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Reference
3-24 GB1400 User Manual
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