Dear sir,

When I connect my cy7c68013a board to PC, the device manager displayed "unknown device". 

The configuation of cy7c68013a is as  follows:

1.The cystal frequency is 24.5760Mhz, I use 22pf capactor connect to each pin of cystal.

2.wakeup pin is connected to 3.3V via 10k resistor

3.reset pin is connected to 3.3V with 10k resistor and with 10uf capacitor to GND。

4.reserved pin is connected GND with 10k resistor

5.SCL and SDA pulled up using 2.2k resistor

6.BKPT is connected to GND with 1k resistor and a led

7.EEPROM is not connected to cy7c68013a, I removed the jumper on SDA line.

I modified the cysub.inf and tried to load the cyusb.sys manually, but an err message showed up "指定的位置不包含有关硬件的信息".

please please help me~!

Please look at http://www.cypress.com/?docID=30633 for the schematic review checklist.

Before going deeper, the first thing I would check is the crystal. It seems it does not meet the device specification.

What is the VID/PID shown in device manager (Right click -> properties -> details -> hardware id)?

Regards,

Anand

vid/pid shown in device manager is 0000/0000

That means the device is not even enumerating properly. Modifying the inf file will not help. It is most probably a hardware issue. Please go through the schematic review checklist, that should help.

Regards,

Anand

Hi Anand,

I hope that you can help me too.

My device is known to work perfectly at a common PC.

But attached to a laptop/notebook I observe the following behaviour:

At power up, the device can not be recognized and shows vid_0000&pid_0000 in the device manager. After a few moments the device can be perfectly recognized as soon as I unplug and re-plug the USB cable.

I figured a lack of power provided by the laptop internal USB Hub and used a powered ext. USB hub, but the situation remains.

Since I do not observe this issue on a normal PC (with the identical USB controller device) I aussume a kind of timing problem.

Do you have any idea how I can solve this, because daily replugging is not an option.

(If you want to ask for scematic, I can already answer, that I ca not easily support this, since it is somehow confidential. Important to me is the fact, that it never showed to be an issue on normal PC's.)

Thanks in advance!

Regards

KOP

I think you got at least two problems:

1. The crystal MUST be a 24.000MHz crystal at fundamental mode, no 24.576MHz!

2. The reset circuit is wrong. 10uF results in a reset time which is much to long for usb bus powered designs. The device has to answer the host requests within 100ms after plug-in. Take a look into this: http://www.cypress.com/?rID=12959

3. Connect the reserved pin directly to GND for proper operation.

Please follow the suggestions of Chris R.

Since confidentiality is a concern, if you are still not able to resolve the issue then please create a tech support case (MyAccount -> MyCases) so that one of our engineers can review your schematic.

Regards,

Anand

Hi Chris R. and Anand,

thanks already, I will chekc your proposals and let you know my findings.

Regards,

KOP

 Hi Anand and Chris,

I have a similar probelm.

I have the cy7c68013a-56lfxc on one of our eval board and it used to communicate as expected. We have several flavours of the eval board using the same IC. I changed the board I was using and when I came back to this board my computer cannot recognise the device any more. It cannot recognize it on any of our eval board for that matter. I see an unknown device in the control panel.

It gets recognised and works as expected on a different computer and I have prolems on only 1 computer. For the unrecognised device I see USB\VID_1057&PID_B000/7&1934B425&0&1. I tried using this VID&PID in the cyusb file, but it would not recognize the device.

Any direction to proceed would help.

Thanks,

Nevil

Hi Nevil,

               How does that PC differ from others in terms of OS and processor?

Prajith