Flexible static memory controller (FSMC) RM0402
254/1163 RM0402 Rev 6
Table 49. NOR Flash/PSRAM: example of supported memories
and transactions
Device Mode R/W
AHB
data
size
Memory
data size
Allowed/
not
allowed
Comments
NOR Flash
(muxed I/Os
and nonmuxed
I/Os)
Asynchronous R 8 16 Y -
Asynchronous W 8 16 N -
Asynchronous R 16 16 Y -
Asynchronous W 16 16 Y -
Asynchronous R 32 16 Y Split into 2 FSMC accesses
Asynchronous W 32 16 Y Split into 2 FSMC accesses
Asynchronous
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R - 16 N Mode is not supported
Synchronous R 8 16 N -
Synchronous R 16 16 Y -
Synchronous R 32 16 Y -
PSRAM
(multiplexed
I/Os and non-
multiplexed
I/Os)
Asynchronous R 8 16 Y -
Asynchronous W 8 16 Y Use of byte lanes NBL[1:0]
Asynchronous R 16 16 Y -
Asynchronous W 16 16 Y -
Asynchronous R 32 16 Y Split into 2 FSMC accesses
Asynchronous W 32 16 Y Split into 2 FSMC accesses
Asynchronous
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R - 16 N Mode is not supported
Synchronous R 8 16 N -
Synchronous R 16 16 Y -
Synchronous R 32 16 Y -
Synchronous W 8 16 Y Use of byte lanes NBL[1:0]
Synchronous W 16/32 16 Y -
SRAM and
ROM
Asynchronous R 8 / 16 16 Y -
Asynchronous W 8 / 16 16 Y Use of byte lanes NBL[1:0]
Asynchronous R 32 16 Y Split into 2 FSMC accesses
Asynchronous W 32 16 Y
Split into 2 FSMC accesses
Use of byte lanes NBL[1:0]
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