#EMMC
@Emmcmobilerepairing
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@EEVblog
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#EMMCJtag
Here I can discuss the basic topic of emmc programming,how can we manage and solve the issue and problems when our main board fails to starts normally,
We see some times main board emmc files goes bad due to install wrong Firmware by mistake, and Mainboard goes in Stby mode
Red light or some time No red light
New Firmware stops in between when installation process running due to power failure .( Stby mode )
Stops himself main board power supply accidentally during firmware installation ..
Red Light Stby mode,No Red Light some times.
Here I can explain you what kind of connection of RT809H programmer we need to install emmc files as we call
(JTAG) Programming
For JTAG a board we need these emmc
Connection
Note (Connection wires should not be long)
D0 CMD CLK VCCQ VCC GND
VCC is 3.3V Emmc Chip main supply
VCCQ is 1.8V also for emmc chip 2nd supply.
Crystal two points short with common Ground connection.
....................
Now Connect
D0 CMD CLK
VCCQ VCC GND Main board JTAG Points to Programmer as seen in this picture
Now when connect these connections
Open Your RT809H Program On Your Laptop.
Supply your Mother board on.
Select option EMMC Auto ISP
OK
Emmc Auto
Select Settings N option
EMMC Chart will open
Select Option
User
Boot1
Boot2
EXD_CSD
1.8V or 3.3V as per emmc required
Than Press OK
Now from left side Ist option
Press Read your Chip
It's should read your chip untill it's read full don't stop when it's complete save your emmc chip file in any folder you like to save .
Write Your emmc Chip
Select your emmc new file for writing on main board emmc chip
For Writing files on your emmc chip
Select Left Side 4th option Write ✍️
It's takes its time
Note : Always use Laptop when you program emmc chip because
CLK CMD D0 is High Frequency Signals and data line.
After Successful installation
Power off your main board and remove
All connections on main board .
Enjoy .
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EMMC Jtag Method How to Read and write EMMC with RT809H Programming Device