Ampro Corporation Single Board Computer Littleboard 550 - Manual (Page 19)

Chapter 2 Product Overview
LittleBoard 550 Reference Manual 13
L
B
550A
_0
1
b
L8
L3
L2
L5
CPU (U1)
J2
F5
J5
J4
J3
D
IMM1
J31
J21
U27
U26
U4
J28
Y1
Y5
U20
U2
3
U
1
9
U9
BA
T1
E
th
er
ne
t
(U
5)
No
rth
br
idg
e
(
U
2)
So
uthbr
idge
(
U
3)
J1
J18
U3
4
U1
0
U1
5
U17
U1
1
U16
E
th
er
ne
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)
Utility 2 (J24)
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
Figure 2-4. Connector and Fuse Locations (Top view)
CAUTION The two Ethernet ports share a common ground (transformer center tap),
that is floating until you determine how the common ground is
connected. The grounding holes (8) of the LittleBoard 550 are
connected to ground potential (return) of the DC power supply
connected to the board through J10.
NOTE Pin-1 is shown as a black pin (square or round) in all connectors and
jumpers in all illustrations.