Basic Digital Operation

Triggering Waveforms

Polarity determines the state of the trigger to which the waveform responds (used only with an external trigger source); you can set either negative, or positive.

Source

The Trigger hardkey

A command sent through the rear-panel GPIB, LAN, or Auxiliary (RS-232)interface

An external trigger signal applied to either the PATTERN TRIG IN connector, or the PATT TRIG IN 2 pin on the AUXILIARY I/O connector (connector locations are shown in Figure 1-3 on page 18).

The following parameters affect an external trigger signal:

• The source (Input connector) of the external trigger signal (see page 104)

• The polarity of the external trigger (described on page 105)

• Any desired delay between when the PSG receives an external trigger and when the waveform responds to it (see page 104).

Mode and Response

The arbitrary waveform player provides four trigger modes; each mode has one or more possible responses:

Single plays the waveform once. Arb formats have the following retriggering options:

Off ignores triggers received during play; a trigger received after playback completes restarts the playback.

On causes a trigger received during play to repeat the waveform after the current play completes.

Immediate causes a trigger received during play to immediately restart the waveform.

Gated causes the waveform to wait for the first active trigger signal state to begin transmission, then repeatedly start and stop in response to an externally applied gating signal (example on

page 105). You select the active state with the Gate Active Low High softkey (see page 105).

In an ARB format, the waveform plays during the inactive state, and stops during the active state.

In real- time Custom, behavior depends on whether the signal incorporates framed or unframed data.

Because the PSG provides only unframed data, to transmit a framed data signal you must create an external file that incorporates the framing and download it to the PSG (see the E8257D/67D PSG Signal Generators Programming Guide).

Unframed data transmits during active states, and stops during inactive states. The signal stops at the last transmitted symbol and restarts at the next symbol.

Framed data starts transmitting at the beginning of a frame during active states, and stops at the end of a frame when the end occurs during inactive states. If the end of the frame extends into the next active state, the signal transmits continuously.

Chapter 3

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Agilent Technologies E8257D PSG, E8267D PSG manual Source, Mode and Response

E8267D PSG, E8257D PSG specifications

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