Page 1 of 3 123 LastLast
Results 1 to 15 of 40

Thread: WL500g with 2 usb ports

  1. #1

    USB connectivity (hardware related Q)

    Hi,

    Looking at the FCC photos around USB jack and how it is connected to CPU of WL500G I see that it is identical to my Belkin F5D7230-4, thou on my router none of the components are placed on the PCB.
    I was hoping that somebody with hardware skills could measure the resistor values of those four resistors next to the USB jack and post them here. I'm attaching a schema of the USB circuit of Belkin router.
    Appreciate any help with adding USB to my router.

    Thank you,

    Sergiy
    Attached Images Attached Images  

  2. #2
    Join Date
    Dec 2003
    Location
    Russian Federation
    Posts
    8,355
    Check the image. So,
    R733, R734 should be 15 Ohms - they're R53&R54 on the ASUS board and coming from USB connector also they're attached in series with L16, L17 (but you can omit them as seems),

    R723, R724 are pull-downs 15K - they're R54 and R53

    C731 (CE2) - 330 uF, and there is also C73 100nF in parallel.

    Also +5V comes via 0.75A fuse (F2).
    Also, there is should pull-up register for USB_CNTRL line - R57, rated with 10K (this is very important, otherwise BCM4702 as seems will not use USB port).
    Attached Images Attached Images  

  3. #3
    Join Date
    Dec 2003
    Location
    Russian Federation
    Posts
    8,355
    Another picture for second (unused) USB port - will help you to locate parts on your board
    R97, R99 - 15K - pull-downs for USB2_N & USB2_P
    R178 (not installed) should be 10K - pull-down to disable port (USB_CNTRL) - this should pulled-up to enable it.

    Please make a hi-res image of your board.
    Attached Images Attached Images  

  4. #4
    Thank you Oleg,

    This is even more then I was hoping for since I didn't even realize that a pull-up resistor has to be placed on the board in order to enable USB functionality. It seems that on Belkin it is R725. Can you confirm that these two lines that connect to pins B6 and C9 (thou I might be off a pin or two) are indeed USB lines? (Everything so far points to they are, but I thought I'd double check).
    As for the second USB port, it would be nice to pull out this one as well, but that would be another project. I see some unpolulated pads on the board around the CPU, these are for resistors: R34, R37, R653, R654, R655, R659 - but it is hard to say where they connected to it.

    Thanks again,
    Sergiy
    Attached Images Attached Images   

  5. #5
    just thought I'd add some more info: the R725 seemed to be wired to the B8, and right next to it is a pull-down R889, which is connected to B7 - I wonder if this one has anything to do with USB?

  6. #6
    Join Date
    Dec 2003
    Location
    Russian Federation
    Posts
    8,355
    Belkin uses BCM4712, I've no idea of it pinout. BCM4702 uses pins P20,21,22 for usb1 and N20,21,22 for usb2.
    You will probably need to check the reverse side of PCB.
    There should be pull-downs for the USB2, but who knows. ;-)

  7. #7

    WL500g with 2 usb ports

    Running "dmesg" on a wl500g, right after booting, shows this:
    [...]
    usb.c: registered new driver usbdevfs
    usb.c: registered new driver hub
    usb-ohci.c: USB OHCI at membase 0xb8004000, IRQ 2
    usb-ohci.c: usb-00:04.0, PCI device 14e4:4715
    usb.c: new USB bus registered, assigned bus number 1
    hub.c: USB hub found
    hub.c: 2 ports detected
    [...]

    so... does anyone know if the "2 ports detected" are _actually_ avaliable in the hardware... and if yes, is it possible to add second usb port to a wl500g?

    thanks,
    [ WL-500G | fw: 1.9.2.7-7f ]

  8. #8
    Join Date
    Oct 2005
    Location
    Denmark
    Posts
    21

    Wink Connection 2 USB

    Hi,

    If i'm right - there's a HOWTO-guide on this subject at the forum - somewhere...

    Searching......... found 1 result...

    http://wl500g.info/showthread.php?t=1779

    I know that this guide is done at the 500g(X)-router - but if it's the same inside - it shouldn't be a problem - correct my anyone, if i'm wrong!

    Otherwise, enjoy!

  9. #9
    the wl500g and the wl500gx are different....
    the wl500gx has a custom USB chip that can handle usb2.0...

    look at this picture...
    http://wl500g.info/attachment.php?at...9&d=1109265320

    in here the usb connectors link to a Via chip... that only exists in this version...

