Difference between revisions of "/talk まちゃぴろ"

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[[File:Gamecard.jpg|thumb|right|A 3DS gamecard]]
 
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[[File:GamecardPhy.jpg|thumb|right|Close-up of PCB]]
 
  
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===Physical interface===
 
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The 3DS gamecards have the same physical interface as regular DS and DSi gamecards. There is only a minor cosmetic difference in the plastic case, which has a small extruding notch on the top-right side. As such, it prevents insertion of the gamecard into old Nintendo DS or DSi systems.
 
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When modifying the case so that the 3DS gamecard fits in a DS or DSi system, those systems will refuse to detect the gamecard and show no banner icon.
 
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{| class="wikitable" border="1"
 
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|-
 
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!  Pin
 
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!  Name
 
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!  Description
 
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|-
 
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|  1
 
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|  GND
 
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|  Ground
 
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|-
 
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|  2
 
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|  CLK
 
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|  Clock. Frequencies 6.7MHz and 4.2MHz)
 
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|-
 
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|  3
 
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|  NC
 
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|  Not connected. Possibly used to program cards.
 
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|-
 
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|  4
 
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|  RCS
 
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|  ROM select, active low. Pulled low to start a ROM transfer.
 
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|-
 
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|  5
 
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|  RST
 
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|  Reset, active low.
 
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|-
 
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|  6
 
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|  ECS
 
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|  Savegame chip select, active low. Pulled low to start a savegame SPI transfer.
 
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|-
 
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|  7
 
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|  IRQ
 
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|  Removal detection.
 
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|-
 
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|  8
 
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|  VCC
 
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|  Powersupply 3.3V.
 
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|-
 
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|  9
 
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|  DAT0
 
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|  Bidirectional data bus.
 
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|-
 
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|  10
 
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|  DAT1
 
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|  Bidirectional data bus.
 
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|-
 
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|  11
 
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|  DAT2
 
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|  Bidirectional data bus.
 
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|-
 
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|  12
 
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|  DAT3
 
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|  Bidirectional data bus.
 
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|-
 
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|  13
 
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|  DAT4
 
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|  Bidirectional data bus / pin ? to savegame chip{{check}}
 
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|-
 
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|  14
 
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|  DAT5
 
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|  Bidirectional data bus / pin ? to savegame chip{{check}}
 
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|-
 
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|  15
 
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|  DAT6
 
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|  Bidirectional data bus / SPI data from savegame chip.
 
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|-
 
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|  16
 
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|  DAT7
 
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|  Bidirectional data bus / SPI data to savegame chip.
 
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|-
 
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|  17
 
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|  GND
 
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|  Ground
 
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|}
 
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===SPI flash===
 
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So far, only one savegame FLASH chip has been identified. The chip identifies as a 0xC22211. The JEDEC manufacturer ID is Macronix, and despite the chip label saying 25L1001 it is actually an MX25L1021E. Datasheet at: http://www.macronix.com/QuickPlace/hq/PageLibrary4825740B00298A3B.nsf/h_Index/3F21BAC2E121E17848257639003A3146/$File/MX25L1021E,%203V,%201Mb,%20v0.01.pdf.
 
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===Protocol===
 
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The communication protocol between the 3DS system and the 3DS gamecard has changed almost completely in comparison with the DS and DSi gamecard communication protocol.
 
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After the sixth transfer, commands change size from 8 bytes to 16 bytes. Possibly a new encryption is used, such as AES CTR.
 
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Here's a set of sample gamecard commands that a 3DS sends to a 3DS gamecard:
 
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{| class="wikitable" border="1"
 
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|-
 
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!  Size
 
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!  Command
 
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!  Description
 
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|-
 
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|2000
 
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|9F00000000000000
 
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| Reset
 
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|-
 
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|0000
 
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|71C93FE9BB0A3B18
 
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| Unknown
 
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|-
 
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|0004
 
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|9000000000000000
 
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| Get gamecard ID, response=9000FEC2
 
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|-
 
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|0004
 
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|9000000000000000
 
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| Get gamecard ID, response=9000FEC2
 
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|-
 
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|0004
 
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|A000000000000000
 
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| Unknown, response=00000000
 
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|-
 
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|0000
 
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|3E00000000000000
 
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| Enter 16-byte command mode.
 
