ALFAT-SC-340 GHI Electronics, ALFAT-SC-340 Datasheet - Page 30

• Manufacturer Part Number: ALFAT-SC-340
• Description: Processors - Application Specialized FILE SYSTEM SoC with DUAL USB HOST & SD
• Manufacturer: GHI Electronics
• Type: File Systemsr

Specifications of ALFAT-SC-340

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: ALFAT
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 24 MHz
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP-64
• Interface Type: I2C, SPI, UART
• Part # Aliases: GHI-ALFAT-SC-340

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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