Datasheet

DS10969 Rev 5 177/204
STM32L475xx Electrical characteristics
190
Figure 32. SAI slave timing waveforms
SDMMC characteristics
Unless otherwise specified, the parameters given in Table 89 for SDIO are derived from
tests performed under the ambient temperature, f
PCLKx
frequency and V
DD
supply voltage
conditions summarized in
Table 23: General operating conditions, with the following
configuration:
• Output speed is set to OSPEEDRy[1:0] = 11
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5  V
DD
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output
characteristics.
Table 89. SD / MMC dynamic characteristics, V
DD
=2.7 V to 3.6 V
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode - 0 - 50 MHz
- SDIO_CK/fPCLK2 frequency ratio - - - 4/3 -
t
W(CKL)
Clock low time f
PP
= 50 MHz 8 10 - ns
t
W(CKH)
Clock high time f
PP
= 50 MHz 8 10 - ns
CMD, D inputs (referenced to CK) in MMC and SD HS mode
t
ISU
Input setup time HS f
PP
= 50 MHz 2 - - ns
t
IH
Input hold time HS f
PP
= 50 MHz 4.5 - - ns
CMD, D outputs (referenced to CK) in MMC and SD HS mode
t
OV
Output valid time HS f
PP
= 50 MHz - 12 14 ns
t
OH
Output hold time HS f
PP
= 50 MHz 9 - - ns
CMD, D inputs (referenced to CK) in SD default mode
t
ISUD
Input setup time SD f
PP
= 50 MHz 2 - - ns
t
IHD
Input hold time SD f
PP
= 50 MHz 4.5 - - ns
MS32772V1
SAI_SCK_X
SAI_FS_X
(input)
SAI_SD_X
(transmit)
t
su(FS)
Slot n
SAI_SD_X
(receive)
t
w(CKH_X)
t
h(FS)
Slot n+2
t
v(SD_ST)
t
h(SD_ST)
Slot n
t
su(SD_SR)
t
w(CKL_X)
t
h(SD_SR)
1/f
SCK
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