ALFAT-OM-337 GHI Electronics, ALFAT-OM-337 Datasheet - Page 30

• 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
Important note: Data sent through SPI DMA channel should NOT be sent through an
SPI Write
access reference code library provides an example how to use L command and access
SPI DMA.
Format
1. User: requests sending data using L command like any regular command send
2. ALFAT: accepts the request and sends the acknowledgment to the user over SPI
3. ALFAT:
4. User: checks SPI_BUSY. If it is not busy then sends 8192 Bytes or less.
5. User: repeats step 4 until all the requested data through L command is sent out
6. ALFAT: after the user sends all the data, ALFAT acknowledges the user with the
7. User: checks SPI_BUSY. If not busy then reads the acknowledgment mentioned
over SPI through a
through a
to ALFAT.
Note: the user can not terminate sending the data. so if the requested data-to-be-
written size is 3MBytes, then the user MUST send all the 3MBytes.
written data size in a
in step 6.
Transaction. Check
Opens SPI DMA
SPI Read
through SPI DMA channel
L
(ssssssss bytes)
User sends data
<SP>
SPI Read Frame:
SPI Write Frame:
SPI Read Frame:
$aaaaaaaa
n>ssssssss
SPI Write
!00
Transaction.
!00
SPI Read
<LF>
<LF>
SPI DMA receive channel
channel.
<LF>
Transaction.
<LF>
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Transaction.
n File Handle 0, 1, 2,3,4,5,6, 7, 8,
9, A, B, C, D, E or F.
ssssssss 4 bytes Max. in HEX
data size to be written
aaaaaaaa 4 bytes always in HEX
actual written size
for more details. Also ALFAT
ALFAT SoC Processor
ALFAT Command Set
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