Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

513

SAM9G25 [DATASHEET]

11032C–ATARM–25-Jan-13

A transfer is composed of one or several transactions;

Notes: 1. Control transfer must use endpoints with one bank and can be aborted using a stall handshake. 

2. Isochronous transfers must use endpoints configured with two or three banks.

An endpoint handles all transactions related to the type of transfer for which it has been configured. 

Note:

1. In Isochronous Mode (Iso), it is preferable that High Band Width capability is available.

The size of internal DPRAM is 4

 

KB.

Suspend and resume are automatically detected by the UDPHS device, which notifies the processor by raising an
interrupt.

Each transfer results in one or more transactions over the USB bus.

There are five kinds of transactions flowing across the bus in packets:

1.

Setup Transaction

2.

Data IN Transaction

3.

Data OUT Transaction

4.

Status IN Transaction

5.

Status OUT Transaction

Control Transfers 

• Setup transaction 

→

 Data IN transactions 

∅Status OUT transaction

• Setup transaction 

→

 Data OUT transactions 

∅Status IN transaction

• Setup transaction 

→ 

Status IN transaction

Bulk IN Transfer

• Data IN transaction 

→

 Data IN transaction

Interrupt IN Transfer

• Data IN transaction 

→

 Data IN transaction

Isochronous IN Transfer

 

• Data IN transaction 

→

 Data IN transaction

Bulk OUT Transfer

• Data OUT transaction 

→

 Data OUT transaction

Interrupt OUT Transfer

• Data OUT transaction 

→

 Data OUT transaction

Isochronous OUT Transfer

 

• Data OUT transaction

→

 Data OUT transaction

0

EPT_0

1

N

N

64

Control

1

EPT_1

2

Y

Y

1024

Ctrl/Bulk/Iso

/Interrupt

2

EPT_2

2

Y

Y

1024

Ctrl/Bulk/Iso

/Interrupt

3

EPT_3

3

Y

N

1024

Ctrl/Bulk/Iso

/Interrupt

4

EPT_4

3

Y

N

1024

Ctrl/Bulk/Iso

/Interrupt

5

EPT_5

3

Y

Y

1024

Ctrl/Bulk/Iso

/Interrupt

6

EPT_6

3

Y

Y

1024

Ctrl/Bulk/Iso

/Interrupt