Little Board/P5x Technical Manual

Jumper Summary

Ampro installs option jumpers in default positions so that in most cases the Little Board/P5x requires no special jumpering for standard AT operation. You can connect the power and peripherals and operate it immediately.

Jumper-pin arrays are designated W1, W2, and so forth. Jumper pins are spaced 2 mm apart. A square solder pad identifies pin 1 of each jumper array. Table 2– 2 is a summary of jumper use. Factory settings are shown in the Default column. Some jumpers are set at the factory to configure options that are not user-settable. These are indicated in the table. Do not change these settings.

Table 2– 2. Configuration Jumper Summary

Jumper

 

 

Group

Function

Default

 

 

 

W1

Serial 1 RS-485 100 Ohm Termination

OFF

 

ON=Terminated, OFF=Unterminated

 

W2

SCSI Termination Power

OFF

 

ON Connects Termination Power to SCSI Bus

 

W3, W4,

Bus/CPU Speed Setting

As Req’d.

W5

(Factory settings - do not change)

 

W6

CPU Voltage (Factory setting - do not change)

As Req’d

 

1/2=3.3V

 

 

2/3=2.5V

 

W7

Serial 3 RS-485 100 Ohm Termination (this is a

OFF

 

factory option. May not be implemented on your

 

 

board)

 

 

ON=Terminated, OFF=Unterminated

 

W8

Watchdog timer reset enable

OFF

 

ON=Enabled, OFF=Disabled

 

W9

System Bus Frequency Selection (Factory option -

OFF

 

do not change)

 

 

ON=60 MHz, OFF=66 MHz

 

W10

External BIOS Board Enable/Cable Connection

ON

 

ON=Normal, OFF=External Cable

 

W11

BIOS Flash EPROM Programming Power

ON

 

ON=Programming enabled

 

 

OFF= Programming disabled

 

W12

Compact Flash IDE Master/Slave

ON

 

ON=Master, OFF=Slave

 

2–7

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Ampro Corporation P5X manual Jumper Summary, Jumper Group Function Default