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Chapter 2 Product Overview
LittleBoard 550 Reference Manual 11
Major Integrated Circuits (ICs)
Table 2-1 lists the major integrated circuits, including a brief description of each, on the LittleBoard 550
and Figure 2-4 shows the location of the major chips.
Table 2-1. Major Integrated Circuit Description and Function
Chip Type Mfg. Model Description Function
CPU (U1) VIA
Technologies, Inc.
Eden ESP 10000,
ESP 5000, ESP 3000
CPUs offered at 1GHz,
533MHz, and 300MHz
Embedded
CPU
Northbridge
(U2)
VIA
Technologies, Inc.
VT8606 (Twister-T)
Northbridge functions plus
Video
Memory
and Video
Southbridge
(U3)
VIA
Technologies, Inc.
VT82C686B Southbridge provides most
standard I/O functions
I/O
Functions
Super I/O
(U13)
Standard
Microsystems
SP37E760 This Super I/O controller
provides two additional serial
ports
Serial
ports
Ethernet
Controllers
(U5, U6)
Intel 82551ER Ethernet Controllers provided
by two independent
10/100BaseT Ethernet.
Ethernet
functions
LB550_01a
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
Et
her
n
et
(U5)
No
rthbridg
e
(
U2)
Southbr
idge
(U3)
J1
J18
U34
U10
U15
U17
U11
U16
Ether
n
et
(
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
CPU (U1)
Northbridge (U2)
Southbridge (U3)
Ethernet 2 (U6)
Ethernet 1 (U5)
Audio
Amplifier (U27)
Audio
CODEC (U26)
Flash (U17)
Battery (Bat1)
Clock (U4)
On Board
Voltage
Regulation
Circuitry
Thermal
Monitor (U33)
Figure 2-3. LittleBoard 550 Component Location (Top view)