AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 843

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

Figure 38-13. Data OUT Transfer for Endpoint with One Bank
843
USB Bus
Packets
RX_BK_RDY
(UDPHS_EPTSTAx)
FIFO (DPR)
Content
AT91SAM9G45
Token OUT
Host Sends Data Payload
Written by UDPHS Device
Data OUT 1
Data OUT 1
For OUT transfer, the bank will be automatically cleared by hardware when the application has
read all the bytes in the bank (the bank is empty).
Note: When a zero-length-packet is received, RX_BK_RDY bit in UDPHS_EPTSTAx is cleared
automatically by AUTO_VALID, and the application knows of the end of buffer by the presence
of the END_TR_IT.
Note: If the host sends a zero-length packet, and the endpoint is free, then the device sends an
ACK. No data is written in the endpoint, the RX_BY_RDY interrupt is generated, and the
BYTE_COUNT field in UDPHS_EPTSTAx is null.
– END_BUFFIT: Generate an interrupt when BUFF_COUNT in the
– END_TR_EN: End of transfer enable, the UDPHS device can put an end to the
– END_TR_IT: End of transfer interrupt enable, an interrupt is sent after the last USB
– CHANN_ENB: Run and stop at end of buffer.
UDPHS_DMASTATUSx register reaches 0.
current DMA transfer, in case of a short packet.
packet has been transferred by the DMA, if the USB transfer ended with a short
packet. (Beneficial when the receive size is unknown.)
Host Sends the Next Data Payload
ACK
Microcontroller Read
Set by Hardware
Microcontroller Transfers Data
Data OUT 1
Token OUT
Interrupt Pending
Data OUT 2
NAK
Cleared by Firmware,
Data Payload Written in FIFO
Token OUT
Host Resends the Next Data Payload
Written by UDPHS Device
Data OUT 2
Data OUT 2
6438F–ATARM–21-Jun-10
ACK