Direst ISP jumper connection to emmc without socket.

[johnnybravo9889]

Hello Masters ,
Could you please take some of your valuable time to clarify my little doubt if possible ? I wanna know if i can connect an emmc directly via wires from its points on emmc to box for reprogramming purpose without emmc sockets ? Will it affect emmc or jtag by any means ? Please masters its my humble request to all to clarify this doubt .
Any kinda suggestion is highly appreciated , TY.

[backbiter17]

EMMc YES
UFS NO

wbr,A

[layder]

on this forum most people use the isp connection
below I will give you a quote from the software help file

================
eMMC ISP connection

ISP (In-System Programming) is*not documented connection for*eMMC at PCB. It use 1-dat line (1bit) mode for*transder data between eMMC and box. ISP mode connection use CLK, CMD, DAT_0 (Data zero), GND wires and VCC, VCCQ power wires for eMMC.



Some devices have pads for CLK/CMD/Dat_0 signals*on PCB. But mist devices not have pads, and some devices have no wires for these signals of PCB*top layer (wires are placed at internal PCB layer).



There are 2*types of ISP*eMMC connection:

- Normal mode*
- HiPower CLK*(tm) mode

Normal mode:
At Normal mode ISP MMC connection need use this pins:

- GND
- CMD
- CLK
- DAT0
- VCC
- VCCQ


Device board have no power from USB charger or*battery. Power to eMMC is external (VCC, VCCQ wires) and provide from EasyJTAG Plus box or from third-party power adapder for EasyJTAG 1st generation box.



Some devices need use Pull-UP resistors for DAT0/CMD lines (100-200 ohms)


For best ISP connection relults EasyJTAG Plus box (with box firmware*v2.53+) allow use different VIO levels voltages: 1,8/2.0/2.2/2,4/2.6/2.8/3.0/3.3v


HiPower CLK (tm) mode:

Device board get power from USB charger or*together USB/battеry.*
- VCC/VCCQ wires are*not connected at this mode.*
- At software must be set "HiPowerCLK mode" checkbox.
- For*EasyJTAG 1st generation box*need use special 4pins CLK adapter.


HiPowerCLK mode is the best solution for most new devices.

At HiPowerCLK mode ISP eMMC connection need use only this pins:

- GND
- CMD
- CLK
- DAT0

Important requirements that must be met for a quality ISP connection:
- GND wire should be much thicker compared to others
- the length of all wires must be same
- the length of all wires should be kept to a minimum. Best length*is 5-10 centimeters


CLK clock at ISP mode*determines the data trarsfer*speed beetwin eMMC and box. If the above requirements are met, the stability of operation is ensured at frequencies up to 24-36MHz. The best performance is from 14-24MHz. There is no need to use lower frequencies.*

To increase the stability of operation at 36MHz, it is advisable to modify the adapters by soldering a resistor with a resistance of 10-33*ohms into the gap of the CLK track

[johnnybravo9889]

Thank you lord layder for looking into my matter but i didnt get to know i wanted , maybe i couldnt clarify things , sorry i m noob in emmc topics :-( .
Suppose a phone which doesnt have isp pinout on its pcb and i take out its emmc from the board , the fact i wanted to know is that whether if i connect the wires to the emmc pinout directly will it work or not as i am tight on budget and cannot buy the 13 in 1 emmc adapter at the moment.
Any kinda suggestion is highly appreciated , TY.

[layder]

Originally Posted by johnnybravo9889

i wanted to know is that whether if i connect the wires to the emmc pinout directly will it work or not as i am tight on budget and cannot buy the 13 in 1 emmc adapter at the moment.
Any kinda suggestion is highly appreciated , TY.

usially - yes, but some IC (Hynix, Toshiba) also need solder 1uF capacitor from Vddi pin to GND


for UFS chips this method not good

UFS chips need make many GND/Vcc/Vccq/Vvq2 and 3 Vddi capacitor connection.

[SAJONDUTTA]

Originally Posted by layder

usially - yes, but some ic (hynix, toshiba) also need solder 1uf capacitor from vddi pin to gnd


for ufs chips this method not good

ufs chips need make many gnd/vcc/vccq/vvq2 and 3 vddi capacitor connection.

Plz diagrame sir..............

[layder]

Originally Posted by SAJONDUTTA

Plz diagrame sir..............

Solder all GND, all VCC, all VCCQ, all VCCQ2 pins if ufs not connect, and 3 Vddi capacitor from datashet of this chip - thas is a solution

We are released sockets for fast connect UFS chips.
If you want solder wires - please do not create topics - "it not work"

ISP - for UFS at PCB, with no guarantee

we are is guarantee only socket connection

[oktay50000]

Originally Posted by SAJONDUTTA

Plz diagrame sir..............

Just buy the adaptor man