ALFAT-SD-338 GHI Electronics, ALFAT-SD-338 Datasheet - Page 42

• Manufacturer Part Number: ALFAT-SD-338
• Description: Memory IC Development Tools ALFAT SD / MMC OEM BOARD
• Manufacturer: GHI Electronics

Specifications of ALFAT-SD-338

• Rohs: yes
• Product: SD Board
• Tool Is For Evaluation Of: SD, SDHC, MMC Cards
• Memory Type: Flash
• Operating Supply Voltage: 3.3 V
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Part # Aliases: GHI-ALFAT-SD-338

With SD interface, ALFAT checks card detect input (pin 25/ CD)
before initializing the card. If CD is Low then ALFAT will accept
to initialize the card, otherwise ALFAT will reject the initialize
command. If card detect signal is not implemented in the
hardware design, then CD pin MUST be connected to GND.
The same for write protect, ALFAT checks write protection input
(pin 24/ WP) before performing any command that involves
writing to the memory card. if write protection signal is not
implemented in the hardware design, then WP pin MUST be
connected to GND.
To access the USB Full-Speed bus (12Mbps), two 22ohm resistors are needed to be
connected in serial with the data+(DP) and data- (DM) signals of each of ALFAT's USB
Host.
If higher file access speed is desired, a ULPI PHY (for example FUSB2805) can be added
on USB1 port, which will change the USB interface to High-Speed bus (480Mbps).
7.3. Card Detect and Write Protect signals
7.4. Full Speed / High Speed with ULPI PHY
GHI Electronics
Rev. 1.13
Page 42 of 51
Hardware integration guide
ALFAT SoC Processor
www.ghielectronics.com