Table 54. Fmc_Bcrx Bit Fields; Table 55. Fmc_Btrx Bit Fields - ST STM32F446 Series Reference Manual

RM0390
The one HCLK cycle at the end of the write transaction helps guarantee the address and
data hold time after the NWE rising edge. Due to the presence of this HCLK cycle, the
DATAST value must be greater than zero (DATAST > 0).
Bit number
31:22
21
20
19
18:16
15
14
13
12
11
10
9
8
7
6
5:4
3:2
1
0
Bit number
31:30
29:28
27:24
23:20
19:16
15:8
7:4
3:0

Table 54. FMC_BCRx bit fields

Bit name
Reserved 0x000
WFDIS As needed
CCLKEN As needed
CBURSTRW 0x0 (no effect in asynchronous mode)
CPSIZE 0x0 (no effect in asynchronous mode)
ASYNCWAIT Set to 1 if the memory supports this feature. Otherwise keep at 0.
EXTMOD 0x0
WAITEN 0x0 (no effect in asynchronous mode)
WREN As needed
Reserved 0x0
Reserved 0x0
WAITPOL Meaningful only if bit 15 is 1
BURSTEN 0x0
Reserved 0x1
FACCEN Don't care
MWID As needed
MTYP As needed, exclude 0x2 (NOR Flash memory)
MUXE 0x0
MBKEN 0x1

Table 55. FMC_BTRx bit fields

Bit name
Reserved 0x0
ACCMOD Don't care
DATLAT Don't care
CLKDIV Don't care
BUSTURN Time between NEx high to NEx low (BUSTURN HCLK).
Duration of the second access phase (DATAST+1 HCLK cycles for
DATAST
write accesses, DATAST HCLK cycles for read accesses).
ADDHLD Don't care
Duration of the first access phase (ADDSET HCLK cycles).
ADDSET
Minimum value for ADDSET is 0.
RM0390 Rev 4
Flexible memory controller (FMC)
Value to set
Value to set
265/1328
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