Information

DocID15818 Rev 11 135/178
STM32F20xxx Electrical characteristics
177
Synchronous waveforms and timings
Figure 60 through Figure 63 represent synchronous waveforms and Table 77 through
Table 79 provide the corresponding timings. The results shown in these tables are obtained
with the following FSMC configuration:
• BurstAccessMode = FSMC_BurstAccessMode_Enable;
• MemoryType = FSMC_MemoryType_CRAM;
• WriteBurst = FSMC_WriteBurst_Enable;
• CLKDivision = 1; (0 is not supported, see the STM32F20xxx/21xxx reference manual)
• DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM
In all timing tables, the
T
HCLK
is the HCLK clock period.
Figure 60. Synchronous multiplexed NOR/PSRAM read timings
FSMC_CLK
FSMC_NEx
FSMC_NADV
FSMC_A[25:16]
FSMC_NOE
FSMC_AD[15:0]
AD[15:0] D1 D2
FSMC_NWAIT
(WAITCFG = 1b, WAITPOL + 0b)
FSMC_NWAIT
(WAITCFG = 0b, WAITPOL + 0b)
t
w(CLK)
t
w(CLK)
Data latency = 0
BUSTURN = 0
t
d(CLKL-NExL)
t
d(CLKL-NExH)
t
d(CLKL-NADVL)
t
d(CLKL-AV)
t
d(CLKL-NADVH)
t
d(CLKL-AIV)
t
d(CLKH-NOEL)
t
d(CLKL-NOEH)
t
d(CLKL-ADV)
t
d(CLKL-ADIV)
t
su(ADV-CLKH)
t
h(CLKH-ADV)
t
su(ADV-CLKH)
t
h(CLKH-ADV)
t
su(NWAITV-CLKH)
t
h(CLKH-NWAITV)
t
su(NWAITV-CLKH)
t
h(CLKH-NWAITV)
t
su(NWAITV-CLKH)
t
h(CLKH-NWAITV)
ai14893h