    NOW, the problem is:
    Can it be done on a WL500G? (which claims to have 2 usb ports!)
    [ WL-500G | fw: 1.9.2.7-7f ]

  10. #10
    Join Date
    Sep 2004
    Location
    Austria
    Posts
    125
    I _guess_ that the second port can be used, but I'm not quite sure if the method works. (Haven't had time to try it.)
    On my rev. 2.4 wl-500g there is a 15k resistor package (RN28) which seems to provide the necessary pull down to GND for the two USB Ports (each one has two differential signals - USB_N and USB_P, of course). Maybe it's enough to connect an USB socket to the two solder points (and +5V & GND of course).
    Name:  usb_con_1.jpeg
Views: 6115
Size:  47.5 KB
    Note: USB1 means USB - Port1 and USB2 means USB - Port 2.

  11. #11
    humm.. .that's very interesting..
    if it works, then it means that we can connect a usb memory _inside_ the router, and boost the internal storage... all noiseless and low power...
    And still get an external free usb port... for a REAL harddisk...

    I'll look into it when I get some time!

    thanks for your reply!
    [ WL-500G | fw: 1.9.2.7-7f ]

  12. #12
    Hi.

    Quote Originally Posted by gwl
    And still get an external free usb port... for a REAL harddisk...
    In my case, it will be a port for a second harddisk .

    Hope that you have the time very soon .

    Miguel

  13. #13
    UPDATE (Dec1,2005): The correct solution is on the bottom of this page


    FIRST: DON'T TRY THIS!!! IT's INCOMPLETE AND UNTESTED !!!!!!

    I believe that there are 2 usb ports on the BCM4702.
    The second USB port exists, but is linked to earth via some resistors. (15K)
    So, these are the necessary connections to mess with:
    USB_P2; USB_N2; USB_CTRL2

    First thing: I bet the components for the second port aren't on board..
    (maybe only the pull-down resistors).

    Here's what needs to be modified for the (2nd usb port):
    1st) usb_c2 connects to +5v through a 10k(15k?) resistor...
    Connect a +5v source (with a couple capacitors) to a 0.75amp fuse and that to pin 1 of the new usb plug . Pin 4 connects to gnd.

    So, Which pin is USB_CTRL2 ?!? Where is it?!? is it internal? is it already connected to +5v?

    2nd, USB_P2 and USB_N2 can't be connected direclly into a usb plug...
    they need to be pull down to gnd with 15k resistor(?), and then the signals must go through some sort of RLC circuit... so, we need an impedance (which L value?!?), a capacitor (?) and a resistor (most likelly 15k also).

    this was a mistake:...
    [3rd... USB_P2 also needs some sort of an external clock generator... (12Mhz?, 24Mhz?)
    (USB_P1 has one.. but I don't think that we can borrow this signal into USB_P2... )]

    any ideas?

    best regards.


    ps: maybe this post should be moved into the "Custom Development"...
    Last edited by gwl; 01-12-2005 at 00:10.
    [ WL-500G | fw: 1.9.2.7-7f ]

  14. #14
    Join Date
    Apr 2004
    Location
    Netherlands
    Posts
    1,306
    Quote Originally Posted by gwl
    ps: maybe this post should be moved into the "Custom Development"...
    Good idea....done ;-)

  15. #15
    Join Date
    Sep 2004
    Location
    Austria
    Posts
    125
    Just an amandment to gwl's post: In my opinion there is no clock generator needed/involved in any way; this seems to be a misinterpretation. Pull downs should be already provided via RN28.
    Most probably ASUS didn't implement any kind of filtering for the USB-port on the back of our router, so why should we bother to do this for the second one?
    A 15 Ohm series resistance is implemented via RN2 on my board, there are even two unused resistors available.

Page 1 of 3 123 LastLast

Similar Threads

  1. LAN ports die again.....
    By vitalstatistix in forum WL-500g Q&A
    Replies: 8
    Last Post: 19-04-2005, 00:42
  2. Closing and opening ports
    By bop in forum WL-500g Q&A
    Replies: 4
    Last Post: 28-11-2004, 11:03
  3. Opening ports to all ip's.
    By jbssm in forum WL-500g Q&A
    Replies: 1
    Last Post: 05-10-2004, 13:09
  4. Route ports
    By Holli in forum WL-500g Q&A
    Replies: 4
    Last Post: 16-08-2004, 12:01
  5. Opening TCP ports
    By Floejen in forum WL-500g Q&A
    Replies: 5
    Last Post: 23-06-2004, 13:57

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •