ATSAMA5D35A-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATSAMA5D35A-CU

SMART ARM-based MPU

Atmel Corporation 

11.5.3 USB Device Port

11.5.3.1 Supported External Crystal / External Clocks

The SAM-BA Monitor supports a frequency of 12, 16, 24 or 48 MHz to allow USB communication for both external

crystal and external clock.

11.5.3.2 USB Class

The device uses the USB Communication Device Class (CDC) drivers to take advantage of the installed PC Serial

Communication software to talk over the USB. The CDC class is implemented in all releases of Windows

beginning with Windows 98SE®. The CDC document, available at www.usb.org, describes how to implement

devices such as ISDN modems and virtual COM ports.

The vendor ID for Atmel is ID 0x03EB. The product ID is 0x6124. These references are used by the host operating

system to mount the correct driver. On Windows systems, INF files contain the correspondence between vendor

ID and product ID.

11.5.3.3 Enumeration Process

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.

Table 11-5. 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

The device also handles some class requests defined in the CDC class.

Table 11-6. 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 indicate to the DCE device that the DTE device is now present

Unhandled requests are STALLed.

11.5.3.4 Communication Endpoints

Endpoint 0 is used for the enumeration process.

Endpoint 1 (64-byte Bulk OUT) and endpoint 2 (64-byte Bulk IN) are used as communication endpoints.

SAM-BA Boot commands are sent by the host through Endpoint 1. If required, the message is split into several

data payloads by the host driver.

If the command requires a response, the host sends IN transactions to pick up the response.

78 SAMA5D3 Series [DATASHEET]

Atmel-11121F-ATARM-SAMA5D3-Series-Datasheet_02-Feb-16

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