SM-B69
SM-B69 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author:A.R - Reviewed by M.B. - Copyright © 2020 SECO S.p.A.
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On the carrier board, these signals can be carried out directly to a SATA M 7p connector or switched for an M.2 SSD Slot, which allow plugging M.2 Socket 2 Key
B Solid State Drives. Please refer to the following schematics as an example of connection of SATA interface on the carrier board to selected connector.
3.2.1.7
SDI/O interface signals
The Intel
®
family of SOCs formerly coded as Apollo Lake offers one SD Card controller, able to support SD Card 3.0 interface.
Such an SD controller complies with SD Host Controller Standard Specification version 3.01.
The SD port is externally accessible through the SD Card Slot connector, can work in 1-bit and 4-bit mode operation with data rate up to 104MB/s
The signals related to SDIO are as follows:
SDIO_WP: Write Protect input, electrical level +3.3V_RUN
-up resistor. It is used to communicate the status of Write Protect switch of the external
SD card. Since microSD car
n designing carrier boards with microSD slots, this signal must be tied to GND,
otherwise the OS will always consider the card as protected from writing.
SDIO_CMD: Command/Response line. Bidirectional signal, electrical level +3.3V_RUN, used to send command from Host (Intel processor) to the connected card,
and to send the response from the card to the Host.
SDIO_CD#: Card Detect Input. Active Low Signal, electrical level +3.3V_RUN
-up resistor. This signal must be externally pulled low to signal that a
SDIO/MMC Card is present.
SDIO_CK: Clock Line (output), 50 MHz maximum frequency for SD/SDIO High Speed Mode.
SDIO_PWR_EN: SDIO Power Enable output, active high signal, electrical level +3.3V_RUN
-down resistor. It is used to enable the power line
supplying SD/SDIO/MMC devices.
SDIO_[D0÷D3]: SD Card data bus. SDIO_D0 signal is used for all communication modes. SDIO_[D1÷D3] signals are required for 4-bit communication mode.
Please refer to the following schematics as an example of connection of SDIO interface on the carrier board, with Voltage clamping diodes highly recommended on
all signal lines for ESD suppression.
