AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 93

• Manufacturer Part Number: AT91RM9200-CI-002
• Description: IC ARM9 MCU 256 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-CI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

13.4.1.3
13.4.1.4
1768I–ATARM–09-Jul-09
DFU Protocol
USB Device Port
Figure 13-9. Xmodem Transfer Example
A 48 MHz USB clock is necessary to use USB Device port. It has been programmed earlier in
the device initialization with PLLB configuration.
The DFU allows upgrade of the firmware of USB devices. The DFU algorithm is a part of the
USB specification. For more details, refer to “USB Device Firmware Upgrade Specification, Rev.
1.0”.
There are four distinct steps when carrying out a firmware upgrade:
Figure 13-10. DFU Protocol
1. Enumeration: The device informs the host of its capabilities.
2. Reconfiguration: The host and the device agree to initiate a firmware upgrade.
3. Transfer: The host transfers the firmware image to the device. Status requests are
4. Manifestation: Once the device reports to the host that it has completed the reprogram-
employed to maintain synchronization between the host and the device.
ming operations, the host issues a reset and the device executes the upgraded
firmware.
Host
Host
SOH 02 FD Data[128] CRC CRC
SOH 01 FE Data[128] CRC CRC
SOH 03 FC Data[100] CRC CRC
Prepare to exit DFU mode
Download this firmware
Prepare for an upgrade
DFU mode activated
USB reset
USB reset
ACK
EOT
ACK
ACK
ACK
C
Device
Device
AT91RM9200
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