Motorola MVME956UM2, MVME956AC user manual VME Bus Backplane Description and Specifications

General Description

Power Supply Limit Considerations

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Caution

The MVME956AC chassis is supplied with a 550-watt, 3-output switching power supply. The power supply is capable of higher output currents than the interconnection to the backplane. As designed, the enclosure +5 Vdc output is rated at 60 amperes, the +12 Vdc output at 10 amperes (16 peak), and the -12 Vdc output at 10 amperes.

The current rating for each individual output must not be exceeded, and the total power supply output power must not exceed 550 watts. When calculating the 5-volt current, remember to include the backplane termination resistors.

The system integrator must ensure that the installed peripheral devices and VME module set do not exceed the power supply rating.

VME Bus Backplane Description and Specifications

The MVME956AC chassis contains one 12-slot, full 64-bit VME bus backplane mounted to the left of the peripheral device area. The backplane can accommodate up to 12 VME modules. It uses all signal and power lines for VME bus connectors P1 and P2.

Table 1-2. 12-Slot VME Bus Backplane Specifications

Characteristics	Specifications
Power consumption	5W (1.0 A max @ +5V), required by active
(without device	termination
modules)
Connectors	24 sockets: 160-pin IEC1076-4_xxx 2.54mm
Device sockets	connectors
	Socket spacing (center-to-center): 0.8 inch

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