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Operating Basics
CPU Unit
The CPU unit controls the instrument and includes read only memory (ROM),
random access memory (RAM), and an input/output (I/O) interface.
The ROM memory holds the program code that implements all the supported
functions. The ROM contents are loaded at the factory.
The RAM memory holds a variety of information required by the CPU. The
contents of RAM change according to the instrument's operating state. The
contents of RAM are retained by a built-in battery even when the instrument is
turned off. The main instrument settings will still be in effect the next time the
instrument is turned on. The pattern data memory and the sequence data
memory, which are described later as a conceptual data model, are actually stored
in one section of this RAM.
External interfaces include GPIB and RS-232 interfaces for remote control, a
floppy disk drive controller, and a user interface consisting of the display and the
front panel.
Pattern Generation Unit
The pattern generation unit generates digital pattern signals based on the pattern
data and sequence data specified by the user. This unit includes a pattern control
circuit, pattern memory, and sequence memory.
Pattern memory and sequence memory are high-speed memories that hold the
pattern data and sequence data, which are described later in this section. These
memories supply pattern data to the pattern control circuit.
Clock Unit
The clock unit provides the clock signals that generate the data patterns and
detects and synchronizes external trigger signals.
The data generator uses the phase-lock-loop (PLL) circuit when generating the
clock signals. This provides an output with excellent frequency precision.
Output Channels
The output channels provide variable output levels and digital signals to the
device under test.
The output channels level-convert the pattern signals from the pattern generation
unit to output signals appropriate for the device under test. They also handle fine
adjustment of specific bit timing.
Display and Front Panel
The user interface consists of the display and front panel.
The display is a 16-level monochrome 640 × 480 pixel CRT. The front panel
consists of menu buttons, numeric keys, bezel buttons, a general-purpose knob
for changing numeric values and item selection, and several signal output
connectors.
2 9
DG2040 Data Generator
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