Circuit Board Design
5
Soft Touch Pro User’s Guide
67
Clock input
The same choices exist for the clock input on the E5405A
differential probe as outlined above for the data inputs. The
clock input has a separate, independent threshold
adjustment.
E5402A and E5406A-pro series single-ended soft touch probes
Clock input
The clock input to the E5402A and E5406A probe is
differential. If you supply a differential clock, you should
select the "differential" option in the clock threshold user
interface.
If your system uses a single- ended clock signal, the clock
input should be either grounded or connected to a dc power
supply. You may:
•
Ground the clock input and adjust the clock threshold
from the user interface to between - 3V dc and +5V dc.
Signal Access
Labels split across probes
If a label is split across more than one pod, this leads to
restrictions in triggering. Refer to "Triggering with the
Agilent 1675x and 1676x" (Agilent publication number
5988- 2994EN) for more details.
Reordered bits
If bits need to be reordered within a label, this leads to
additional restrictions in triggering. Specifically, equalities
can be used to evaluate the value of a label with reordered
bits, but inequalities cannot be used. You may be able to
avoid the need to reorder bits in a label by routing signals
