Datasheet

Electrical characteristics STM32L476xx
216/270 DS10198 Rev 8
Figure 41. SAI slave timing waveforms
SDMMC characteristics
Unless otherwise specified, the parameters given in Table 100 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 100. 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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