Datasheet

507
SAM9G15 [DATASHEET]
11052D–ATARM–31-Oct-12
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 32.7.8 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 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.
Figure 32-5. 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 B8 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