Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet
Product codes
AT91SAM9X25-EK
543
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
Figure 32-9. Data IN Transfer for Endpoint with One Bank
Figure 32-10.Data IN Transfer for Endpoint with Two Banks
USB Bus
Packets
Packets
FIFO
Content
Content
TX_COMPLT Flag
(UDPHS_EPTSTAx)
(UDPHS_EPTSTAx)
TXRDY
Flag
(UDPHS_EPTSTAx)
Flag
(UDPHS_EPTSTAx)
Prevous Data IN TX
Microcontroller Loads Data in FIFO
Data is Sent on USB Bus
Interrupt Pending
Set by firmware
Cleared by hardware
Set by the firmware
Cleared by hardware
Interrupt Pending
Cleared by firmware
DPR access by firmware
DPR access by hardware
Cleared by firmware
Payload in FIFO
Set by hardware
Data IN 2
Token IN
NAK
ACK
Data IN 1
Token IN
Token IN
ACK
Data IN 1
Load in progress
Data IN 2
Read by USB Device
Read by UDPHS Device
FIFO
(DPR)
Bank 0
(DPR)
Bank 0
TX_COMPLT
Flag
(UDPHS_EPTSTAx)
Flag
(UDPHS_EPTSTAx)
Interrupt Cleared by Firmware
Virtual TXRDY
bank 1
(UDPHS_EPTSTAx)
bank 1
(UDPHS_EPTSTAx)
ACK
Token IN
ACK
Set by Firmware,
Data Payload Written in FIFO Bank 1
Data Payload Written in FIFO Bank 1
Cleared by Hardware
Data Payload Fully Transmitted
Data Payload Fully Transmitted
Token IN
USB Bus
Packets
Packets
Set by Hardware
Set by Hardware
Set by Firmware,
Data Payload Written
in FIFO Bank 0
Data Payload Written
in FIFO Bank 0
Written by
FIFO
(DPR)
Bank1
(DPR)
Bank1
Microcontroller
Written by
Microcontroller
Written by
Microcontroller
Microcontroller
Load Data IN Bank 0
Load Data IN Bank 0
Microcontroller Load Data IN Bank 1
UDPHS Device Send Bank 0
UDPHS Device Send Bank 0
Microcontroller Load Data IN Bank 0
UDPHS Device Send Bank 1
UDPHS Device Send Bank 1
Interrupt Pending
Data IN
Data IN
Cleared by Hardware
switch to next bank
switch to next bank
Virtual TXRDY
bank 0
(UDPHS_EPTSTAx)
bank 0
(UDPHS_EPTSTAx)