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2-9
Jumper Settings
Explanation of
Jumpers
To modify the operation of the
motherboard, jumpers can be used
to choose between optional set-
tings.
Jumpers create shorts be-
tween two pins to change the
function of the connector. Pin 1 is
identified with a square solder pad
on the printed circuit board.
the motherboard layout pages for
jumper locations.
Note: Closed refers to the jumper being set
over both pins on a two-pin jumper header.
Open refers to the jumper being set over a
single pin of a two-pin jumper.
Front Side Bus Speed
JP2 sets the FSB speed.
speed = FSB x Core/Bus ratio.
Core/Bus Ratio settings are de-
scribed in Section 2-9. See Table
2-19 for jumper settings.
PCI 64 Speed Setting
JP13 sets the speed PCI 64. When
JP13 is set to "open", the PCI
speed is set 66MHz, and when the
JP13 is closed, the PCI speed is
set to 33 MHz. See Table 2-20 for
jumper settings.
See
F ro n t S id e B u s S p e e d
J u m p e r S e ttin g s (J P 2 )
CPU
Jumper
Position
1-2
2-3
O pen
* N ote: T he Auto setting allows
the C PU to set the speed.
P C I 6 4 S p e e d S e ttin g
J u m p e r S e tting s (J P 1 3 )
Jumper
Position
O pen
C losed
2-15
Chapter 2: Installation
3
2
C o n n e c t o r
Pins
J u m p e r
C a p
3
2
Setting
Pin 1-2 short
T a b le 2 -1 9
D efinition
Auto
100 M H z
133 M H z
T a b le 2 -2 0
D efinition
66 M H z
33 M H z
1
1
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