USB on board

  • Thread starter Thread starter Mark G.
  • Start date Start date
M

Mark G.

Am running an ASUS A7N8X-E and was wondering about the USB in the back.
First there is the USB up by where the PS2 connection is and then there are
the 2 down below. Are they both the same? What I mean is, is the ones down
below considered a hub or does the MB actually have 4 USB's, not including
the pin connector ones on the bottom right of the MB? Thanks much.
 
All four are onboard USB 1.1/2.0 so you can enable usb 1.1 on it's own,
1.1&2.0 or tuen them off.
If you have front usb ports on your case then you can have six usb ports in
total.
I have the four rear ones and two front of case ones.
 
Mark said:
Am running an ASUS A7N8X-E and was wondering about the USB in the
back. First there is the USB up by where the PS2 connection is and
then there are the 2 down below. Are they both the same? What I mean
is, is the ones down below considered a hub or does the MB actually
have 4 USB's, not including the pin connector ones on the bottom
right of the MB? Thanks much.
Click to expand...

According to windows, there are 3 host controllers (including the one with
pin headers on the motherboard) - the two pairs of USB ports on the back
each have their own controller. But thats Windows. I suspect it's
reasonable though. Each controller has a hub with two ports.

However, in Device Manager, only one controller appears to be enhanced
(USB2.0), although all 6 ports should be USB2.0 compliant, so as to how much
of the 3 controllers, 2 ports each is "logical" and how much is "physical",
I dunno.

Ben
 
Ben said:
According to windows, there are 3 host controllers (including the one with
pin headers on the motherboard) - the two pairs of USB ports on the back
each have their own controller. But thats Windows. I suspect it's
reasonable though. Each controller has a hub with two ports.

However, in Device Manager, only one controller appears to be enhanced
(USB2.0), although all 6 ports should be USB2.0 compliant, so as to how much
of the 3 controllers, 2 ports each is "logical" and how much is "physical",
I dunno.

Ben
Click to expand...

Generally the OS's view of the controller is that there is one EHCI (USB
2.0) controller for all ports, and one OHCI or UHCI (USB 1.1) controller
for each pair of ports. USB 1.1 devices appear to be connected to one of
the USB 1.1 controllers, while USB 2.0 devices appear to be connected to
the enhanced USB 2.0 controller. Generally it is all the same
controller which just has multiple interfaces on it..
 
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