at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 428

• Manufacturer Part Number: at91rm3400
• Description: Atmel Advanced At91 Arm Microcontroller
• Manufacturer: ATMEL Corporation

Please refer to chapters 8.4.5 and 9.4.5 of the Universal Serial Bus Specification, Rev. 2.0 to get more information on the
STALL handshake.
Control endpoints: during the data stage and status stage, this indicates that the microcontroller can not complete the
request.
Bulk and interrupt endpoints: notify the host that the endpoint is halted.
The host acknowledges the STALL, device firmware is notified by the STALLSENT flag.
• RX_DATA_BK1: Receive Data Bank 1 (only used by endpoints with ping-pong attributes)
This flag generates an interrupt while it is set to one.
Write (Cleared by the firmware)
0 = Notify USB device that data have been read in the FIFO’s Bank 1.
1 = No effect.
Read (Set by the USB peripheral)
0 = No data packet has been received in the FIFO's Bank 1.
1 = A data packet has been received, it has been stored in FIFO's Bank 1.
When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to
microcontroller memory. The number of bytes received is available in RXBYTECNT field. Bank 1 FIFO values are read
through USB_FDRx register. Once a transfer is done, the device firmware must release Bank 1 to the USB device by clear-
ing RX_DATA_BK1.
• DIR: Transfer Direction (only available for control endpoints)
Read/Write
0 = Allow Data OUT transactions in the control data stage.
1 = Enable Data IN transactions in the control data stage.
Please refer to Chapter 8.5.3 of the Universal Serial Bus Specification, Rev. 2.0 to get more information on the control data
stage.
This bit must be set before USB_CSRx/RXSETUP is cleared at the end of the setup stage. According to the request sent in
the setup data packet, the data stage is either a device to host (DIR = 1) or host to device (DIR = 0) data transfer. It is not
necessary to check this bit to reverse direction for the status stage.
• EPTYPE[2:0]: Endpoint Type
Read/Write
• DTGLE: Data Toggle
Read-only
0 = Identifies DATA0 packet.
1 = Identifies DATA1 packet.
Please refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0 to get more information on DATA0, DATA1
packet definitions.
428
000
001
101
010
110
011
111
AT91RM3400
Control
Isochronous OUT
Isochronous IN
Bulk OUT
Bulk IN
Interrupt OUT
Interrupt IN
1790A–ATARM–11/03