786LCD/mITX Family
KTD-00629-K
Public User Manual
Date: 2009-10-13 Page
38 of 77
4.11 USB Connector (USB)
The ICH4 contains an Enhanced Host Controller Interface (EHCI) compliant host controller that supports
USB high-speed signaling. High-speed USB 2.0 allows data transfers up to 480 Mb/s which is 40 times
faster than full-speed USB. The ICH4 also contains three Universal Host Controller Interface (UHCI)
controllers that support USB full-speed and low-speed signaling with a total of 6 ports.
All six USB ports supports USB2.0 and USB1.1 and all ports supports Over-current detection.
USB Port 0 and 3 are supplied on the combined ETHER1, USB0, USB3 connector. USB Ports 1 and 4 are
supplied on the FRONTPNL connector; please refer to the FRONTPNL connector section for the pin-out.
USB Ports 2 and 5 are supplied on the USB25 connector.
USB Port 0, 1, 2 and 3 supports USB Legacy mode.
4.11.1 USB Connector 0/3 (USB0/3)
USB Ports 0 and 3 are mounted together with ETHER1 ethernet port.
Note
Pull
U/D
Ioh/Iol
Type
Signal
PIN
Signal
Type
Ioh/Iol
Pull
U/D
Note
1 2 3 4
1
-
-
PWR
5V/SB5V GND
PWR
-
-
IO
USB3- USB3+
IO
1 2 3 4
1
-
-
PWR
5V/SB5V GND
PWR
-
-
IO
USB0- USB0+
IO
Note 1:
The 5V supply for the USB devices is on-board fused with a 1.5A reset-able fuse. The supply is
common for the two channels. SB5V is supplied during power down to allow wakeup on USB device activity.
In order to meet the requirements of USB v.1.1 standard, the 5V input supply must be at least 5.00V.
Signal
Description
USB0+ USB0-
USB3+ USB3-
Differential pair works as Data/Address/Command Bus. Legacy USB is supported by
both USB0 and USB3.
USB5V
5V supply for external devices. Fused with 1.5A reset-able fuse.
4.11.2 USB Connector 2/5 (USB25)
The pinout of the USB connector USB25 (no Shroud) is as follows:
Note
Pull
U/D
Ioh/Iol
Type
Signal
PIN
Signal
Type
Ioh/Iol
Pull
U/D
Note
-
-
PWR
5V/SB5V 1 2
5V/SB5V
PWR
-
-
IO
USB2- 3
4
USB5-
IO
IO
USB2+ 5
6
USB5+
IO
-
-
PWR
GND 7
8
GND
PWR
-
-
-
-
KEY
10
NC
-
-
Signal
Description
USB2+ USB2-
USB5+ USB5-
Differential pair works as Data/Address/Command Bus. Legacy USB is supported by
USB2.
USB5V
5V supply for external devices. Fused with 1.5A reset-able fuse.
