User`s manual

Am486
®
Microprocessor PCI Customer Development Platform User’s Manual
2-32
CPU Voltage Adjustment (Q15–Q16)
The CPU power supply voltage can be adjusted by moving jumper JP4 or both
jumpers JP2 and JP3 on the PCI CDP. Selectable voltages are 2.5 V, 3.3 V, 3.45
V, or 5 V. Figure 2-9 shows the default configuration of the CPU voltage jumpers
(set for 3.45 V).
To select either 3.3-V or 2.5-V CPU voltage, leave JP2 and JP3 set to “ADJ” and
move jumper JP4 to the desired voltage.
To select 5-V operation, move both jumpers JP2 and JP3 to their “5 V” position.
Figure 2-9. Voltage Jumper Default Configuration (Q15–Q16)
CAUTION: Jumpers JP2 and JP3 must both be placed in the
same position. Positioning JP2 and JP3 differently can damage
the PCI CDP.
ADJ
5 V
3.45 V
2.5 V
ADJ
5 V
JP3JP2
JP4
3.3 V
!