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MVME55006E Single-Board Computer Installation and Use (6806800A37D)
Hardware Preparation and Installation VME SCON Select Header (J27)
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1.6.9 VME SCON Select Header (J27)
A 3-pin planar header allows the choice for auto/enable/disable SCON VME configuration. A
jumper installed across pins 1-2 configures for SCON disabled. A jumper installed across pins
2-3 configures for auto SCON. No jumper installed configures for SCON always enabled.
1.6.10 PCI Bus 1.0 Speed Switch (S4-2)
This switch can force PCI bus 1.0 to run at 33 MHz rather than the standard method of allowing
the PMC board to control whether the bus runs at 33 MHz or 66 MHz. Set to 1, it allows the
PMC board to choose the PCI 1.0 bus speed. Set to ON forces PCI bus 1.0 to run at 33 MHz.
Figure 1-11 J27 Settings
J27
1
2
3
1
2
3
Always SCON
J27
J27
1
2
3
(factory configuration)
No SCON
Auto-SCON
Figure 1-12 S4-2 Settings
PMC board controls
(factory configuration)
Force PCI bus 1.0
PCI 1.0 bus speed
to run at 33 MHz
1
ON
1
ON
2
2
S4-2