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| 2
| CLK
| Clock. Frequencies 6.7MHz and 4.2MHz), 16.6MHz for SPI communication.
|-
| 3
| 13
| DAT4
| Bidirectional data bus / pin ? NC to savegame chip{{check}}
|-
| 14
| DAT5
| Bidirectional data bus / pin ? WP# to savegame chip{{check}}
|-
| 15
===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 , the JEDEC ID matches the MX25L1021E. Datasheet at: http://www.macronix.com/QuickPlace/hq/PageLibrary4825740B00298A3B.nsf/h_Index/3F21BAC2E121E17848257639003A3146/$File/MX25L1021E,%203V,%201Mb,%20v0.01.pdf. However, the MX25L1021E doesn't support the 4 bit wide transmission that the 3DS uses to talk to the SPI flash. It is thus likely that this is a custom flash chip.
===Protocol===
