Reading the Jz4720 chip, I can see that all GPIOs have an internal Pull-up resistor enabled at reset.

So, We need probe some Resistor values, if with a 330 resistor from KIN3 to GROUND the processor enter in USB mode, you can try with 2k, 10k, etc


Carlos


On Thu, Aug 27, 2009 at 10:51 AM, Carlos Camargo <cicamargoba@gmail.com> wrote:
Hi

I'm testing in my board some resistors, with 1.8k form GND to Bootsel1 and a pull up 47k resistor the processor can enter to usb mode. So, I think that the problem is with the GPIO value at reset.




On Thu, Aug 27, 2009 at 10:03 AM, Carlos Camargo <cicamargoba@gmail.com> wrote:
With the 330 resistor, the CPU enter in USB mode?




On Thu, Aug 27, 2009 at 9:29 AM, Adam Wang <adam@qi-hardware.com> wrote:
Hi Carlos,


This board have a Reset S1, What happen when you press  the U key and push the reset?


Still enter NAND boot mode.

Does cpu work on those KEYOUT1~7 and KEYIN1~7 as default "high" status before it starts to run codes to initial those pins, no matter either nand or usb?


sorry, I don't know
 

Adam

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Carlos



--
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba@unal.edu.co



--
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba@unal.edu.co



--
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba@unal.edu.co