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Black cat takes you to learn EMMC Protocol Part 10: EMMC read and write operation details (read & write)
2022-07-06 06:20:00 【Black cat senior】
This paper is based on eMMC JEDEC5.1 And personal work experience , If there is any mistake, please leave a message .
The article is painstakingly sorted out for individuals , Paid content , Unauthorized reprint .
The column where the article is located :《 Black cat takes you to learn :eMMC protocol 》
1 summary
1.1 What is a read-write operation
about emmc Come on , The most important operation , Just read and write . After all emmc It's a memory chip , Specifically used to access data , And storing data is right emmc Read and write .
for example , Save a photo emmc, This process is host Transfer data to emmc In the device , It is called a write operation . Empathy , Remove this photo from emmc out , The process is emmc Transfer data to host, Called read operation .
1.2 data bus
emmc There is 8 Data line , There are three bus options for data transmission :
1 Line (DATA0),4 Line (DATA0DATA3),8 Line (DATA0DATA7)
For each data line , Each clock cycle can transmit 1bit(single data rate) and 2bits(dual data rate) data .
1.3 Reading and writing classification
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