Triggering On A Timing Event; Figure 6-4. Selecting Waveform Positions On Display - HP 1630A Operating And Programming Manual

Model 1630A/D/G
Timing Measurements
Triggering On A Timing Event
2. Press the TRACE key.
Timing Waveform Diagram--------- INSERT to Add Traces --__________
-I-
Sample Period
Magnification
Magnify About
Cursor Moves
f 1 1 0
100 .0 nSidiu
10 .00 nSiclk
6 .310 NS o to x
Figure 6-4. Selecting Waveform Positions On Display
1 . Find a point on the waveform display where two of the channels are high at the same time that one of the
other channels has a transition from low to high (change display magnification, if necessary) . Write
down these three channel numbers and their conditions .
3. Use the CURSOR keys to place the cursor in the row of X's in the Pattern field . This is an AND field . Its
default state is all don't cares. All "1" or "0" specifications that you enter in this field must be met during
the same clock period in order for the timing analyzer to recognize its trigger.
4. Use the CURSOR keys to place the cursor at the points in the Pattern field which correspond to the bits
that you noted as having high states . Enter a "1" from the keyboard in each of these two bits . (BO is the
first bit on the right-hand side of the field .)
5 . Use the CURSOR keys to place the cursor in the Edge field. The Edge field is an OR field. You can
specify recognition of low-to-high transitions, high-to-low transitions, or both transitions in any of the
bits where such selections are available. If any of the selected transitions occurs in any bit during a clock
period, the entire field is satisfied .
6 . Use the CURSOR keys to position the cursor on the point in this field corresponding to the bit you noted
as having a low-to-high transition (BO is on the right-hand side) .
7. If there is a dot in the field where you positioned the cursor, press the NEXT[] key onetime to obtain the
rising-edge arrow. If there is an N/A (not available) notation in this field, you will have to return to the
WFORM display and select new channels, a different one with a low-to-high transition and two other
channels that are high, if required . Edge recognition is not available for all of the timing bits . See figure
6-5.