Specifications

Chapter 1 Setting Up the LittleBoard 550
LittleBoard 550 QuickStart Guide 5
LB550QSG_01e
L8
L3
L2
L5
CPU (U1)
J2
F5
J5
J4
J3
DIMM1
J31
J21
U27
U26
U4
J28
Y1
Y5
U20
U23 U19
U9
BAT1
E
t
h
e
r
n
e
t
(
U
5
)
North
br
idg
e
(U2)
So
u
thbridge
(U3)
J1
J18
U34
U10
U15
U17
U11
U16
E
t
h
e
r
n
e
t
(
U
6
)
U21
U25
U14
U12
U8 U7
J12
J17
J14
J13
J15
J16
J24
J11
JP4
JP3
JP7
JP8
JP5
JP6
J10
J7
J32
J23
U24
U22
U33
L9
DIMM1
LCD 1 (J3)
LCD 2 (J4)
LVDS (J31)
Audio In/
Out (J28)
Ethernet
Port 2 (J32)
Power In (J10)Secondary IDE (J17)
CompactFlash
Socket (J23)
Serial B (J13, Serial Ports 3 & 4)
Ethernet
Port 1 (J7)
Floppy (J14)
Primary IDE (J12)
COM4 RS485
Term (JP8)
Utility 1 (J16)
Parallel (J15)
Utility 3 (J18)
CRT (J5)
PC/104-Plus
(J21)
Serial A (J11, Serial Ports 1 & 2)
J2)Fan (
CRT Fuse (F5)
Board
Grounding
Pad (8)
Ethernet
Grounding
Pad
Utility 2 (J24)
CF Master/
Slave (JP4)
CF Voltage
Select (JP3)
COM1 RS485
Term (JP5)
COM2 RS485
Term (JP6)
COM3 RS485
Term (JP7)
Figure 1-5. LittleBoard 550 Connectors
CAUTION The two Ethernet ports share a common ground (transformer center tap),
that is floating until you determine how the ground is connected. The
grounding holes (8) of the LittleBoard 550 are at the ground potential
(return) provided by the AT power supply. You must decide how to best
ground the Ethernet ground plane for proper operation in your situation.
NOTE To conform to the PC/104 and PC/104-Plus standards, keys have
been inserted into specific pins in the PC/104 and PC/104-Plus
connectors. Refer to the LittleBoard 550 Reference Manual for
more information.