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|-
 
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|07EC
 
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|82000000000000000000000000000000
 
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| Get header
 
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|-
 
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|05E3
 
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|F32C92D85C9D44DED3E0E41DBE7C90D9
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|696B9D8582FB55D31B68CAFE70C74A95
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|BAA4812CA0AC9C5D19399530E3ACCCAB
 
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| Encrypted, unknown
 
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|-
 
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|032E
 
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|178E427C22D87ADB86387249A97D321A
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|E06019B1BD5C9130ED6A4D9F4A9E7193
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|4E0D224862523BBFE2E6255F80E15F37
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|4CDF93D319FB62D0DB632A45E3E8D84C
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|9AA5D80551002F955546D296A57F0FEF
 
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| Encrypted, unknown
 
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|-
 
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|0332
 
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|C12BA81AEF30DDDBD93FAD5D544C6334
 
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| Encrypted, unknown
 
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|-
 
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|0532
 
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|62EC5FB7F420AE1DC6253AE18AFA5BB3
 
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| Encrypted, read address 0
 
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|-
 
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|0332
 
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|E3FA23AA016BE0C93430D1F42FF41324
 
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| Encrypted, read address 0x4000
 
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|}
 
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The header command has some initial dummy bytes, and eventually responds with a 0x200 byte header. Here's an example for Lego Starwars 3:
 
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0000000: 00 8c 03 00 00 00 04 00 00 00 00 00 00 00 00 00  ................
 
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0000010: b3 cf fb c6 6a b1 cb 20 32 af ce 35 d4 1c 74 c9  ....j.. 2..5..t.
 
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0000020: 8e 6b 27 2f 08 01 28 3b d4 30 de 44 37 f5 b0 46  .k'/..(;.0.D7..F
 
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0000030: 91 59 d7 38 33 48 df 83 fd 71 84 2c 00 00 00 00  .Y.83H...q.,....
 
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0000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000100: 4e 43 43 48 7a 7f 0e 00 00 8c 03 00 00 00 04 00  NCCHz...........
 
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0000110: 36 34 02 00 00 00 00 00 00 8c 03 00 00 00 04 00  64..............
 
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0000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
 
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0000150: 43 54 52 2d 50 2d 41 4c 47 50 00 00 00 00 00 00  CTR-P-ALGP......
 
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0000160: 0c 27 e3 c1 de 7b 2a e2 d3 11 4f 32 a4 ee bf 46  .'...{*...O2...F
 
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0000170: 9a fd 0c f3 52 c1 1d 49 84 c2 a9 f1 d2 14 4c 63  ....R..I......Lc
 
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0000180: 00 04 00 00 00 00 00 00 00 00 00 00 01 03 00 00  ................
 
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0000190: 05 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
 
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00001a0: 06 00 00 00 1c 0a 00 00 01 00 00 00 00 00 00 00  ................
 
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00001b0: 22 0a 00 00 58 75 0e 00 01 00 00 00 00 00 00 00  "...Xu..........
 
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00001c0: 13 0c 04 26 15 f6 47 c4 c6 32 25 ea 9e 67 f8 a2  ...&..G..2%..g..
 
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00001d0: 7b 15 24 6b 88 fb c7 a9 27 25 7b 84 97 7b 78 7b  {.$k....'%{..{x{
 
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00001e0: a6 5b ee 10 60 bb 6a 68 21 bb ce c6 00 03 5b 7e  .[..`.jh!.....[~
 
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00001f0: 64 fb 6e ac a7 f0 96 0c fb 1f 5a 37 08 77 28 f7  d.n.......Z7.w(.
 

Latest revision as of 13:45, 31 August 2011

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