You can see this model in GPG EMMC Box List. just Check is out
JTAG List
Let me post you clear pinout for you
image hosting 20mb
VREF = VCC
RESET = NRST = SYSRST
RTCK = TCK
Note: Also solder the VCC of JTAG cable to the device board. "
White"
color is VCC wire in GPG Jtag Cable as shown below:
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Good Luck!
BR
Dipendra Pathak