IEI Integration ICE-DB-T6 - Manual (Page 46)

Type 6 Carrier Board Design Guide
Page 36
3.4 Universal Serial Bus (USB)
The Universal Serial Bus (USB) provides a bi-directional, isochronous, hot-attachable
Plug and Play serial interface for external peripheral devices. A COM Express Module
provides a minimum of four USB ports and can support up to eight USB 2.0 ports and four
USB 3.0 ports.
The USB physical topology consists of connecting the downstream hub port to the
upstream port of another hub or to a device. The USB can operate at three speeds.
High-speed (480 Mb/s) and full-speed (12 Mb/s) require the use of a shielded cable with
two power conductors and twisted pair signal conductors. Low-speed (1.5 Mb/s) does not
require the use of a cable with twisted pair signal conductors, but it is recommended to do
so.
3.4.1 Signal Description
Table 3-7 shows COM Express USB signals, including pin number, signals, I/O, power
plane, terminal resistors, damping resistors and descriptions.
Pin Signal I/O Description
A46
A45 USB0+
USB0- I/O USB Differential Data Port 0.
B46
B45 USB1+
USB1- I/O USB Differential Data Port 1.
A43
A42 USB2+
USB2- I/O USB Differential Data Port 2.
B43
B42 USB3+
USB3- I/O USB Differential Data Port 3.
A40
A39 USB4+
USB4- I/O USB Differential Data Port 4.
B40
B39 USB5+
USB5- I/O USB Differential Data Port 5.
A37
A36 USB6+
USB6- I/O USB Differential Data Port 6.
B37
B36 USB7+
USB7- I/O USB Differential Data Port 7.
B44 USB_0_1_OC# I 3.3V CMOS USB over-current sense, USB ports 0 and 1. A pull-up for this
line shall be present on the module. An open drain driver from
a USB current monitor on the Carrier Board may drive this
line low. Do not pull this line high on the Carrier Board.
A44 USB_2_3_OC# I 3.3V CMOS USB over-current sense, USB ports 2 and3. A pull-up for this
line shall be present on the module. An open drain driver from