ALFAT-OM-337 GHI Electronics, ALFAT-OM-337 Datasheet - Page 23

• Manufacturer Part Number: ALFAT-OM-337
• Description: Memory IC Development Tools ALFAT USB / SD to UART / SPI OEM BOARD
• Manufacturer: GHI Electronics

Specifications of ALFAT-OM-337

• Rohs: yes
• Product: SD OEM Board
• Tool Is For Evaluation Of: SD, SDHC, MMC Cards, USB drives
• Memory Type: Flash
• Operating Supply Voltage: 3.3 V
• Description/function: OEM board offers a seamless way to access files on SD & MMC cards and on USB memory drives
• Interface Type: I2C, SPI, UART, USB
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Part # Aliases: GHI-ALFAT-OM-337

GHI Electronics
Rev. 1.13
Note1: WP pin MUST be connected to ground if Write protection signal is not used in
the hardware design.
Note2: CD pin MUST be connected to ground if Card Detect signal is not used in the
hardware design.
† Important note: If ULPI PHY is implemented in the design (like in ALFAT OEM
board), then the USB mass storage device connected to USB1 MUST be initialized in
High-Speed mode (even if the USB device does not support High-Speed mode).
Initializing it in Full-Speed might cause an undesirable performance.
The default SD bus clock frequency is 12MHz. This frequency works on the majority of
the memory cards. Some cards can work with higher frequency up to 24MHz. This will
enhance the memory access speed a little bit. The initialize command gives the user the
option to choose other than the default clock frequency.
Important note 1: Most of the SD cards works with 24MHz. but not the majority. Cards
that do not work with this high frequency will accept to be initialize but the is about 20%
chance that it will fail to process write sector requests. So it is highly recommended to
use the default frequency if the final application should work with the majority of the
Initializing memory card with different clock frequency:
Format
Example I
Format
Example I
I
!
!00
I
!00
I
!00
I
!00
I
!
!00
00
00
<SP>
<SP>
<SP>
<SP>
<SP>
<SP>
<SP>
<LF>
<LF>
<LF>
<LF>
<LF>
<LF>
<LF>
X:
M:
U0:
U1:
U1:H
M:>d
M:>0
<LF>
<LF>
<LF>
<LF>
<LF>
<LF>
<LF>
Page 23 of 51
X: Drive name:
M: Memory Card drive
U0: USB Flash drive 0 Full-Speed
U1: USB Flash drive 1 Full-Speed
U1:H USB Flash drive 1 High-Speed.
Requires an external HS PHY.
Initialize memory card with the default
clock frequency.
Initialize USB 0 at Full-Speed mode
Initialize USB 1 at Full-Speed mode
Initialize USB 1 at High-Speed mode
d: SD bus clock frequency mode
0: 24MHz.
1: 16MHz.
2: 12 MHZ. (the default value)
3: 9.6MHZ.
4: 8 MHz.
Initialize memory card with 24MHz.
clock frequency.
ALFAT SoC Processor
ALFAT Command Set
www.ghielectronics.com
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