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service:hardware:appnote:connectsdcard

Connect a SD/SDIO/MMC-Card-Socket to a Trizeps

Schematic

Typical connection of a SD-Card Slot

This is the typical SD-Card-Slot schematic used on almost all of our baseboards: ConXS, uConXS, iPAN7.
(tap to enlarge pictue)

uSD-Card Slot without Card- and Write- Protect

This is the minimum configuration for a SD-Card-Slot. Check with Keith & Koep wether leaving the SDIO_CARD_DETECT-signal floating is supported by the BSP. Otherwise you need to connect SDIO_CARD_DETECT with a pull-up to 3.3V. The big disadvantage is, that you can't add or remove cards while the OS is running.
(tap to enlarge pictue)

SD-Card Slot connection when long signal traces used

This is a schematic for a SD-Card-Slot which is far away from the SODIMM-socket. i.e. the i-PAN7 Connector Board.
(tap to enlarge pictue)

Signals

Signal-Name SODIMM-Pin Remark
SDIO_CMD 190 add pull-up(10K..100K). This must have a smaller pull-up than SDIO_DATx-signals do.
SDIO_CLK 47
SDIO_DAT0 192 add pull-up(10K..100K)
SDIO_DAT1 81 add pull-up(10K..100K)
SDIO_DAT2 85 add pull-up(10K..100K)
SDIO_DAT3 51 add pull-up(10K..100K)
SDIO_CARD_DETECT 59 Connect in a way, that pin is high(3.3V) when card is inserted and low (0V) when card is removed. Note that other SD-card-sockets may have different ways how to handle their COMM, CD and WP pins.
SDIO_WRITE_PROTECT (any gpio)

A 100nF capacitor must be placed near the SDIO-card-socket pins VDD, VSS1, VSS2.

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service/hardware/appnote/connectsdcard.txt · Zuletzt geändert: 2011/06/08 12:28 von