Atmel Evaluation Kit AT91SAM9X35-EK AT91SAM9X35-EK Data Sheet

508

SAM9X35 [DATASHEET]

11055E–ATARM–10-Mar-2014

The size of the DPRAM is 4

 

KB. The DPR is shared by all active endpoints. The memory size required by the active

endpoints must not exceed the size of the DPRAM.

SIZE_DPRAM = SIZE _EPT0 

+ NB_BANK_EPT1 x SIZE_EPT1

+ NB_BANK_EPT2 x SIZE_EPT2

+ NB_BANK_EPT3 x SIZE_EPT3

+ NB_BANK_EPT4 x SIZE_EPT4

+ NB_BANK_EPT5 x SIZE_EPT5

+ NB_BANK_EPT6 x SIZE_EPT6

+... (refer to 

If a user tries to configure endpoints with a size the sum of which is greater than the DPRAM, then the EPT_MAPD is not
set.

The application has access to the physical block of DPR reserved for the endpoint through a 64 KB logical address
space.

The physical block of DPR allocated for the endpoint is remapped all along the 64 KB logical address space. The
application can write a 64 KB buffer linearly. 

Configuration examples of UDPHS_EPTCTLx (

Bulk IN endpoint type follow below.



With DMA 



AUTO_VALID: Automatically validate the packet and switch to the next bank.



EPT_ENABL: Enable endpoint.



Without DMA:



TXRDY: An interrupt is generated after each transmission.



EPT_ENABL: Enable endpoint.

64 KB
EP0

64 KB
EP1

64 KB
EP2

DPR

Logical address

8 to 64 B

8 to1024 B

8 to1024 B

8 to1024 B

8 to1024 B

64 KB
EP3

...

8 to 64 B

...

1 bank

x banks

y banks

z banks

8 to1024 B
8 to1024 B
8 to1024 B