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3.2.3.6 SD interface signals
AMD G-Series SOCs embed a SD 3.0 compliant Host controller, supporting SDHC and SDXC UHS-I cards (speed transfer up to 104 MB/S with 4-bit SD cards).
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. 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).
SDIO_CMD: Command/Response line. Bidirectional signal, electrical level +3.3V_S, used to send command from the Host 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. 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
Q7-A29 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.
Q7-A29
Q7-A29 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by G.G. Copyright © 2016 SECO S.r.l.
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