4-1
4
4
12-Slot VMEbus Backplane
Overview
This chapter provides a physical and electrical description of the 12-slot
VME bus backplane used in the MVME956AC chassis. Refer to
Chapter
1
for features and specifications of the backplane. Refer to
Chapter 6
for
removal and replacement procedures.
Physical Description
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
Backplane Power
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.
