Re: Front USB connection to motherboard
- From: Paul <nospam@xxxxxxxxxx>
- Date: Wed, 25 Apr 2007 22:41:46 -0400
Charlie Wilkes wrote:
I have a socket A board that I'm setting up in a salvage case... I'm confused about the pins for the front USB connector. Here's what the mfr. says about the pins:
1 vcc
2 data+
3 data-
4 gnd
5 gnd/nc
I'm confused because there are 9 pins. I assume the numbering goes:
1 2
3 4
5 6
7 8
K 9
Is it safe to assume the 1-4 sequence starts over with pin #5?
Here is a link to the online docs for the board:
http://www.j-mark.com/PRODUCT/mb/v4mdmp.html
Any thoughts/guidance much appreciated...
Charlie
Well, the first thing I don't like about their pinout, is the
data+ and data- are on the wrong pins. I checked the manual
for the motherboard of the computer I'm typing on, and it looks
like this. I've also taken the liberty of overlaying the pinout
on the 2x5 header.
/ vcc X X vcc \
USB _/ data- X X data- \_ USB
#1 \ data+ X X data+ / #2
\ gnd X X gnd /
X NC
So the 2x5 header layout, is really a couple of 1x4 layouts
side by side.
If you want to see the official Intel recommendation, check out
section 3.2.3 on PDF page 28. (Formfactors.org is an Intel site.)
It is essentially the same as my pinout above, only missing "NC".
http://www.formfactors.org/developer%5Cspecs%5CA2928604-005.pdf
If you are going to connect that motherboard, to a standard ATX
computer case, you'll need to swap the D+ and D- pins on each
logical 1x4 cluster. Your computer case should have a plastic
shell that holds the pins for the USB connector, and you can move
the pins from one hole to another, if you need to. An example of
how to do that, is shown here.
http://www.frontx.com/head_con.html
Some examples of various USB header patterns are shown here.
The last one on the page is really screwy, and I wish they
had mentioned which motherboard they found that on.
http://www.frontx.com/cpx108_2.html
Lastly, if you really want USB that bad, you can always plug
a PCI USB2 card into a PCI slot. That way, you don't have to
wire anything, and can just plug into the back of the machine.
If you need front access, you can use a nice powered USB2
hub, and stick it up on top of the computer, near the front.
OK, I just found a manual for your motherboard. So now you
have yet another source of info. (Jetway is a master of
disguise, and they also use the Machspeed product name.
So now I can add J-Mark to my list.)
http://download.jetway.com.tw/download.asp?sorder=Name&sword=V4MDMP
http://216.185.128.200/temp/jetway0c/downloads/manual/SHV2MDMP1A.pdf
On page 15 of SHV2MDMP1A.pdf, it shows in fact that they did
use the standard pinout. So if you believe this manual, you
don't need to swap wires. But, note that pin 9 is labelled "OC",
and that means, if there is a black wire on your computer
case wiring, corresponding to OC (pin 9), you should remove
that wire from the plastic 2x5 shell. You don't want GND
from the black computer case wire, touching the OC pin. If it
does touch, the USB port will shut off, and you'll be pestered by a
"USB overcurrent" error.
HTH,
Paul
.
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