interval    ;
  4004118h 4   NDMA0FDATA NewDMA0 Fill Data                         ;
  400411Ch 4   NDMA0CNT   NewDMA0 Control                           ;/
  4004120h 4   NDMA1SAD                                             ;\
  4004124h 4   NDMA1DAD                                             ;
  4004128h 4   NDMA1TCNT                                            ; NewDMA1
  400412Ch 4   NDMA1WCNT                                            ;
  4004130h 4   NDMA1BCNT                                            ;
  4004134h 4   NDMA1FDATA                                           ;
  4004138h 4   NDMA1CNT                                             ;/
  400413Ch 4   NDMA2SAD                                             ;\
  4004140h 4   NDMA2DAD                                             ;
  4004144h 4   NDMA2TCNT                                            ; NewDMA2
  4004148h 4   NDMA2WCNT                                            ;
  400414Ch 4   NDMA2BCNT                                            ;
  4004150h 4   NDMA2FDATA                                           ;
  4004154h 4   NDMA2CNT                                             ;/
  4004158h 4   NDMA3SAD                                             ;\
  400415Ch 4   NDMA3DAD                                             ;
  4004160h 4   NDMA3TCNT                                            ; NewDMA3
  4004164h 4   NDMA3WCNT                                            ;
  4004168h 4   NDMA3BCNT                                            ;
  400416Ch 4   NDMA3FDATA                                           ;
  4004170h 4   NDMA3CNT                                             ;/
ARM9 DSi Camera Module
  4004200h 2   CAM_MCNT   Camera Module Control (16bit)
  4004202h 2   CAM_CNT    Camera Control (16bit)
  4004204h 4   CAM_DAT    Camera Data (32bit)
  4004210h 4   CAM_SOFS   Camera Trimming Starting Position Setting (32bit)
  4004214h 4   CAM_EOFS   Camera Trimming Ending Position Setting (32bit)
ARM9 DSi DSP - XpertTeak processor
  4004300h 2   DSP_PDATA  DSP Transfer Data
  4004304h 2   DSP_PADR   DSP Transfer Address
  4004308h 2   DSP_PCFG   DSP Configuration
  400430Ch 2   DSP_PSTS   DSP Status
  4004310h 2   DSP_PSEM   DSP ARM9-to-DSP Semaphore          (R/W)
  4004314h 2   DSP_PMASK  DSP DSP-to-ARM9 Semaphore Mask     (R/W)
  4004318h 2   DSP_PCLEAR DSP DSP-to-ARM9 Semaphore Clear    (W)
  400431Ch 2   DSP_SEM    DSP DSP-to-ARM9 Semaphore Data     (R)
  4004320h 2   DSP_CMD0   DSP ARM9-to-DSP Command Register 0 (R/W)
  4004324h 2   DSP_REP0   DSP DSP-to-ARM9 Reply Register 0   (R)
  4004328h 2   DSP_CMD1   DSP ARM9-to-DSP Command Register 1 (R/W)
  400432Ch 2   DSP_REP1   DSP DSP-to-ARM9 Reply Register 1   (R)
  4004330h 2   DSP_CMD2   DSP ARM9-to-DSP Command Register 2 (R/W)
  4004334h 2   DSP_REP2   DSP DSP-to-ARM9 Reply Register 2   (R)
  4004340h C0h DSP_mirror Mirrors of above 40h-byte DSP register area

ARM7 DSi
  4000004h 2   DISPSTAT (new Bit6, LCD Initialization Ready Flag) (as DSi9?)
  40001C0h 2   SPICNT   (new Bit2, for 8MHz transfer clock)
  4000204h 2   EXMEMCNT (removed Bit0-7: GBA-slot related bits)   (as DSi9?)
  4000210h 4   IE       (new interrupt sources, removed GBA-slot IRQ)
  4000214h 4   IF       (new interrupt sources, removed GBA-slot IRQ)
  4000218h     IE2      (new register with more new interrupt sources)
  400021Ch     IF2      (new register with more new interrupt sources)
ARM7 DSi Maybe 2nd ROM slot (DSi prototypes did have 2 cartridge slots)
  40021A0h 4   Unknown, nonzero, probably related to below 40021A4h
  40021A4h 4   Unknown, related to 40001A4h (Gamecard Bus ROMCTRL)
  40021A8h ..
  40021Bxh ..
