Data Sheet

1.3 Wear-leveling
This function means the data are no longer tied to a single physical area, which can extend Card’s life
expectancy.
1.4 Early move
The function provides a mechanism to avoid read disturbance. Built-in ECC is used to detect and correct data bit
error. If error bits reaches the default threshold, the data will be moved to another good block to avoid
un-correct error in advance.
1.5 Read Retry
The function allows the read voltage to be dynamically adjusted such that read errors are decreased or even
eliminated.
2.Bus Topology
The SD Memory Card system defines two alternative communication protocols: SD and SPI. The host system
can choose either one of modes. The card detects which mode is request by host when the reset command is
received and expects all further communication to be in the same communication mode.
2.1 SD Bus
For more details, refer to Section 3.5.1 of the SDA Physical Layer Specification, Version 5.1
2.2 SPI Bus
For more details, refer to Section 3.5.2 of the SDA Physical Layer Specification, Version 5.1