EFM32WG Datasheet, PDF (187/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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Figure 14.24. EBI Alternative Memory Map (ALTMAP = 1)
0xffffffff
0xbfffffff
0 xc0 0 0 0 0 0 0
0xbfffffff
EBI Regions
0x80000000
0x7fffffff
EBI Region 3 (256 MB)
0xb0000000
0xafffffff
EBI Region 2 (256 MB)
0xa0000000
0x9fffffff
EBI Region 1 (256 MB)
0x90000000
0x8fffffff
EBI Region 0 (256 MB)
0x80000000
0x20000000
0x1fffffff
0x12000000
Co d e
0x00000000
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
14.3.13 WAIT/ARDY.
Some external devices are able to indicate that they are not finished with either write or read operation
by asserting the WAIT / ARDY line. This input signal is used to extend the REn/WEn cycles for slow
devices. The interpretation of the polarity of this signal can be configured with the ARDYPOL bit in
EBI_POLARITY. E.g. if the ARDYPOL is set to ACTIVELOW, then the REn/WEn cycle is extended
while the ARDY line is kept low. The ARDY functionality is enabled by setting the ARDYEN bit in the
EBI_CTRL register. It is also possible to enable a timeout check, which generates a bus error if the ARDY
is not deasserted within the timeout period. This prevents a system lock up condition in the case that the
external device does not deassert ARDY. The timeout functionality is disabled by setting ARDYTODIS
in the EBI_CTRL register.
When the ITS bitfield in the EBI_CTRL register is set to 0, the wait behavior defined in the ARDYEN and
ARDYTODIS bitfields applies to all 4 memory banks. When ITS is set to 1 each memory bank uses an
individual wait behavior definition. In this case bitfields ARDYEN and ARDYTODIS only apply to bank
0. Wait behavior for bank n is then defined in the ARDYnEN and ARDYTOnDIS bitfields.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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