Samsung S3C2451X User Manual page 530

HSMMC CONTROLLER
Note : Ensure to always set SDCLK Hold Enable (EnSCHold) if the card does not support Read Wait to
guarantee for Receive data not overwritten to the internal FIFO memory.
Note : CMD_wo_DAT issue is prohibited during READ transfer when SDCLK Hold Enable is set
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
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Specifications and information herein are subject to change without notice.
S3C2451X RISC MICROPROCESSOR