Technical data

This command calls “SENSe[1]:EYE:TCENter[?] ” on page 242. It has no

functionality of its own.

SENSe[1]:EYE:TCENter[?]

IAgilentN490xEDSamplingClockDataAlignCenter

IAgilentN490xEDSampling.ClockDataAlignCenter (IVI-compliant)

SENSe[1]:EYE:TCENter ONCE | 0 | 1 | OFF | ON

SENSe[1]:EYE:TCENter?

This command initiates a search for the value of data/clock delay that puts the

active clock edge in the center of the data eye, midway between the two relative

delay points with a measured BER just in excess of the BER configured by the

EYE:THReshold command. If successful, the command leaves the data/clock delay

at this value and the center of the eye can be found by querying the data delay

value. If unsuccessful, EYE:WIDth? will return 9.91E+37 (Not-A-Number, NAN).

The command :TCENter OFF aborts a previously started search.

N O T E

The clock/data align feature (used to center the sampling point in the data input

eye) uses information derived from the input clock frequency.

For the clock/data align feature to work properly, the input frequency must be stable

during the measurement. The frequencies at the start and end of the measurement

are compared, and if they differ by more than 10%, the measurement fails.

When a source clocking the instrument changes frequency, it will take time for the

instrument to sense the change and adjust its configuration. Refer to the sections

dealing with clock stabilization to ensure that the instrument's configuration has

stabilized following any change of frequency prior to performing a clock to data

alignment.

There is no need to alter the sync-mode before or after a clock to data alignment

procedure, as AUTO sync-mode is automatically configured for the duration of the

procedure.

N O T E

The command :TCENter is an overlapped command. See the Serial BERT

Programming Guide.

5 SCPI Command Reference

242 Agilent J-BERT N4903B High-Performance Serial BERT

Description

IVI-COM Equivalent

Syntax

Description