Emerson MVME55006E manual VME Scon Select Header J27, PCI Bus 1.0 Speed Switch S4-2, J27 Settings

Hardware Preparation and Installation VME SCON Select Header (J27)

1.6.9VME 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.

Figure 1-11		J27 Settings
	J27		J27	J27
1		1		1
2		2		2
3		3		3
Always SCON		No SCON		Auto-SCON

(factory configuration)

1.6.10PCI 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 1-12	S4-2 Settings
		S4-2
1		ON	1	ON
2			2
PMC board controls			Force PCI bus 1.0
PCI 1.0 bus speed			to run at 33 MHz
(factory configuration)

26 MVME55006E Single-Board Computer Installation and Use (6806800A37D)