s25fl256 flash ic

Here we discuss the JTAG on platforms. CPU,CPLD etc.
usbbdm
Junior Member
Posts: 8719
Joined: Mon Jul 18, 2005 9:33 pm

Post by usbbdm »

Finally I found why NT cannot erase the flash. It is related to the power supply of NT (I am using power from NT).
If I connect a 12ohm resistor from power on NT to the VCC on the flash, I can erase the flash without any issue.
I looked at the datasheet, when erase a flash it might draw max 100mA from the power. Without resistor, I think the power to the flash is not stable.
Anyway, no need to release another version to program this chip.
Simple solution is to use a small resistor. I even put a multi meter between (20 am current) and it also works.
I found only need to use it when erase. When program it is not needed.

[Edit]
Final working resistor value for erase and write is 6ohm.
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