Datasheet

833
SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
The size of the DPRAM is 4 Kbyte. 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 Section 37.6.8 ”UDPHS Endpoint Configuration Register”)
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 Kbyte logical
address space.
The physical block of DPR allocated for the endpoint is remapped all along the
64 Kbyte logical address space.
The application can write a
64 Kbyte buffer linearly.
Figure 37-5. Logical Address Space for DPR Access
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
64 KB
EP3
...
8 to 64 B
8 to 64 B
8 to 64 B
...
...
x banks
y banks
z banks
8 to1024 B
8 to1024 B
8 to1024 B