Acrosser AR-B1550 - Manual (Page 17)

AR-B1550 User s Guide
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3.2.3 Reset Header (J1)
The J1 is used to connect to an external reset switch. Shorting these two pins will reset the system.
1 2
1 Reset+
2 Reset-
3.2.4 Power Connector (J3)
The J3 is an 8 -pin power connector. It’s the standard connectors on all Acrosser boards.
1 8
J3
1 GND
2 VCC
3 VCC
4 GND 5 GND
6 12V
7 REVERSED
8 REVERSED
3.2.5 CPU Select
(1) CPU Clock Multiplier Select (JP1)
JP1
1 3
2
5
4 6
1-2 3-4 5-6 Multiplier Note
CLOSE CLOSE CLOSE 4X
CLOSE CLOSE OPEN 10X
CLOSE OPEN CLOSE 9X
CLOSE OPEN OPEN 5X
OPEN CLOSE CLOSE Reserved
OPEN CLOSE OPEN 6X Factory Preset
OPEN OPEN CLOSE 7X
OPEN OPEN OPEN Reserved
JP1: CPU Clock Multiplier
(2) CPU Base Clock Select (JP2)
JP2
1
2
3
4
1-2 3-4 Base Clock PCI Clock
ON ON 50MHz 25MHz
OFF ON 66.6MHz 33.3MHz
ON OFF 60MHz 30MHz
JP2: CPU Base Clock
(3) CPU Logic Core Voltage Select (SW2)
ON
1 2 3 4 5
OFF
SW2 -- Factory Default Setting
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