CP308 Functional Description
ID 1027-4487, Rev. 3.0 Page 2 - 25
P R E L I M I N A R Y
2.3.10.2 Rear I/O Configuration
Rear I/O interfaces are only available on the rear I/O version of the board.
In order to implement the system rear I/O feature, a rear I/O backplane is necessary. This
backplane must comply with the CompactPCI Specification PICMG 2.0 R3.0, October 1999.
Ethernet Interfaces
Gigabit Ethernet signals are available either on the front RJ-45 connector or on the rear I/O
interface due to the implemented switches on the CP308.
Both Gigabit Ethernet channels are individually switchable to front or rear I/O. Switching over
from front to rear I/O or vice versa is effected using the uEFI BIOS settings (default: front I/O).
VGA Interface
VGA signals are available either on the front VGA connector, J3, or on the rear I/O interface
due to the implemented switch on the CP308. Switching over from front to rear I/O or vice versa
is effected using the uEFI BIOS or the board-specific registers (default: front I/O).
Serial Interface COM1 and COM2
COM1 is available either on the high-speed I/O extension connector, J12, or on the rear I/O
interface. Switching over from J12 to rear I/O or vice versa is effected using the uEFI BIOS
settings or the board-specific registers.
COM2 can be used only on the rear I/O interface and can be alternatively configured as GPIO
port.
USB Interfaces
Two dedicated USB 2.0 ports are available on the rear I/O CompactPCI connector J2.
Warning!
To support the rear I/O feature, a 3U CompactPCI backplane with rear I/O
support is required. Do not plug a rear I/O configured board in a backplane
without rear I/O support. Failure to comply with the above will result in damage
to your board.
Note ...
The CP308 provides 150 Ω termination resistors for the red, green and blue
VGA signals.
Thus, further 150 Ω termination resistors are necessary on the rear I/O module
to reach the required 75 Ω termination for the VGA connection.
Note ...
It is strongly recommended to use cables less than 3 metres in length for the
USB rear I/O interfaces.
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