Keysight EXG and MXG X-Series Signal Generators User’s Guide 449
Using the N5102A Digital Signal Interface Module for N5172B/82B with Option 003/004 and
653/655/656/657
Operating the N5102A Module in Input Mode
4. Press the Clock Phase softkey.
From the menu that appears, the phase of the clock relative to the data can be changed in 90
degree increments. The selections provide a coarse adjustment for positioning the clock on the
valid portion of the data. Selecting 180 degrees is the same as selecting a negative clock
polarity.
The 90 degree and 270 degree selections are not available when the clock rate is set below 10
MHz or above 200 MHz. If 90 degrees or 270 degrees is selected when the clock rate is set
below 10 MHz or above 200 MHz, the phase will change to 0 degrees or 180 degrees,
respectively.
5. Enter the required phase adjustment.
6. Press the Return softkey to return to the clock setup menu.
7. Press the Clock Skew softkey.
This provides a fine adjustment for the clock relative to its current phase position. The skew is
a phase adjustment using increments of time. This enables greater skew adjustment capability
at higher clock rates. For clock rates below 25 MHz, this softkey is inactive.
The skew has discrete values with a range that is dependent on the clock rate. Refer to “Clock
Timing for Phase and Skew Adjustments” on page 429 for more information on skew settings.
8. Enter the skew adjustment that best positions the clock with the valid portion of the data.
Table 17-8 Clock Source Settings and Connectors
Clock
Source
Softkeys N5102A Module Connection
Reference
Frequency
Clock Rate
1
1. For the Internal selection, this sets the internal clock rate. For the External
and Device selections, this tells the interface module the rate of the
applied clock signal.
Freq
Ref
Ext Clock
In
Device
Interface
External l l
Device l l
Internal
2
2. There should be no clock signal applied to the Ext Clock In connector
when Internal is being used.
ll l
The clock phase and clock skew may need to be adjusted any time the
clock rate setting is changed. Refer to “Clock Timing for Phase and Skew
Adjustments” on page 429.
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