WL500g with 2 usb ports

[gwl]

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!

[roque69]

Hi.

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

[gwl]

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"...

[Styno]

ps: maybe this post should be moved into the "Custom Development"...

Good idea....done ;-)

[wtzm]

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.

[gwl]

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.

yes, it was my mistake.. there's no need for a clock generator at this point.
I still think that a RLC circuit is needed...
we need to filter the signal... the router is a very noisy environement...

[gwl]

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