at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 433

• Manufacturer Part Number: at91cap7e
• Description: Customizable Microcontroller
• Manufacturer: ATMEL Corporation

31.5
31.5.1
Figure 31-3. Example of USB V2.0 Full-speed Communication Control
The Control Transfer endpoint EP0 is always used when a USB device is first configured (USB v. 2.0 specifications).
31.5.1.1
Table 31-2.
31.5.1.2
8549A–CAP–10/08
Transfer
Control
Isochronous
Interrupt
Bulk
Functional Description
USB V2.0 Full-speed Introduction
Software Client 1
USB V2.0 Full-speed Transfer Types
USB Bus Transactions
USB Communication Flow
Unidirectional
Unidirectional
Unidirectional
Bidirectional
Direction
USB Host V2.0
The USB V2.0 full-speed provides communication services between host and attached USB
devices. Each device is offered with a collection of communication flows (pipes) associated with
each endpoint. Software on the host communicates with a USB device through a set of commu-
nication flows.
A communication flow is carried over one of four transfer types defined by the USB device.
Each transfer results in one or more transactions over the USB bus. There are three kinds of
transactions flowing across the bus in packets:
Data Flow: Control Transfer
Data Flow: Bulk In Transfer
Data Flow: Bulk Out Transfer
Software Client 2
Not guaranteed
Not guaranteed
Not guaranteed
Guaranteed
Bandwidth
Data Flow: Control Transfer
Data Flow: Isochronous In Transfer
Data Flow: Isochronous Out Transfer
Supported Endpoint Size
8, 16, 32, 64
8, 16, 32, 64
USB Device endpoint configuration requires that
in the first instance Control Transfer must be EP0.
256
≤ 64
EP0
EP4
EP0
EP1
EP2
EP5
Error Detection
USB Device 2.0
Block 1
USB Device 2.0
Block 2
Yes
Yes
Yes
Yes
AT91CAP7E
Automatic
Retrying
Yes
Yes
No
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