EFM32WG Datasheet, PDF (186/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

...the world's most energy friendly microcontrollers
MB bank can be accessed. From data space either four 64 MB banks (when ALTMAP bit is 0) or four
256 MB banks (when the ALTMAP bit is 1) can be accessed as shown in Figure 14.23 (p. 186) and
Figure 14.24 (p. 187) respectively.
The EBI regions starting at address 0x80000000 in the memory map of the EFM32WG can also be used
for code execution. When running code via EBI regions starting at this address, the Cortex-M4 uses
the System bus interface to fetch instructions. This results in reduced performance as the Cortex-M4
accesses stack, other data in SRAM and peripherals using the System bus interface. Code accesses
via the System bus interface will not be cached. Furthermore, it should be noted that the address area
from 0xA0000000 to 0xC0000000 is marked NX (no-execute) by default. To be able to run code via
the EBI efficiently, the EBI is also mapped in the code space at address 0x12000000. When running
code from this space, the Cortex-M4 fetches instructions through the I/D-Code bus interface, leaving
the System bus interface for data access. Instructions fetched via the I/D-Code bus interface can be
cached to increase performance. The EBI regions mapped into the code space can however only be
accessed by the CPU, i.e. not the DMA.
Depending on the setting of the ITS bitfield in the EBI_CTRL register. The external device behavior,
including for example data width, timing definitions, page mode operation, and pin polarities, is either
defined for all banks at once or individually per bank.
Figure 14.23. EBI Default Memory Map (ALTMAP = 0)
0xffffffff
0 xc0 0 0 0 0 0 0
0xbfffffff
EBI Regions
0x8fffffff
0x80000000
0x7fffffff
0x8fffffff
EBI Region 3 (64 MB)
0 x8 c0 0 0 0 0 0
0x8bffffff
EBI Region 2 (64 MB)
0x88000000
0x87ffffff
EBI Region 1 (64 MB)
0x84000000
0x83ffffff
EBI Region 0 (64 MB)
0x80000000
0x20000000
0x1fffffff
0x12000000
Co d e
0x00000000
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
0x1fffffff
EBI Region 3 (128 MB)
0x18000000
EBI
Re g i o n
2
(32
MB)
0x17ffffff
0x16000000
EBI
Re g i o n
1
(32
MB)
0x15ffffff
0x14000000
EBI
Re g i o n
0
(32
MB)
0x13ffffff
0x12000000
186
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