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Electrical characteristics STM32F765xx STM32F767xx STM32F768Ax STM32F769xx
208/255 DocID029041 Rev 6
SDRAM waveforms and timings
• CL = 30 pF on data and address lines. CL = 10 pF on FMC_SDCLK unless otherwise
specified.
In all timing tables, the T
HCLK
is the HCLK clock period.
–For 3.0 V≤ V
DD
≤ 3.6 V, maximum FMC_SDCLK = 100 MHz at CL=20 pF (on FMC_SDCLK).
–For 2.7 V≤ V
DD
≤ 3.6 V, maximum FMC_SDCLK = 90 MHz at CL=30 pF (on FMC_SDCLK).
–For 1.71 V≤ V
DD
<1.9 V, maximum FMC_SDCLK = 70 MHz at CL=10 pF (on FMC_SDCLK).
Figure 74. SDRAM read access waveforms (CL = 1)
Table 114. Switching characteristics for NAND Flash write cycles
(1)
1. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
w(NWE)
FMC_NWE low width 4T
HCLK
− 0.5 4T
HCLK
+ 0.5
ns
t
v(NWE-D)
FMC_NWE low to FMC_D[15-0] valid 0 -
t
h(NWE-D)
FMC_NWE high to FMC_D[15-0] invalid 2T
HCLK
− 1-
t
d(D-NWE)
FMC_D[15-0] valid before FMC_NWE high 5T
HCLK
− 1-
t
d(ALE-NWE)
FMC_ALE valid before FMC_NWE low - 3T
HCLK
+ 1
t
h(NWE-ALE)
FMC_NWE high to FMC_ALE invalid 2T
HCLK
− 2-
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