  4102010h 4
ARM7 DSi System Control
  4004000h 1   SCFG_A9ROM used by BIOS and SystemFlaw   (bit0,1)
  4004001h 1   SCFG_A7ROM used by BIOS and SystemFlaw   (bit0,1,2)
  4004004h 2   SCFG_CLK7  used by SystemFlaw
  4004006h 2   SCFG_JTAG  Debugger Control
  4004008h 4   SCFG_EXT7  used by SystemFlaw
  4004010h 2   SCFG_MC    Memory Card Interface Control (R/W)  ;\
  4004012h 2   SCFG_CARD_INSERT_DELAY (usually 1988h = 100ms)  ; Game Cartridge
  4004014h 2   SCFG_CARD_PWROFF_DELAY (usually 264Ch = 150ms)  ;/
  4004020h 2   SCFG_WL    Wireless Disable    ;bit0 = wifi?
  4004024h 2   SCFG_OP    Debugger Type (R)   ;bit0-1 = (0=retail, ?=debug)
ARM7 DSi New Shared WRAM Bank Control
  4004040h 4   MBK1       WRAM-A Slots for Bank 0,1,2,3  ;\
  4004044h 4   MBK2       WRAM-B Slots for Bank 0,1,2,3  ; Global ARM7+ARM9
  4004048h 4   MBK3       WRAM-B Slots for Bank 4,5,6,7  ; Slot Mapping (R)
  400404Ch 4   MBK4       WRAM-C Slots for Bank 0,1,2,3  ; (set on ARM9 side)
  4004050h 4   MBK5       WRAM-C Slots for Bank 4,5,6,7  ;/
  4004054h 4   MBK6       WRAM-A Address Range           ;\Local ARM7 Side
  4004058h 4   MBK7       WRAM-B Address Range           ; (R/W)
  400405Ch 4   MBK8       WRAM-C Address Range           ;/
  4004060h 4   MBK9       WRAM-A/B/C Slot Write Protect (R/W)
ARM7 DSi New DMA (NDMA)
  4004100h 74h NewDMA (new DMA, as on ARM9i, see there)
ARM7 DSi AES Encryption Unit
  4004400h 4   AES_CNT    (R/W)
  4004404h 4   AES_BLKCNT (W)
  4004408h 4   AES_WRFIFO (W)
  400440Ch 4   AES_RDFIFO (R)
  4004420h 16  AES_IV     (W)
  4004430h 16  AES_MAC    (W)
  4004440h 48  AES_KEY0   (W) ;used for modcrypt
  4004470h 48  AES_KEY1   (W) ;used for ?
  40044A0h 48  AES_KEY2   (W) ;used for JPEG signatures
  40044D0h 48  AES_KEY3   (W) ;used for eMMC sectors
ARM7 DSi I2C Bus
  4004500h 1   I2C_DATA
  4004501h 1   I2C_CNT
ARM7 DSi Microphone
  4004600h 2   MIC_CNT    Microphone Control
  4004604h 4   MIC_DATA   Microphone FIFO
ARM7 DSi SNDEX
  4004700h 2   SNDEXCNT             <-- can be read even in DS mode!
ARM7 DSi SD/MMC Registers for Memory Card access (SD Card and onboard eMMC)
  4004800h 2   SD_CMD              Command and Response/Data Type
  4004802h 2   SD_CARD_PORT_SELECT   (SD/MMC:020Fh, SDIO:010Fh)
  4004804h 4   SD_CMD_PARAM0-1     Argument (32bit, 2 halfwords)
  4004808h 2   SD_STOP_INTERNAL_ACTION
  400480Ah 2   SD_DATA16_BLK_COUNT        "Transfer Block Count"
  400480Ch 16  SD_RESPONSE0-7 (128bit, 8 halfwords)
  400481Ch 4   SD_IRQ_STATUS0-1  ;IRQ Status  (0=ack, 1=req)
  4004820h 4   SD_IRQ_MASK0-1    ;IRQ Disable (0=enable, 1=disable)
  4004824h 2   SD_CARD_CLK_CTL Card Clock Control
  4004826h 2   SD_DATA16_BLK_LEN  Memory Card Transfer Data Length
  4004828h 2   SD_CARD_OPTION Memory Card Option Setup (can be C0FFh)
  400482Ah 2   Fixed always zero?
