AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 567

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

34.5.2.6
34.5.2.7
1768I–ATARM–09-Jul-09
Status OUT Transfer
Stall Handshake
Figure 34-12. Data Out Followed by Status IN Transfer.
Once a control request has been processed and the requested data returned, the host acknowl-
edges by sending a zero length packet. This is a zero length Data OUT transaction.
Figure 34-13. Data IN Followed by Status OUT Transfer
A stall handshake can be used in one of two distinct occasions. (For more information on the
stall handshake, refer to Chapter 8 of the Universal Serial Bus Specification, Rev 1.1.)
1. The USB device receives a zero length packet. It sets RX_DATA_BK0 flag in the
2. The microcontroller is notified that the USB device has received a zero length packet
3. The microcontroller must clear RX_DATA_BK0.
USB Bus
Packets
RX_DATA_BKO
(USB_CSRx)
TXPKTRDY
(USB_CSRx)
UDP_CSRx register and acknowledges the zero length packet.
sent by the host polling RX_DATA_BK0 in the UDP_CSRx register. An interrupt is pend-
ing while RX_DATA_BK0 is set. The number of bytes received in the endpoint’s
UDP_BCR register is equal to zero.
USB Bus
Packets
RX_DATA_BKO
(USB_CSRx)
TXCOMP
(USB_CSRx)
Host Sends the Last
Data Payload to the Device
PID
Data OUT
Set by USB Device
Data IN
PID
Device Sends the Last
Data Payload to Host
Set by Firmware
Set by USB Device
Data OUT
Data IN
NAK
PID
Set by USB Device
Device Sends a Status IN
to the Host
Interrupt Pending
ACK
PID
Data IN
PID
Cleared by Firmware
Cleared by Firmware
Device Sends a
Status OUT to Host
Data OUT
PID
ACK
PID
ACK
PID
Interrupt Pending
AT91RM9200
Cleared by Firmware
Cleared by USB Device
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