Setup and Operation 2-59
5.
Power on the system. The system will beep.
6.
Power off the system.
7.
Reset SW4-1 to the OFF position.
8.
Replace the system unit cover and peripheral cables and turn on the system and
run Setup (see Section 2, “Setting System Parameters”).
Jumper Settings
The system board contains three jumper plugs for enabling/disabling various functions.
Figure Section 2-5 shows the location of the jumpers. The following subsections describe
the settings and functions of the system board jumpers.
Primary Cache Jumper (J33)
J33 is used to set the primary cache of the CPU(s) to write-back or write-through. When
one processor is installed, the jumper must connect pins 1 and 2. This sets the primary
cache to write-back. When two processors are installed (optional dual processor
configuration), the jumper must connect pins 2 and 3. This sets the primary cache to write-
t0hrough.
Instruction Pipeline Jumper (J34)
J34 is used to enable or disable the instruction pipelining ability of the processor(s). When
one processor is installed, the jumper must connect pins 1 and 2. This enables the
processor’s ability to pipeline instruction fetching. When two processors are installed, the
jumper must connect pins 2 and 3. This disables the processor’s ability to pipeline
instruction fetching
Voltage Regulator Jumper (J39)
J39 is used to choose between two voltage ranges on the 3.3 voltage plane. When a 90
MHz processor is installed (Image P90E), pins 2 and 3 must be shorted. This sets the 3.3
voltage plane to the VR specification voltage (3.300V to 3.465V). When a 100-MHz
processor is installed (Image P100E), pins 1 and 2 must be shorted. This sets the 3.3
voltage plane to the VRE specification (3.450V to 3.600V).
Table Section 2-23 lists switch and jumper settings for setting the cache, instruction
pipeline, and voltage regulator functions for the Image P90E and Image P100E.