Tektronix TLA 704, Service Manual

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Theory of Operation
3–2
TLA 704 Color Portable Mainframe Service Manual
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Front Panel Keypads and Knobs
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Glidepoint Pointing Device
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Hard Disk Drive
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Floppy Disk Drive
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Mechanical Chassis
The power supply provides all voltages and currents to the portable mainframe.
The power supply connects to the backplane at P400 and P401.
The backplane supports up to four “C” sized TLA 700 slots for support of
instrument modules. The backplane also connects the power supply secondary to
the remainder of the system, including the fans, distributes the precision 10-MHz
(CLK10) system clock, and supports all communication to, from, and between
the instrument modules.
The Controller Board provides the portable mainframe with a high-performance
PC-based controller architecture, including graphics and I/O, and interfaces to
the backplane bus and front panel. The Controller Board mounts vertically on the
left side of the instrument and connects to the back of the backplane via a P1/P2
interconnect. The Controller Board also provides I/O to the rear panel and is the
source of the 10-MHz (CLK10) system clock.
The PC controller features a Pentium 133-MHz processor with either 16 or
32 MBytes of EDO DRAM, 256 KBytes of L2 cache, and 512 KBytes of
flash-based BIOS.
A Cirrus Logic PCI-to-PCMCIA/PC CARD Host Adapter ASIC controls the two
PC card slots.
A Cirrus Logic Viking display controller with 1 MByte of DRAM supports the
flat-panel display and an external SVGA port.
One ECP/EPP Centronics-compatible parallel port and two 16550-based serial
RS-232 COM ports (one external) support standard PC-based I/O peripherals.
A Tektronix-designed ADG343 CMOS ASIC manages the PCI-to-backplane
interface, supporting DMA transfers with FIFO, IRQ management, program-
mable byte swapping, address space management/windowing, bus arbitration,
and MODID control lines.
A Tektronix-designed ASIC manages the trigger lines, cross-connecting any of
the 10 backplane trigger lines (ECL and TTL) to any of the four BNC ports on
the rear I/O panel of the mainframe. The VTC ASIC supports several standard
Power Supply
Backplane
Controller Board