AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 565

• 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: -

Figure 34-10. Data OUT Transfer for Ping-pong Endpoint
34.5.2.4
1768I–ATARM–09-Jul-09
USB Bus
Packets
RX_DATA_BK0 Flag
(USB_CSRx)
RX_DATA_BK1 Flag
(USB_CSRx)
FIFO (DPR)
Bank 0
FIFO (DPR)
Bank 1
Status Transaction
Host Sends First Data Payload
Data OUT
PID
Set by USB Device,
Data Payload Written
in FIFO Endpoint Bank 0
Write by USB Device
Data OUT1
Note:
Warning: When RX_DATA_BK0 and RX_DATA_BK1 are both set, there is no way to determine
which one to clear first. Thus the software must keep an internal counter to be sure to clear alter-
natively RX_DATA_BK0 then RX_DATA_BK1. This situation may occur when the software
application is busy elsewhere and the two banks are filled by the USB host. Once the application
comes back to the USB driver, the two flags are set.
A status transaction is a special type of host to device transaction used only in a control transfer.
The control transfer must be performed using endpoints with no ping-pong attributes. According
to the control sequence (read or write), the USB device sends or receives a status transaction.
Data OUT 1
An interrupt is pending while the RX_DATA_BK0 or RX_DATA_BK1 flag is set.
ACK
PID
Read By Microcontroller
Set by USB Device,
Data Payload Written
in FIFO Endpoint Bank 1
Interrupt Pending
Microcontroller Reads Data 1 in Bank 0,
Host Sends Second Data Payload
Data OUT 1
Data OUT
PID
Write by USB Device
Data OUT 2
Data OUT 2
Cleared by Firmware
ACK
PID
Read By Microcontroller
Data OUT
Microcontroller Reads Data2 in Bank 1,
Host Sends Third Data Payload
PID
Interrupt Pending
Data OUT 2
AT91RM9200
Write In Progress
Cleared by Firmware
Data OUT 3
Data OUT 3
A
P
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