ST STM32G4 Series Reference Manual page 509

RM0440
18.5.6 NOR/PSRAM controller registers
SRAM/NOR-Flash chip-select control register for bank x (FMC_BCRx) (x = 1 to
4)
Address offset: 8 * (x – 1), (x = 1 to 4)
Reset value: Bank 1: 0x0000 30DB
Reset value: Bank 2: 0x0000 30D2
Reset value: Bank 3: 0x0000 30D2
Reset value: Bank 4: 0x0000 30D2
This register contains the control information of each memory bank, used for SRAMs,
PSRAM, FRAM and NOR Flash memories.
31 30 29
Res. Res. Res.
15 14 13
ASYNC EXT WAIT
WREN
WAIT MOD EN
rw rw rw
Bits 31:24 Reserved, must be kept at reset value.
Bits 23:22 NBLSET[1:0]: Byte lane (NBL) SETUP
These bits configure the NBL setup timing from NBLx low to chip select NEx low.
00: NBL setup time is 0 AHB clock cycle
01: NBL setup time is 1 AHB clock cycle
10: NBL setup time is 2 AHB clock cycles
11: NBL setup time is 3 AHB clock cycles
Bit 21 WFDIS: Write FIFO Disable
This bit disables the Write FIFO used by the FMC controller.
0: Write FIFO enabled (Default after reset)
1: Write FIFO disabled
Note: The WFDIS bit of the FMC_BCR2..4 registers is don't care. It is only enabled through the
FMC_BCR1 register.
28 27 26 25
Res. Res. Res. Res.
12 11 10 9
WAIT WAIT
Res.
CFG POL
rw rw rw
24 23 22
Res. NBLSET[1:0] WFDIS
rw rw
8 7 6
BURST FACC
Res.
EN EN
rw rw
RM0440 Rev 1
Flexible memory controller (FMC)
21 20 19 18
CCLK CBURST
EN RW
rw rw rw rw
5 4 3 2
MWID[1:0] MTYP[1:0]
rw rw rw rw
17 16
CPSIZE[2:0]
rw rw
1 0
MUX MBK
EN EN
rw rw
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