Datasheet

Electrical characteristics STM32H743xI
142/226 DocID030538 Rev 3
Synchronous waveforms and timings
Figure 26 through Figure 29 represent synchronous waveforms and Table 71 through
Table 74 provide the corresponding timings. The resu
lts shown in these tables are obtained
with the following FMC co
nfiguration:
• Bu
rstAccessMode = FMC_BurstAccessMode_Enable
• MemoryType = FMC_MemoryType_CRAM
• WriteBurst = FMC_WriteBurst_Enable
• CLKDivision = 1
• DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM
In all the timing tables, the
T
fmc_ker_ck
is the fmc_ker_ck clock period, with the following
FMC_CLK maximum values:
• For
2.7 V<V
DD
<3.6 V, FMC_CLK =133 MHz at 20 pF
• For 1.8 V<V
DD
<1.9 V, FMC_CLK =100 MHz at 20 pF
• For 1.62 V<V
DD
<1.8 V, FMC_CLK =100 MHz at 15 pF
Table 70. Asynchronous multiplexed PSRAM/NOR write-NWAIT timings
(1)
Symbol Parameter Min Max Unit
t
w(NE)
FMC_NE low time 9T
fmc_ker_ck
– 1 9T
fmc_ker_ck
ns
t
w(NWE)
FMC_NWE low time 7T
fmc_ker_ck
– 0.5 7T
fmc_ker_ck
+ 0.5
t
su(NWAIT_NE)
FMC_NWAIT valid before FMC_NEx high 6T
fmc_ker_ck
+ 3 -
t
h(NE_NWAIT)
FMC_NEx hold time after FMC_NWAIT invalid 4T
fmc_ker_ck
-
1. Guaranteed by characterization results.
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