Siemens SIMATIC HMI IPC677C Operating Instructions Manual page 231

The following table lists the assignment of the USB ports to the USB interfaces:
USB port
0
1
2
3
6
7
8
9
10
Advanced menu > Chipset Configuration
Figure 16-11 Submenu Advanced menu > Chipset Configuration
Entry
Port 80h Cycles
VT-d
HPET
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04
USB interface
Ext. interface X60 P1
Ext. interface X60 P2
Ext. interface X60 P3
Ext. interface X60 P4
Int. interface X43 Pin 1 - 5
Int. interface X43 Pin 6 - 10
Front-end interface of the panel fronts X42
Int. interface X48
Keyboard / Touch controller interface of the panel fronts X44
Meaning
Output Port 80 status display to PCI bus or LPC BUS (status
display at the device).
Enable or disable advanced support for virtualization
technology "DIRECT I/O"
Enable High Precision Event Timer
Detailed descriptions
16.4 BIOS-Setup
231