DocID13902 Rev 15 530/1128
RM0008 Flexible static memory controller (FSMC)
555
Figure 203. Synchronous multiplexed write mode - PSRAM (CRAM)
1. Memory must issue NWAIT signal one cycle in advance, accordingly WAITCFG must be programmed to 0.
2. NWAIT polarity is set to 0.
3. Byte Lane (NBL) outputs are not shown, they are held low while NEx is active.
!DDR;= DATA
ADDR;=
-EMORYTRANSACTIONBURSTOFHALFWORDS
(#,+
#,+
!;=
.%X
./%
.7%
(I:
.!$6
.7!)4
7!)4#&'
!$;=
CLOCK CLOCK
$!4,!4
INSERTEDWAITSTATE
AIF
#,+CYCLES
DATA
Table 127. FSMC_BCRx bit fields
Bit No. Bit name Value to set
31-20 Reserved 0x000
19 CBURSTRW 0x1
18-16 Reserved 0x0
15 ASCYCWAIT 0x0
14 EXTMOD 0x0
13 WAITEN Set to 1 if the memory supports this feature, otherwise keep at 0.
12 WREN 0x1
11 WAITCFG 0x0
10 WRAPMOD 0x0
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