Datasheet

515
SAM9X35 [DATASHEET]
11055E–ATARM–10-Mar-2014
Figure 32-10.Data IN Transfer for Endpoint with Two Banks
Figure 32-11.Data IN Followed By Status OUT Transfer at the End of a Control Transfer
Note: A NAK handshake is always generated at the first status stage token.
Read by USB Device
Read by UDPHS Device
FIFO
(DPR)
Bank 0
TX_COMPLT
Flag
(UDPHS_EPTSTAx)
Interrupt Cleared by Firmware
Virtual TXRDY
bank 1
(UDPHS_EPTSTAx)
ACK Token IN ACK
Set by Firmware,
Data Payload Written in FIFO Bank 1
Cleared by Hardware
Data Payload Fully Transmitted
Token IN
USB Bus
Packets
Set by HardwareSet by Hardware
Set by Firmware,
Data Payload Written
in FIFO Bank 0
Written by
FIFO
(DPR)
Bank1
Microcontroller
Written by
Microcontroller
Written by
Microcontroller
Microcontroller
Load Data IN Bank 0
Microcontroller Load Data IN Bank 1
UDPHS Device Send Bank 0
Microcontroller Load Data IN Bank 0
UDPHS Device Send Bank 1
Interrupt Pending
Data INData IN
Cleared by Hardware
switch to next bank
Virtual TXRDY
bank 0
(UDPHS_EPTSTAx)
Token OUT
Data IN
Token IN
ACK
ACK
Data OUT (ZLP)
RXRDY
(UDPHS_EPTSTAx)
TX_COMPLT
(UDPHS_EPTSTAx)
Set by Hardware
Set by Hardware
USB Bus
Packets
Cleared by Firmware
Cleared by Firmware
Device Sends a
Status OUT to Host
Device Sends the Last
Data Payload to Host
Interrupt
Pending
Token OUT
ACK
Data OUT (ZLP)