Tektronix TLA715 Series, Руководство по обслуживанию

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Theory of Operation
3- 2
TLA715 Dual Monitor Portable Mainframe Service Manual
The controller uses a standard Intel Pentium III microprocessor using the 815E
chip-set. The controller has a 733 MHz Pentium III processor with up to 512 MB
of SDRAM, 16 KB of Li instruction cache, 16 KB of LI data cache, 256 KB of
L2 cache, and 8 MB of flashed-based BIOS.
A ECP/EPP Centronics-compatible parallel port, two USB ports, and two
16550-based serial RS-232 COM ports (one external) support standard PC-based
I/O peripherals.
A Silicon Motion Lynx3DM SVGA/XGA display controller with up to 4 MB of
internal DRAM supports the flat panel LCD display and an external SVGA port.
The 815E chip-set provides and additional SVGA/XGA output port.
The backplane interface appears as a standard PCI device to the PC-based
controller. The PCI-to-Backplane interface is managed by a Tektronix-designed
ADG343 CMOS ASIC which includes support for DMA transfers with FIFO,
IRQ management, programmable byte swapping, backplane address space
management and windowing (A16, A24, and A32 space), backplane arbitration,
and MODID control lines.
The backplane trigger lines are managed by the Tektronix-designed Backplane
Trigger Crossbar (VTC) ASIC. The VTC ASIC cross-connects any of the ten
trigger lines (ECL and TTL) to any of the four BNC ports on the rear I/O panel
of the mainframe. The four BNC ports accommodate two inputs (System Trigger
In and External Signal In) and two outputs (System Trigger Out and External
Signal Out). The VTC ASIC also supports several standard trigger protocols
(including START/STOP protocol), which support a synchronous start of all
modules to System Time Zero (STZ), and several custom features including time
interpolation to support the VTC ASIC in individual module applications.
The backplane supports up to four single-wide slots, where most modules require
two slots. The backplane connects the power supply to the rest of the instrument.
It also distributes the 10 MHz system clock and supports all communication to,
from, and between the modules, including real time intermodule communica-
tions.
The front panel interface assembly interacts with the system controller, LCD flat
panel display, floppy disk drive, front panel keypad and trackball, USB ports,
mouse, and keyboard. Dual 50-pin cables connect the front panel interface board
to the internal slot-0 controller. The interface also supplies a speaker for the PC.
Backplane
Front Panel Interface