ALFAT-OM-337 GHI Electronics, ALFAT-OM-337 Datasheet - Page 14

• 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

SPI interface uses four hardware signals:
Note: ALFAT access reference code library, available with ALFAT's downloads, provides an
example how to use SPI interface.
Sending and receiving data to and from ALFAT over SPI is performed through frame
transactions which is a layer that resides between the actual SPI data bus and the
communication stream (commands, responses, data). It is important to know that SPI
frame transaction layer is independent from how ALFAT commands work.
4.3. SPI Interface Mode
GHI Electronics
Rev. 1.13
Communication Stream
UART configurations
Write Transaction
Request Frame
The frame consists of two parts, a header and payload.
Frame Transaction
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SPI_SSEL: ALFAT Chip Select.
SPI_MOSI: ALFAT Data in.
SPI_MISO: ALFAT Data out.
SPI_BUSY: This should be monitored while sending data to ALFAT. When it is high,
no more data should be exchanged with ALFAT till it gets low.
SPI Bus
The default baud rate is 115200. The maximum tested baud rate is 3M. To
change the baud rate use B command.
Data bits: 8
Parity: None
Stop bit: 1
The header consists of three bytes. The first byte is the frame type, the second
and the third bytes are 16-bit transaction length (Not including the header).
Payload: This is actual transaction payload needed to be sent to ALFAT. The
payload section size MUST match the declared in the transaction size field.
01
08
Write Frame: @ M:\TES
00
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ALFAT access interface
ALFAT SoC Processor
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