Seco Qseven QuadMo747 x2000 User Manual page 34

3.2.3.6 SD interface signals
Optionally, the module can be equipped with a SD/MMC Card reader, interfaced to USB port #7. In this case, USB port#7 will not be externally available.
Such an SD/MMC Card reader complies with SD Specification version 2.0, and with MMC specification up to version 4.2, 4-bit data bus.
The SD port is externally accessible through the golden card edge connector, and can work in 1-bit and 4-bit mode.
Signals involved with SD interface are the following:
SDIO_PWR#: SD power enable. Active Low Output signal, electrical level +3.3V_S with 10kΩ pull-up resistor. This signal can be used on the Carrier board to
enable the power line for the SD card.
SDIO_CD#: Card Detect Input. Active Low Signal, electrical level +3.3V_S. This signal must be externally pulled low to signal that a SD Card Device is present.
SDIO_CLK: Clock Line (output), 50MHz maximum frequency for SD High Speed Mode.
SDIO_CMD: Command/Response line. Bidirectional signal, electrical level +3.3V_S, used to send command from the Host (SD/MMC Card reader) to the
connected card, and to send the response from the card to the Host.
SDIO_WP: Write Protect input, electrical level +3.3V_S. It is used to communicate the status of Write Protect switch of the external SD card. Since microSD cards
don't manage this signal, it is important that, when 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_LED: Transfer indicator output, electrical level +3.3V_S with 10kΩ pull-up resistor. This signal can be used to drive an external LED to indicate when there
are data transferring on the bus.
SDIO_DAT[0÷3]: SD Card data bus. SDIO_DAT0 signal is used for all communication modes. SDIO_DAT[1÷3] signals are required for 4-bit communication mode.
3.2.3.7 Audio interface signals
QuadMo747-x2000 module supports HD audio format, thanks to native support offered by the chipset to this audio codec standard.
Here following the signals related to HD Audio interface:
HDA_SYNC: HD Audio Serial Bus Synchronization. 48kHz fixed rate output from the module to the Carrier board, electrical level +3.3V_S.
HDA_RST#: HD Audio Codec Reset. Active low signal, output from the module to the Carrier board, electrical level +3.3V_S.
HDA_BCLK: HD Audio Serial Bit Clock signal. 24MHz serial data clock, output from the module to the Carrier board, electrical level +3.3V_S.
HDA_SDO: HD Audio Serial Data Out signal. Output from the module to the Carrier board, electrical level +3.3V_S.
HDA_SDI: HD Audio Serial Data In signal. Input to the module from the Carrier board, electrical level +3.3V_S.
All these signals have to be connected, on the Carrier Board, to an HD Audio Codec. Please refer to the chosen Codec's Reference Design Guide for correct
implementation of audio section on the carrier board.
QuadMo747-x2000
QuadMo747-x2000 User Manual - Rev. First Edition: 1.0 - Last Edition: 2.0 - Author: S.B. - Reviewed by G.G. Copyright © 2014 SECO S.r.l.
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