1264C User Manual
Chapter 4
UNDERSTANDING THE 1264C
Overview
The 1264C Mainframe consists of the following major functional
blocks.
•
Power Supply
•
Backplane
•
Cooling System
•
System Monitor
Figure 4-1
shows the functional block diagram of the 1264C
Mainframe.
Power Supply
The power supply accepts power from the AC mains and converts
it to DC to power the following:
•
VXI modules installed into the backplane
•
Backplane terminations and daisy chaining logic
•
System Monitor board
Power Supply
Interconnections
Power is supplied to the backplane through a board-to-board
connection eliminating any wiring and sub-backplane interconnect
boards. This design reduces the path impedance between the
supply and the VXI modules receiving power, which results in
improved dynamic current performance. See Appendix A for
specifications.
Remote sense correction is provided for the +5V, -2V, and –5.2V
VXI supplies. The remote sense signals are routed from PS1
through the monitor board (405141-J2) to the backplane via the
14-pin ribbon cable (405141-J1 to 405130-J50).
The Power Fail signal is routed from PS1 to the monitor board
(405141-J2) and used to generate the VME signals ACFAIL* and
SYSRESET*. These signals are then routed to the backplane
through the 14-pin ribbon cable (405141-J1 to 405130-J50).
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Understanding The 1264C 4-1
Test and Services, Inc. © 1998
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