AR-B1579 User
’
s Guide
3-12
A. System Base Clock & CPU Clock Multiplier (SW1)
ON
1
2
3
4
5
6
OFF
Clock
Multiplier
SW1 -- Factory Default Setting
7
8
D.O.C.
RS-485
Figure 3-26 SW1: CPU Clock Multiplier
(1) CPU Base Clock Select (SW1)
This board supports different types of CPUs. The clock generator needs to be set by SW1.
The CPU input clock is twice the operation clock.
SW1-4 SW1-5 SW1-6 Base Clock PCI Clock
ON ON OFF 50MHz
25MHz
OFF ON OFF 66.6MHz 33.3MHz
ON OFF OFF 60MHz
30MHz
OFF OFF OFF 55MHz
27.5MHz
OFF OFF ON
75MHz
37.5MHz
ON
1
2
3
4
5
6
OFF
Clock
Multiplier
7
8
D.O.C.
RS-485
Table 3-6 SW1: CPU Clock Multiplier
(2) CPU Clock Multiplier Select (SW1)
The CPU clock multiplier needs to be set by SW1.
ON
1
2
3
4
5
6
OFF
Multiplier
BF0
BF1
BF2
7
8
Figure 3-27 SW1: CPU Clock Multiplier
NOTE:
1. SW1 jumper setting – BF0-BF2: On presents Low, Off presents High.
2. Intel CPU MMX - 200 is factory default setting.