  400482Ch 4   SD_ERROR_DETAIL_STATUS0-1   Error Detail Status
  4004830h 2   SD_DATA16_FIFO        Data Port  (SD_FIFO?)
  4004832h 2   Fixed always zero?       ;(TC6371AF:BUF1 Data MSBs?)
  4004834h 2   SD_CARD_IRQ_CTL          ;(SD_TRANSACTION_CTL)
  4004836h 2   SD_CARD_IRQ_STAT         ;(SD_CARD_INTERRUPT_CONTROL)
  4004838h 2   SD_CARD_IRQ_MASK         ;(SDCTL_CLK_AND_WAIT_CTL)
  400483Ah 2   Fixed always zero?       ;(SDCTL_SDIO_HOST_INFORMATION)
  400483Ch 2   Fixed always zero?       ;(SDCTL_ERROR_CONTROL)
  400483Eh 2   Fixed always zero?       ;(TC6387XB: LED_CONTROL)
  4004840h 2   Fixed always 003Fh?
  4004842h 2   Fixed always 002Ah?
  4004844h 6Eh Fixed always zerofilled?
  40048B2h 2   Fixed always FFFFh?
  40048B4h 6   Fixed always zerofilled?
  40048BAh 2   Fixed always 0200h?
  40048BCh 1Ch Fixed always zerofilled?
  40048D8h 2   SD_DATA_CTL
  40048DAh 6   Fixed always zerofilled?
  40048E0h 2   SD_SOFT_RESET  Software Reset (bit0=SRST=0=reset)
  40048E2h 2   Fixed always 0009h?      ;(RESERVED2/9, TC6371AF:CORE_REV)
  40048E4h 2   Fixed always zero?
  40048E6h 2   Fixed always zero?       ;(RESERVED3, TC6371AF:BUF_ADR)
  40048E8h 2   Fixed always zero?       ;(TC6371AF:Resp_Header)
  40048EAh 6   Fixed always zerofilled?
  40048F0h 2   Fixed always zero?       ;(RESERVED10)
  40048F2h 2   ? Can be 0003h
  40048F4h 2   ? Can be 0770h
  40048F6h 2   SD_WRPROTECT_2 (R)  ;Write protect for eMMC   (RESERVED4)
  40048F8h 4   SD_EXT_IRQ_STAT0-1  ;Insert/eject for eMMC    (RESERVED5-6)
  40048FCh 4   SD_EXT_IRQ_MASK0-1       ;(TC6371AF:Revision) (RESERVED7-8)
  4004900h 2   SD_DATA32_IRQ
  4004902h 2   Fixed always zero?
  4004904h 2   SD_DATA32_BLK_LEN
  4004906h 2   Fixed always zero?
  4004908h 2   SD_DATA32_BLK_COUNT
  400490Ah 2   Fixed always zero?
  400490Ch 4   SD_DATA32_FIFO
  4004910h F0h Fixed always zerofilled?
ARM7 DSi SD/MMC Registers for SDIO access (for Atheros Wifi)
  4004A00h 512 SDIO_xxx (same as SD_xxx at 4004800h..40049FFh, see there)
  4004A02h 2   SDIO_CARD_PORT_SELECT (slightly different than 4004802h)
ARM7 DSi General Purpose I/O (GPIO) (headphone connect, power button)
  4004C00h 1   GPIO Data In                (R)  (even in DS mode)
  4004C00h 1   GPIO Data Out               (W)
  4004C01h 1   GPIO Data Direction         (R/W)
  4004C02h 1   GPIO Interrupt Edge Select  (R/W)
  4004C03h 1   GPIO Interrupt Enable       (R/W)
  4004C04h 2   GPIO_WIFI                   (R/W)
ARM7 DSi CPU/Console ID (used as eMMC key)
  4004D00h 8   CPU/Console ID Code (64bit) (R)
  4004D08h 2   CPU/Console ID Flag (1bit)  (R)
ARM7 DSi Junk?
  8030200h 2   GBA area, accessed alongsides with SDIO port [4004A30h] (bug?)

Main Memory Control
  2FFFFFEh 2   Main Memory Control (for 16MByte RAM chip)
  DFFFFFEh 2   Main Memory Control (extra 16MByte RAM chip in debug version)


extracted from no$gba v3.05 - homepage - patreon - whole doc htm/txt - copyright 2021 martin korth (nocash)