Datasheet

DocID024030 Rev 10 193/239
STM32F427xx STM32F429xx Electrical characteristics
198
Table 104. SDRAM write timings
(1)(2)
1. CL = 30 pF on data and address lines. CL=15pF on FMC_SDCLK.
2. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
w(SDCLK)
FMC_SDCLK period 2T
HCLK
− 0.5 2T
HCLK
+0.5
ns
t
d(SDCLKL _Data
) Data output valid time - 3.5
t
h(SDCLKL _Data)
Data output hold time 0 -
t
d(SDCLKL_Add)
Address valid time - 1.5
t
d(SDCLKL_SDNWE)
SDNWE valid time - 1
t
h(SDCLKL_SDNWE)
SDNWE hold time 0 -
t
d(SDCLKL_ SDNE)
Chip select valid time - 0.5
t
h(SDCLKL-_SDNE)
Chip select hold time 0 -
t
d(SDCLKL_SDNRAS)
SDNRAS valid time - 2
t
h(SDCLKL_SDNRAS)
SDNRAS hold time 0 -
t
d(SDCLKL_SDNCAS)
SDNCAS valid time - 0.5
t
d(SDCLKL_SDNCAS)
SDNCAS hold time 0 -
t
d(SDCLKL_NBL)
NBL valid time - 0.5
t
h(SDCLKL_NBL)
NBLoutput time 0 -
Table 105. LPSDR SDRAM write timings
(1)(2)
1. CL = 10 pF.
2. Guaranteed by characterization results.
Symbol Parameter Min Max Unit
t
w(SDCLK)
FMC_SDCLK period 2T
HCLK
− 0.5 2T
HCLK
+0.5
ns
t
d(SDCLKL _Data
) Data output valid time - 5
t
h(SDCLKL _Data)
Data output hold time 2 -
t
d(SDCLKL_Add)
Address valid time - 2.8
t
d(SDCLKL-SDNWE)
SDNWE valid time - 2
t
h(SDCLKL-SDNWE)
SDNWE hold time 1 -
t
d(SDCLKL- SDNE)
Chip select valid time - 1.5
t
h(SDCLKL- SDNE)
Chip select hold time 1 -
t
d(SDCLKL-SDNRAS)
SDNRAS valid time - 1.5
t
h(SDCLKL-SDNRAS)
SDNRAS hold time 1.5 -
t
d(SDCLKL-SDNCAS)
SDNCAS valid time - 1.5
t
d(SDCLKL-SDNCAS)
SDNCAS hold time 1.5 -
t
d(SDCLKL_NBL)
NBL valid time - 1.5
t
h(SDCLKL-NBL)
NBL output time 1.5 -
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