Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 798

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

Data IN Transfer for Endpoint with Two Banks

Data IN Followed By Status OUT Transfer at the End of a Control Transfer

: 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 TX_PK_RDY
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 Hardware

Set 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 IN

Data IN

Cleared by Hardware
switch to next bank 

Virtual TX_PK_RDY
bank 0
(UDPHS_EPTSTAx)

Token OUT

Data IN

Token IN

ACK

ACK

Data OUT (ZLP)

RX_BK_RDY
(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)