Publication No. 500-9300527837-000 Rev. A.0
Functional Description 41
5.7 USB
The PCH provides up to four USB2.0 ports using EHCI and XHCI controllers.
These ports are called USB0, USB1, USB2, and USB3.
Two power switches are used to switch VBUS power to the ports. USB0 and USB1
have separate power pins but share a single power switch (maximum 1 A for each
port/pin and 1.5 A for combined load). USB2 and USB3 also have separate power
pins but share a single power switch (maximum 1 A for each port/pin and 1.5 A
for combined load). The power switches provide over-current protection (OCP)
and are capable of signaling over-current conditions to the PCH.
NOTE
The PCH does not support OCP for each port independently, and OCP inputs are shared across ports.
The following table shows where each USB port is connected (assuming the board
is configured accordingly):
5.8 Serial Ports
The SBC347A provides a total of three serial COM ports, of which two (COM1
and COM2) are available to the user. The third port is connected to the optional
onboard Intelligent Platform Management Interface (IPMI) Board Management
Microcontroller (BMM).
The COM ports each have a 16C550 universal asynchronous receiver transmitter
(UART) compatible register set, and support is available across a variety of
Operating Systems.
COM1 and COM2 support RS232, RS422, and RS485.
The following table summarizes the COM port connections:
Table 5-4 USB Signal Availability
Port PCH Port Number USBx_DATA_P USBx_DATA_N USB_Px_PWR
0
0
P1/B10
P1/C10
P1/A11
1
1
P1/E10
P1/F10
P1/B11
2
8
P1/B12
P1/C12
P1/D11
3
9
P1/E12
P1/F12
P1/E11
Table 5-5 COM Port Connections
Port
Build Variant Availability
RS232 Signal Set
RS422/RS485 Signal Set
COM1
All variants
4-wire (TXD, RXD, RTS, CTS) 4-wire (TXD_A, TXD_B, RXD_A, RXD_B)
COM2
All variants
4-wire (TXD, RXD, RTS, CTS) 4-wire (TXD_A, TXD_B, RXD_A, RXD_B)
COM3
Permanent connection to
BMM
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