Hot!USB2640i weird behavior

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madokapeng
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2018/09/12 08:48:23 (permalink)
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USB2640i weird behavior

Hi,
 
Our product is using USB2640i USB2.0 media controller. The product CPU is PPC 440Ex. There are two downstream port. One is USB for external storage, the other is micro SD card which is loaded with QNX OS 6.4. The product is in the market for a quite while.
 
Now, I found an issue that I think is related to USB2640i controller. When I copy a large file (ie. 800MB) from micro SD to USB, It failed to copy. I am using cp command in QNX to copy files. The failure is because the root directory has been dismounted, that is the SD card has been dismounted for some reason.
I did a bit deeper investigate. I probe the output of PIN35 - CARD_PWR which is the power provided to SD card. This pin is providing 3.3V. When the failure happens, the output of this pin is dropped. Not only this pin, even the XTAL1, XTAL2 for the crystal are also halt. Pin 47 - RBIAS is drop as well. It seems like the chip reset by itself. I thought It might be reset by the CPU. Then, I checked the Pin38 - nRESET is logic HIGH always. There is no reset signal from CPU. The 3.3 power to the chip is not dropping either.
 
Since the USB2640i is using default configuration. the CARD_PWR can provide 100mA sourcing current. I also monitored the current consumption of PIN35 - CARD_PWR. The DMM reads 50mA MAX, 35mA Avg. So, there is no over current at the failure moment.
 
If some one knows this chip well or have a clue why this failure happens. please reply to this post. I thank everyone in advance.
 
Please help...
Thank you again.
#1

4 Replies Related Threads

    madokapeng
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    Re: USB2640i weird behavior 2018/09/13 07:30:24 (permalink)
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    am I post in a right place? Hope I can get some help from microchip tech support.
     
     
    #2
    qhb
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    Re: USB2640i weird behavior 2018/09/13 13:39:45 (permalink)
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    This is a user forum. If no-one here can help you, then the way to actually ask "Microchip Tech Support" is to lodge a "Support Ticket".
    See: www.microchip.com/support
     

    Worst forum problems are now fixed, but the damn firewall is still there.
    #3
    roundrocktom
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    Re: USB2640i weird behavior 2018/09/14 06:51:56 (permalink)
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    The HOST software plays a role with the USB Devices.  
     
    If the USB2640 is not mounted, it wouldn't have that USB keep alive pulse. So it goes into power saving mode (hence XTAL turning off).   So you need the drive mounted at boot of the micro.   I'd submit it to microchip.com/support  but sounds like the issue resides in the microcontrollers USB support at boot.   
     
     
    #4
    madokapeng
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    Re: USB2640i weird behavior 2018/09/24 15:01:50 (permalink)
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    Thank you both. I already opened a case.
    #5
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