Tektronix 071-0590-00 Input Data Delay, Controls, Use of the Display, Procedure to Add Delay

Reference

Controls

The INPUT section controls that are used to set up input parameters are:

DELAY key

V-TERM key

V-THRESH key

INPUT (−, ↓) Keys

D-INV key

In addition, the state of the F2 and F3 function keys determines the action of the INPUT up/down keys as shown in the table below. Note that this function of the F2 and F3 keys does not apply while the Analyzer is in the Menu mode.

Table 3-6. How F2 and F3 Determine Which Input Can be Set Up

F2	F3	Input that can be adjusted
		using (− ,↓ ) Keys
off	off	DATA
on	off	CLOCK
off	on	REF DATA
on	on	not allowed

Use of the Display

The Analyzer display will normally show the currently selected delay or termination parameter in the bottom left field and the currently selected voltage threshold parameter in the bottom right field. In addition the bottom middle field will show whether or not input data inversion is enabled. Specifically, if the INVERT DATA key is on, then the message INV will appear after the name of the current pattern, for example PN 23 INV.

Input Data Delay

Up to 4 ns of delay can be added to the DATA and REF DATA inputs to adjust their phase alignment with the input clock signal. A different amount of delay may be added to each of these inputs so that the Analyzer can accommodate different phase relationships between DATA, REF DATA, and CLOCK.

Procedure to Add Delay

1.Select either the DATA or REF DATA inputs using the F2 and F3 keys. Enable F3 to select REF Data. Disable F2 and F3 to select DATA.

2.Press the DELAY key. Verify that its LED turns on.

3.Press the input up/down keys while observing the amount of added delay in the bottom left field of the display. Delay may be set in the range 0 to 4 ns, in 5 pS steps for DATA or in 100 pS steps for REF DATA.

The delay value shown in the display is in effect immediately. In other WORDs, delay is changed each time you press the up or down key. Note that delay is an

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