Datasheet

Electrical characteristics STM32L476xx
228/270 DS10198 Rev 8
Synchronous waveforms and timings
Figure 49 through Figure 52 represent synchronous waveforms and Table 113
through Table 116 provide the corresponding timings. The results shown in these
tables are obtained with the following FMC configuration:
• BurstAccessMode = FMC_BurstAccessMode_Enable
• MemoryType = FMC_MemoryType_CRAM
• WriteBurst = FMC_WriteBurst_Enable
• CLKDivision = 1
• DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM
Table 111. Asynchronous multiplexed PSRAM/NOR write timings
(1)(2)
1. CL = 30 pF.
2. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
w(NE)
FMC_NE low time 4T
HCLK
-0.5 4T
HCLK
+2
ns
t
v(NWE_NE)
FMC_NEx low to FMC_NWE low T
HCLK
-0.5 T
HCLK
+1
t
w(NWE)
FMC_NWE low time 2xT
HCLK
-1.5
2xT
HCLK
+1.
5
t
h(NE_NWE)
FMC_NWE high to FMC_NE high hold time T
HCLK
-0.5 -
t
v(A_NE)
FMC_NEx low to FMC_A valid - 3
t
v(NADV_NE)
FMC_NEx low to FMC_NADV low 0 1
t
w(NADV)
FMC_NADV low time T
HCLK
-0.5 T
HCLK
+1
t
h(AD_NADV)
FMC_AD(adress) valid hold time after
FMC_NADV high
T
HCLK
-2 -
t
h(A_NWE)
Address hold time after FMC_NWE high T
HCLK
-1 -
t
h(BL_NWE)
FMC_BL hold time after FMC_NWE high T
HCLK
+0.5 -
t
v(BL_NE)
FMC_NEx low to FMC_BL valid - 1.5
t
v(Data_NADV)
FMC_NADV high to Data valid - T
HCLK
+4
t
h(Data_NWE)
Data hold time after FMC_NWE high T
HCLK
+0.5 -
Table 112. Asynchronous multiplexed PSRAM/NOR write-NWAIT timings
(1)(2)
1. CL = 30 pF.
2. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
w(NE)
FMC_NE low time 9T
HCLK
-0.5 9T
HCLK
+2
ns
t
w(NWE)
FMC_NWE low time 7T
HCLK
-1.5 7T
HCLK
+1.5
t
su(NWAIT_NE)
FMC_NWAIT valid before FMC_NEx high 6T
HCLK
+2 -
t
h(NE_NWAIT)
FMC_NEx hold time after FMC_NWAIT invalid 4T
HCLK
-3 -
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