STM32L4P5CE datasheet(275/311 Pages) STMICROELECTRONICS

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DS12903 Rev 2

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STM32L4P5xx

Electrical characteristics

277

6.3.33

SD/SDIO/MMC card host interfaces (SDMMC)

Unless otherwise specified, the parameters given in Table 122 for SDIO are derived from

tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage

conditions summarized in Table 21: 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 x VDD Refer to Section 6.3.14: I/O

port characteristics for more details on the input/output characteristics.

Table 122. Dynamics characteristics:

SD / eMMC characteristics at VDD = 2.7 V to 3.6 V (1)

1. Guaranteed by characterization results.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPP

Clock frequency in data transfer

mode

-0

MHz

SDIO_CK/fPCLK2 frequency

ratio

8/3

tW(CKL)

Clock low time

fpp = 52 MHz

8.5

9.5

tW(CKH)

Clock high time

fpp = 52 MHz

8.5

9.5

CMD, D inputs (referenced to CK) in eMMC legacy/SDR/DDR and SD HS/SDR(2)/DDR(2) mode

2. For SD 1.8 V support, an external voltage converter is needed.

tISU

Input setup time HS

1.5

tIHD

Input hold time HS

2.0

CMD, D outputs (referenced to CK) in eMMC legacy/SDR/DDR and SD HS/SDR(2)/DDR(2) mode

tOV

Output valid time HS

5.5

tOH

Output hold time HS

CMD, D inputs (referenced to CK) in SD default mode

tISUD

Input setup time SD

0.5

tIHD

Input hold time SD

1.5

CMD, D outputs (referenced to CK) in SD default mode

tOVD

Output valid default time SD

tOHD

Output hold default time SD

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