eMMC life time

1.DEVICE_LIFE_TIME_EST_TYP_A 和DEVICE_LIFE_TIME_EST_TYP_B的区别

Device Health is similar to SMART features of modern hard disks, it provides only vital NAND
flash program/erase cycles information in percentage of useful flash life span.
The host can query Device Health information utilizing standard MMC command, to get the
extended CSD structure:
 DEVICE_LIFE_TIME_EST_TYP_A[268], The host may use it to query SLC device health
information
 DEVICE_LIFE_TIME_EST_TYP_B[269], The host may use it to query MLC device health
information
The device health feature will provide a % of the wear of the device in 10% fragments.