Flip Wilson wrote:
> On Wed, 05 Nov 2008 00:00:51 -0500, Paul wrote:
>> Flip Wilson wrote:
>>> I have a card reader that I previously connected via USB port and
>>> worked fine. After upgrading my mobo, I decided to connect the same
>>> card reader to a set of USB pins on the motherboard (accomplished by
>>> connecting the included adapter with a female USB on one end and
>>> connectors for motherboard pins on the other). Now the card reader
>>> isn't discovered by windows xp, not even when displaying hidden devices
>>> in device manager. The card reader also doesn't show up when I boot to
>>> If this was simply a driver issue, I would expect the card reader to at
>>> least show up, if not work correctly. It seems to me that the device
>>> isn't getting power.
>>> Not sure where to go from here.
>> Could you mention the brand and model number of motherboard ?
>> Some motherboards have less than ideal pin assignments, and in some
>> cases, you have to modify the adapter.
>> The diagram at the bottom of this page, shows how the wiring on a 2x5
>> can be moved around, if it turns out the motherboard and adapter are not
>> compatible. The little plastic tabs can be lifted with a hobby knife,
>> and the pin and wire then slide out. I did one just the other day, and
>> it is pretty hard to hold the tab open without snapping it, and guide
>> the pin and wire out at the same time. Took a few tries.
>> Also, if you mention the card reader make and model, maybe I can
>> download a manual for that as well and have a look.
> Mobo is an XFX nForce 610i GeForce7050. Don't know about the card reader.
> May be a Creative I/O. Certainly wasn't was memorable brand.
After registering on the XFX site, this is the manual I got for the 610i/7050.
There are two models, and both models seem to have the same manual.
(MG-61MI-7059 and MG-610I-7059). Even though one of those
motherboards has two onboard 2x5 USB connectors, and the other
has three of them. http://www.xfxsupportb.co.uk/MCP73%2...0%20070928.zip
The USB pinout looks standard. There are two ways to interpret
the "No Connect" label of the tenth pin. Some interpret to mean
"make no connection", meaning there could be something electrically
connected, but the user is not to connect to it. That definition
is generally frowned upon (designers shouldn't do that!). Ideally,
NC means there is no electrical connection of the motherboard to
the pin, so the cable that is connected will make no difference,
if it connects something to the tenth pin. (My motherboard
manual calls pin 10 "dummy", which is another way to label it.)
1 VCC X X VCC 2
3 D- X X D- 4
5 D+ X X D+ 6
7 GND X X GND 8
9 X NC 10 NC = No Connect
The original intent of that header, may have been to have shield GND on
the tenth pin. The shield ground would connect to the foil or braid
surrounding the other wires (good USB cables are shielded). But the
cable assemblies in use now, might just as easily connect
the shield to the same ground as pins 7 and 8.
The header has two interfaces on it. Pins 1-3-5-7 make a
four pin interface supporting one USB2 device. Pins 2-4-6-8
make a second interface supporting a second USB2 device.
Some card readers come with a 1x4 internal cable, which would
connect to one column or the other column of pins.
When the adapter cable sports a 2x5 connector on the end, the purpose
of the missing pin, is for keying. It is intended to prevent
the end user from plugging it in the wrong way. In the case of the
1x4 type cable, there is more potential for screwing it up. (You
could easily reverse the connector 180 degrees, or shift it down
So I don't see anything wrong with this one. There is no "OC#" on the
tenth pin, and the other pins look "normal". Inserting the cable wrong,
could make all sorts of trouble for you.