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STM32F427xx STM32F429xx Electrical characteristics
198
Figure 58. Asynchronous multiplexed PSRAM/NOR write waveforms
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Table 92. Asynchronous multiplexed PSRAM/NOR write timings
(1)(2)
Symbol Parameter Min Max Unit
t
w(NE)
FMC_NE low time 4T
HCLK
4T
HCLK
+0.5 ns
t
v(NWE_NE)
FMC_NEx low to FMC_NWE low T
HCLK
− 1T
HCLK
+0.5 ns
t
w(NWE)
FMC_NWE low time 2T
HCLK
2T
HCLK
+0.5 ns
t
h(NE_NWE)
FMC_NWE high to FMC_NE high hold time T
HCLK
-ns
t
v(A_NE)
FMC_NEx low to FMC_A valid - 0 ns
t
v(NADV_NE)
FMC_NEx low to FMC_NADV low 0.5 1 ns
t
w(NADV)
FMC_NADV low time T
HCLK
− 0.5 T
HCLK
+ 0.5 ns
t
h(AD_NADV)
FMC_AD(adress) valid hold time after FMC_NADV high) T
HCLK
− 2-ns
t
h(A_NWE)
Address hold time after FMC_NWE high T
HCLK
-ns
t
h(BL_NWE)
FMC_BL hold time after FMC_NWE high T
HCLK
− 2-ns
t
v(BL_NE)
FMC_NEx low to FMC_BL valid - 2 ns
t
v(Data_NADV)
FMC_NADV high to Data valid - T
HCLK
+1.5 ns
t
h(Data_NWE)
Data hold time after FMC_NWE high T
HCLK
+0.5 - ns
1. C
L
= 30 pF.
2. Guaranteed by characterization results.
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