RIFF Box v1/v2 solution for CLK line problem - GSM-Forum

Pijush Das · 10-16-2019, 22:48

Hi,
As many of users faced problems with CLK line, for which solution was to remove CLK resistor between CPU and eMMC chip on target board, here is simple solution to overcome this problem:

For RIFF Box v1 (black box):

- Add pull up resistor from VCCQ (1.8v) to CLK line

Value starting from 4.7K (worked on qualcomm) down to 200 Ohms (for some MTK). Its better to start from 4.7K and test with decreasing value until successful connection is established.

Modification for v2 box requires connecting additional components, and full instructions with diagram will be posted soon.

If anyone needs urgent help, please ask on RIFF Box Viber community group.

Pijush Das · 10-16-2019, 23:34

OPPO A5s CPH1909 (MTK) Successfully Connected via ISP without Removing CLK Resistor...

By @PIJUSH..

NOTE: Full Instructions with Diagram will be Posted SOON.

10-16-2019, 22:48	#1 (permalink)
Pijush Das Product Supporter Join Date: Mar 2013 Location: JTAG/eMMC/UFS Posts: 892 Member: 1902789 Status: Offline Thanks Meter: 1,100	RIFF Box v1/v2 solution for CLK line problem Hi, As many of users faced problems with CLK line, for which solution was to remove CLK resistor between CPU and eMMC chip on target board, here is simple solution to overcome this problem: For RIFF Box v1 (black box): - Add pull up resistor from VCCQ (1.8v) to CLK line Value starting from 4.7K (worked on qualcomm) down to 200 Ohms (for some MTK). Its better to start from 4.7K and test with decreasing value until successful connection is established. Modification for v2 box requires connecting additional components, and full instructions with diagram will be posted soon. If anyone needs urgent help, please ask on RIFF Box Viber community group.

10-16-2019, 23:34	#2 (permalink)
Pijush Das Product Supporter Join Date: Mar 2013 Location: JTAG/eMMC/UFS Posts: 892 Member: 1902789 Status: Offline Thanks Meter: 1,100	OPPO A5s CPH1909 (MTK) TEST DONE... OPPO A5s CPH1909 (MTK) Successfully Connected via ISP without Removing CLK Resistor... By @PIJUSH.. NOTE: Full Instructions with Diagram will be Posted SOON.