20.4 SDHC blocked after switch from high-speed mode

If the current speed mode is Default Speed or SDR12, the SDCLK frequency must be higher than 25 MHz before switching to another mode, otherwise SDHC is blocked.

Work Around

Set the SDCLK frequency to a value higher than 25 MHz before switching to another mode.

Affected Silicon Revisions


A0	A1	A1-D1G	A1-D2G
X	X	X	X

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