EFM32WG Datasheet, PDF (178/834 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 14.8. EBI Multiplexed 8-bit Data, 24-bit Address Write Operation
EBI_AD[ 15:8]
ADDRSETUP
(1, 2, 3, ...)
ADDRHOLD
(0, 1, 2, ...)
ADDR[ 23:16]
WRSETUP
(0, 1, 2, ...)
ADDR[ 7:0]
WRSTRB
(1, 2, 3, ...)
WRHOLD
(0, 1, 2, ...)
Z
EBI_AD[ 7:0]
ADDR[ 15:8]
DATA[ 7:0]
Z
EBI_ALE
EBI_CSn
EBI_WEn
14.3.4 Non-multiplexed 16-bit Data, N-bit Address Mode
In this non-multiplexed mode 16-bit data is driven on the 16 EBI_AD lines. The addresses are driven
on the EBI_A lines. The address space can be up to 256 MB as described in Section 14.3.6 (p. 180)
. This mode is set by programming the MODE field in the EBI_CTRL register to D16. Read and write
signals are shown in Figure 14.9 (p. 178) and Figure 14.10 (p. 178) respectively for the case in
which N address lines on EBI_A have been enabled.
Note
In this mode the 16-bit address is organized in 2-byte chunks at memory addresses aligned
to 2-byte offsets. Consequently, the LSB of the 16-bit address will always be 0. In order to
double the address space, the 16-bit address is internally shifted one bit to the right so that
the LSB of the address driven into the EBI_A bus, i.e. the EBI_A[0]-bit, corresponds to the
second least significant bit of the address, i.e. ADDR[1]. At the external device, the LSB of
the address must be tied either low or high in order to create a full address.
Figure 14.9. EBI Non-multiplexed 16-bit Data Read Operation with Extended Address
RDSETUP
(0, 1, 2, ...)
RDSTRB
(1, 2, 3, ...)
RDHOLD
(0, 1, 2, ...)
EBI_A[ N-1:0]
ADDR[ N:1]
Z
EBI_AD[ 15:0]
Z
DATA[ 15:0] Z
EBI_CSn
EBI_REn
Figure 14.10. EBI Non-multiplexed 16-bit Data Write Operation with Extended Address
WRSETUP
(0, 1, 2, ...)
WRSTRB
(1, 2, 3, ...)
WRHOLD
(0, 1, 2, ...)
EBI_A[ N-1:0]
ADDR[ N:1]
Z
EBI_AD[ 15:0]
DATA[ 15:0]
Z
EBI_CSn
EBI_WEn
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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