CMD reason time out - GSM-Forum

Deni's · 06-10-2019, 09:11

i want to repair G900F but always get error like this..

Z3X EasyJtag Software ver. 3.6.1.0
Loading eMMC GEN1 Firmware... IO: 1850 mV
Box S/N: 0F01300C22E581EB, ,FW Ver.: 01.63
Warning: CMD Pullup Level (237 mV) too low , check cables etc.!
CMD Active Level:742 mV
Box IO Level:1850 mV
CLK Rate:21000 kHz
Bus Width:1bit,SDR
HiPower mode is ON!
Can't init device, Reason: CMD Timeout Error
Done.

umar342 · 06-10-2019, 17:23

If CMD Pullup Level is underestimated ( 500-800mV ), it usually means that there are no PullUp resistors between the CMD line and VCCQ in the eMMC connection interface, and this means that errors of detection or operation with eMMC are possible.
If CMD Pullup Level is greatly underestimated ( 100-300mV ), it most likely means that the CMD line is shorted to ground.

umar342 · 06-10-2019, 17:44

Quote:

Originally Posted by umar342

If CMD Pullup Level is underestimated ( 500-800mV ), it usually means that there are no PullUp resistors between the CMD line and VCCQ in the eMMC connection interface, and this means that errors of detection or operation with eMMC are possible.
If CMD Pullup Level is greatly underestimated ( 100-300mV ), it most likely means that the CMD line is shorted to ground.

CMD Pullup Level: - The signal level that the chip gives out.

06-10-2019, 09:11	#1 (permalink)
Deni's No Life Poster Join Date: Aug 2012 Location: Bali-Indonesia Posts: 2,908 Member: 1800628 Status: Offline Thanks Meter: 940	CMD reason time out i want to repair G900F but always get error like this.. Z3X EasyJtag Software ver. 3.6.1.0 Loading eMMC GEN1 Firmware... IO: 1850 mV Box S/N: 0F01300C22E581EB, ,FW Ver.: 01.63 Warning: CMD Pullup Level (237 mV) too low , check cables etc.! CMD Active Level:742 mV Box IO Level:1850 mV CLK Rate:21000 kHz Bus Width:1bit,SDR HiPower mode is ON! Can't init device, Reason: CMD Timeout Error Done.

06-10-2019, 17:23	#2 (permalink)
umar342 No Life Poster Join Date: Feb 2010 Location: india Posts: 1,085 Member: 1246696 Status: Offline Sonork: 100.1681950 Thanks Meter: 650	If CMD Pullup Level is underestimated ( 500-800mV ), it usually means that there are no PullUp resistors between the CMD line and VCCQ in the eMMC connection interface, and this means that errors of detection or operation with eMMC are possible. If CMD Pullup Level is greatly underestimated ( 100-300mV ), it most likely means that the CMD line is shorted to ground.