Datasheet

85
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
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.
Atmel provides an INF example to see the device as a new serial port and also provides another custom driver
used by the SAM-BA application: atm6124.sys. Refer to the document USB Basic Application, literature number
6123, for more details.
12.10.3.1 Enumeration Process
The USB protocol is a master/slave protocol. This is the host that starts the enumeration sending requests to the
device through the control endpoint. The device handles standard requests as defined in the USB Specification.
The device also handles some class requests defined in the CDC class.
Unhandled requests are STALLed.
12.10.3.2 Communication Endpoints
There are two communication endpoints and endpoint 0 is used for the enumeration process. Endpoint 1 is a 64-
byte Bulk OUT endpoint and endpoint 2 is a 64-byte Bulk IN endpoint. SAM-BA Boot commands are sent by the
host through the endpoint 1. If required, the message is split by the host into several data payloads by the host
driver.
If the command requires a response, the host can send IN transactions to pick up the response.
12.11 Hardware and Software Constraints
 The DataFlash, Serial Flash, NAND Flash, SDCard
(1)
, and EEPROM downloaded code size is limted to
156 Kbytes.
 The code is always downloaded from the device address 0x0000_0000 to the address 0x0000_0000 of the
internal SRAM (after remap).
 The downloaded code must be position-independent or linked at address 0x0000_0000.
 The DataFlash must be connected to NPCS0 of the SPI.
Note: 1. Boot ROM does not support high capacity SDCards.
Table 12-3. Handled Standard Requests
Request Definition
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.
Table 12-4. Handled Class Requests
Request Definition
SET_LINE_CODING Configures DTE rate, stop bits, parity and number of character bits.
GET_LINE_CODING Requests current DTE rate, stop bits, parity and number of character bits.
SET_CONTROL_LINE_STATE RS-232 signal used to tell the DCE device the DTE device is now present.