u012497906的专栏

TRIM: A command that removes data from a write group. When TRIM is executed the region shall read as ‘0’. This serves primarily as a data removal command. (See Discard for performance command) Tuning Process: A process commonly done by the host to find

Tuning flow based on CMD21 (eMMC) or CMD19 (SD)SD 4.2 and eMMMC 5.1 protocols and both these protocols have speedmodes in which the incoming data must be sampled on a clock with a programmable sampling由于芯片制造工艺、PCB 走线、电压、温度等因素的影响，数据信号从 eMMC Device 到达 Host