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Theory of Operation
TLA721 Benchtop & TLA7XM Expansion Mainframe Service Manual
3- 3
An ECP/EPP Centronics compatible parallel port, two USB ports, and two
16550-based serial RS-322 COM ports (one external) support standard PC-based
I/O peripherals.
The backplane bus 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 control
lines, and MODID control lines.
The trigger lines are managed through the Tektronix-designed Trigger Crossbar
(VTC) ASIC. The VTC ASIC cross connects any of the ten backplane trigger
lines (ECL and TTL) to any of the four SMB connector ports on the front panel.
The logic analyzer uses four SMB ports to 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 backplane protocols including
START/STOP, which support a synchronous start of all installed modules to
System Time Zero (STZ), and several custom features. These features include
time interpolation to support the use of the VTC ASIC in individual module
applications.
The Adapter board integrates the TLA715 Portable Mainframe controller into the
TLA721 Benchtop Mainframe controller by providing electrical and mechanical
support for the controller board, floppy disk drives, keyboard and mouse ports,
PC speaker, decoding of additional MODID lines via an FPGA, and buffering of
the backplane signal lines to comply with VXI System Specification 1.4 and
VMEbus ANSI/IEEE Std 1014-1987 standards.
The hard disk drive board provides electrical and mechanical support for the hard
disk drive and the CD-ROM drive.
The hard disk drive (HDD) is a standard 2.5-inch IDE drive which interfaces
directly to the controller through the Enhanced Integrated Device Electronics
(IDE) interface. The hard disk drive is easily replaceable without removing any
of the covers or screws on the controller.
The hard disk drive is only available in the maximum configuration. The sizes of
the hard disk drive are dependent on the current cost and availability. The
benchtop controller is electrically capable of accepting dual master/slave IDE
HDD configurations for a total of three hard disk drives (however the CD-ROM
takes one of the configurations) but is currently limited to mounting two hard
PCI-to-Backplane Bridge
ASIC
Trigger Crossbar ASIC
Adapter Board
Hard Disk Drive Board
Hard Disk Drive
Summary of Contents for TLA7XM
Page 5: ......
Page 13: ...Table of Contents viii TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 17: ...Service Safety Summary xii TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 21: ...Preface xvi TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 25: ...Introduction xx TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 43: ...Specifications 1 18 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 85: ......
Page 87: ...Adjustment Procedures 5 2 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 161: ...Repackaging Instructions 6 74 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 165: ...Electrical Parts List 8 2 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 169: ...Diagrams 9 4 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...
Page 189: ...Mechanical Parts List 10 20 TLA721 Benchtop TLA7XM Expansion Mainframe Service Manual ...