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−[[File:Gamecard.jpg|thumb|right|A 3DS gamecard]]
−[[File:GamecardPhy.jpg|thumb|right|Close-up of PCB]]
−===Physical interface===
−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.
−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.
−{| class="wikitable" border="1"
−|-
−! Pin
−! Name
−! Description
−|-
−| 1
−| GND
−| Ground
−|-
−| 2
−| CLK
−| Clock. Frequencies 6.7MHz and 4.2MHz)
−|-
−| 3
−| NC
−| Not connected. Possibly used to program cards.
−|-
−| 4
−| RCS
−| ROM select, active low. Pulled low to start a ROM transfer.
−|-
−| 5
−| RST
−| Reset, active low.
−|-
−| 6
−| ECS
−| Savegame chip select, active low. Pulled low to start a savegame SPI transfer.
−|-
−| 7
−| IRQ
−| Removal detection.
−|-
−| 8
−| VCC
−| Powersupply 3.3V.
−|-
−| 9
−| DAT0
−| Bidirectional data bus.
−|-
−| 10
−| DAT1
−| Bidirectional data bus.
−|-
−| 11
−| DAT2
−| Bidirectional data bus.
−|-
−| 12
−| DAT3
−| Bidirectional data bus.
−|-
−| 13
−| DAT4
−| Bidirectional data bus / pin ? to savegame chip{{check}}
−|-
−| 14
−| DAT5
−| Bidirectional data bus / pin ? to savegame chip{{check}}
−|-
−| 15
−| DAT6
−| Bidirectional data bus / SPI data from savegame chip.
−|-
−| 16
−| DAT7
−| Bidirectional data bus / SPI data to savegame chip.
−|-
−| 17
−| GND
−| Ground
−|}
−===SPI flash===
−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.
−===Protocol===
−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.
−After the sixth transfer, commands change size from 8 bytes to 16 bytes. Possibly a new encryption is used, such as AES CTR.
−Here's a set of sample gamecard commands that a 3DS sends to a 3DS gamecard:
−{| class="wikitable" border="1"
−|-
−! Size
−! Command
−! Description
−|-
−|2000
−|9F00000000000000
−| Reset
−|-
−|0000
−|71C93FE9BB0A3B18
−| Unknown
−|-
−|0004
−|9000000000000000
−| Get gamecard ID, response=9000FEC2
−|-
−|0004
−|9000000000000000
−| Get gamecard ID, response=9000FEC2
−|-
−|0004
−|A000000000000000
−| Unknown, response=00000000
−|-
−|0000
−|3E00000000000000
−| Enter 16-byte command mode.
−|-
−|07EC
−|82000000000000000000000000000000
−| Get header
−|-
−|05E3
−|F32C92D85C9D44DED3E0E41DBE7C90D9
−| Encrypted, unknown
−|-
−|0332
−|696B9D8582FB55D31B68CAFE70C74A95
−| Encrypted, unknown
−|-
−|0332
−|BAA4812CA0AC9C5D19399530E3ACCCAB
−| Encrypted, unknown
−|-
−|032E
−|178E427C22D87ADB86387249A97D321A
−| Encrypted, unknown
−|-
−|0332
−|E06019B1BD5C9130ED6A4D9F4A9E7193
−| Encrypted, unknown
−|-
−|0332
−|4E0D224862523BBFE2E6255F80E15F37
−| Encrypted, unknown
−|-
−|0332
−|4CDF93D319FB62D0DB632A45E3E8D84C
−| Encrypted, unknown
−|-
−|0332
−|9AA5D80551002F955546D296A57F0FEF
−| Encrypted, unknown
−|-
−|0332
−|C12BA81AEF30DDDBD93FAD5D544C6334
−| Encrypted, unknown
−|-
−|0532
−|62EC5FB7F420AE1DC6253AE18AFA5BB3
−| Encrypted, read address 0
−|-
−|0332
−|E3FA23AA016BE0C93430D1F42FF41324
−| Encrypted, read address 0x4000
−|}
−The header command has some initial dummy bytes, and eventually responds with a 0x200 byte header. Here's an example for Lego Starwars 3:
− 0000000: 00 8c 03 00 00 00 04 00 00 00 00 00 00 00 00 00 ................
− 0000010: b3 cf fb c6 6a b1 cb 20 32 af ce 35 d4 1c 74 c9 ....j.. 2..5..t.
− 0000020: 8e 6b 27 2f 08 01 28 3b d4 30 de 44 37 f5 b0 46 .k'/..(;.0.D7..F
− 0000030: 91 59 d7 38 33 48 df 83 fd 71 84 2c 00 00 00 00 .Y.83H...q.,....
− 0000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 00000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000100: 4e 43 43 48 7a 7f 0e 00 00 8c 03 00 00 00 04 00 NCCHz...........
− 0000110: 36 34 02 00 00 00 00 00 00 8c 03 00 00 00 04 00 64..............
− 0000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
− 0000150: 43 54 52 2d 50 2d 41 4c 47 50 00 00 00 00 00 00 CTR-P-ALGP......
− 0000160: 0c 27 e3 c1 de 7b 2a e2 d3 11 4f 32 a4 ee bf 46 .'...{*...O2...F
− 0000170: 9a fd 0c f3 52 c1 1d 49 84 c2 a9 f1 d2 14 4c 63 ....R..I......Lc
− 0000180: 00 04 00 00 00 00 00 00 00 00 00 00 01 03 00 00 ................
− 0000190: 05 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................
− 00001a0: 06 00 00 00 1c 0a 00 00 01 00 00 00 00 00 00 00 ................
− 00001b0: 22 0a 00 00 58 75 0e 00 01 00 00 00 00 00 00 00 "...Xu..........
− 00001c0: 13 0c 04 26 15 f6 47 c4 c6 32 25 ea 9e 67 f8 a2 ...&..G..2%..g..
− 00001d0: 7b 15 24 6b 88 fb c7 a9 27 25 7b 84 97 7b 78 7b {.$k....'%{..{x{
− 00001e0: a6 5b ee 10 60 bb 6a 68 21 bb ce c6 00 03 5b 7e .[..`.jh!.....[~
− 00001f0: 64 fb 6e ac a7 f0 96 0c fb 1f 5a 37 08 77 28 f7 d.n.......Z7.w(.