Black cat takes you to learn EMMC Protocol Part 26: hardware reset operation of EMMC (h/w reset)

This paper is based on eMMC JEDEC5.1 And personal work experience , If there is any mistake, please leave a message .
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1 summary

 What is hardware reset ？
Hardware reset is to use a special hardware signal （ This signal is in RST_n This real physical line transmits ） take emmc Reset to pre-idle state, Instead of using cmd0 perhaps power cycle speak emmc Reset to pre-idle state.

 How to reset the hardware ？
1、 Set up RST_n_FUNCTION [162] by 1, send emmc Support hardware reset .

2、 The hardware reset should be pulled up at the beginning of power on , Then you can do other operations , Lower it for a period of time when it is necessary to reset （ This period of time is tRSTW, There are requirements during this period , It cannot be less than a certain value ）, Then pull it higher . Rising edge detected inside the device , Start the reset sequence .