Chapter 2 – Installation
2-2
Voltage Control Module (P4)
Because MMX CPU chips have different voltage requirements than non-MMX CPU
chips, MMX CPUs require special voltage control modules.
CPU Type
Voltage Control Module Part Number
MMX
122032A-001
Non-MMX
108168A-001
Warning
If you use the non-MMX voltage control module (part number 108168A-
001) with MMX CPUs, you may damage the CPU chip.
Jumper Settings
Table Chapter 2 -1 defines the default jumper settings for the XVME-655’s processor
configurations.
Table Chapter 2 -1. Default Jumper Settings
Configuration
J1
J2
J3
J4
J6
J7
J8
75 MHz
A
B
B
B
A
A
B
100 MHz
A
A
A
B
A
A
B
133 MHz
A
A
A
B
B
A
B
166 MHz
A
A
A
B
B
B
B
200/200 MMX MHz
A
A
A
B
A
B
B
233 MMX MHz
A
A
A
B
A
A
B
Host Bus Frequency Select
J7 (BF1)
J6 (BF)
Frequency Fraction
B
B
2/5 (150/166)
B
A
1/3 (200/200 MMX)
A
B
1/2 (120/133)
A
A
2/3 (75/90/100)
A
A
1/3.5 (233 MMX)
PCI Bus Frequency Select
J2
PCI Frequency to set up AT-bus
A
33 MHz/30 MHz
B
25 MHz
CPU Clock Selection
J4
J3
Frequency Fraction
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