Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

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SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

Xmodem Transfer Example 

The only frequency supported by SAM-BA Monitor to allow USB communication is a 12 MHz crystal or external
clock.

The device uses the USB communication device class (CDC) drivers to take advantage of the installed PC RS-232
software to talk over the USB. The CDC class is implemented in all releases of Windows

®

, from Windows 98SE

®

 to

Windows XP

®

, describes how to implement devices such as ISDN

modems and virtual COM ports.

The Vendor ID is Atmel’s vendor ID 0x03EB. The product ID is 0x6124. These references are used by the host
operating system to mount the correct driver. On Windows systems, the INF files contain the correspondence
between vendor ID and product ID. 

The USB protocol is a master/slave protocol. The host starts the enumeration, sending requests to the device
through the control endpoint. The device handles standard requests as defined in the USB Specification.

Host

Device

SOH 01 FE Data[128] CRC CRC

C

ACK

SOH 02 FD Data[128] CRC CRC

ACK

SOH 03 FC Data[100] CRC CRC

ACK

EOT

ACK

Handled Standard Requests 

GET_DESCRIPTOR

Returns the current device configuration value.

SET_ADDRESS

Sets the device address for all future device access.

SET_CONFIGURATION

Sets the device configuration.

GET_CONFIGURATION

Returns the current device configuration value.

GET_STATUS

Returns status for the specified recipient.

SET_FEATURE

Used to set or enable a specific feature.

CLEAR_FEATURE

Used to clear or disable a specific feature.