Mainframe theory of operation
Slot connectors
Each slot conne
ctor provides the interface between the TG8000 mainframe and an
installed module. The slot connector provides CPU related signals such as data bus
and address bus, clock signals, power, and other control signals to the modules.
DC/DC converters
This block co
nverts the +5 V supplied by the Power Supply module to –5 V,
3.3 V, 8 V, and 5 V a nalog for use by the Main board and the slots. Various
voltages needed only on the Main board, such as to drive the DDR and processor
core, are also provided.
Thehighcurrent5Vand3.3Vvoltagessuppliedtotheslotsarefusedateach
slot. All of the major voltages, including both sides of each fuse, are monitored by
the voltage diagnostic.
Network interface
This block controls the Ethernet interface. The 10/100/1000 BASE-T port is
located on the rear panel of the Power Supply module.
GPI interface
The GPI interface allows the CPU block to access the user inputs and outputs via
the GPI port located on the rear panel of the Power Supply module.
Power Supply module
The Power Supply module contains the AC/DC power supply that derives the
+5 V supply voltage from the AC line and supplies it to the Main board.
The Fan board senses the air te mperature and adjusts the fan speed, and houses
the rear panel connectors for the Network and GPI signals.
The Power Adapter board passes the signals from the other parts of the Power
Supply module and contains a nonvolatile memory device for logging the usage
hours of the Power Supply module.
2–8 TG8000 Multiformat Test Signal Generator Service Manual
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