Motorola MVME956AC User Manual

4-1

This chapter provides a physical and electrical description of the 12-slot 
VME bus backplane used in the MVME956AC chassis. Refer to 

 for features and specifications of the backplane. Refer to 

 for 

removal and replacement procedures. 

The backplane was designed to accommodate VME modules and disk 
drive units. It accommodates up to 12 double-high user VME modules 
containing both P1 and P2 connectors. The backplane is fully assembled 
with connectors and terminators. It contains:

❏

12 connectors on the top row to receive connector P1 of the VME 
modules

❏

12 connectors on the bottom row to receive VME module expansion 
connector P2 

VME modules that plug into the backplane require voltages of +5 Vdc, 
+12 Vdc, and -12 Vdc for operation. The MVME956AC chassis contains 
a power supply and wiring that provide these voltages to the backplane. 

The power connectors characteristics and the number and arrangement of 
their pins are summarized in Figure 4-1 on page 4-4.