1. COCO - Session #19 Today: Get to know the Logic State Analyzer
Build the counter that you designed in Session #18, and test it
- Hardware building activity
- Display your results on the analyzer

2. Logic State Analyzers
a tool for observing logic states of multiple signals at once, in time
A logic probe can show only one bit at a time.
Extremely useful tool for testing and debugging sequential circuits!!

3. Summary Hardware version of the “timing window” on LogicWorks
Capture, store, and display up to 16 time-varying signals simultaneously
Variety of ways to start/stop capture
Make time and frequency measurements
e.g., circuit delay measurements, setup and hold times
Detect glitches
More info on web
Manuals available in lab cabinet

4. HP54620A Specifications up to 500 million samples/sec
sweep speeds of 5ns/div to 1 s/div
about 2K bytes of data storage
minimum detectable glitch 3.5ns
Timebase accurate to 0.01% of reading
can be interfaced with PCs and other instruments
can print data

5. DISPLAY
16-BIT SIGNAL INPUT
These cables are stored
behind the screens.
MICRO
GRABBERS
POWER SWITCH
PROBE LEADS

6. CHANNEL CONTROLS
Select Channel
Assign Labels
Set Position
HORIZONTAL
CONTROLS
Adjust timing

7. GENERAL CONTROLS
Measuring time
Saving
Display and print
“SOFT KEYS”
Their functions change with context

8. TRIGGER KEYS
Specify kind
of triggering
(edge/pattern/…)
TRIGGER
INPUT/OUTPUT
External trigger signal
Signals to trigger external systems

9. The Screen 0 Out 1 A 2 B Ext _ Sampling @ 16ns GL 0.00s 2.00 µs/ RUN
16ns GL
0.00s
2.00 µs/
RUN
0 Out
1 A
2 B
Activity = 15 _ _ _ _ _ _ _ _ _ _ _ _ _ 0
Ext _
Source
Edge
0 Out
E Trg In

10. Delay Sampling Interval Glitch Mode
16ns GL
0.00s
2.00 µs/
RUN
0 Out
1 A
2 B
Activity = 15 _ _ _ _ _ _ _ _ _ _ _ _ _ 0
Ext _
Source
Edge
0 Out
E Trg In

11. Time/div Trigger Condition Acquisition Indicator
16ns GL
0.00s
2.00 µs/
RUN
Acquisition
Indicator
0 Out
1 A
One “Division”
2 B
Activity = 15 _ _ _ _ _ _ _ _ _ _ _ _ _ 0
Ext _
Source
Edge
0 Out
E Trg In

12. 0 Out Move these using the cursor control knobs 1 A Memory Bar Soft
16ns GL
0.00s
2.00 µs/
RUN
0 Out
Move these
using the
cursor control
knobs
1 A
Memory
Bar
Soft
Keys
Measurements
2 B
Activity = 15 _ _ _ _ _ _ _ _ _ _ _ _ _ 0
Ext _
Source
Edge
0 Out
E Trg In

13. Questions? Manuals are in the cabinet! 0 Out 1 A 2 B Ext _
16ns GL
0.00s
2.00 µs/
RUN
0 Out
1 A
Manuals are in the cabinet!
2 B
Activity = 15 _ _ _ _ _ _ _ _ _ _ _ _ _ 0
Ext _
Source
Edge
0 Out
E Trg In

14. Please do the Activity Now
Remember that the logic analyzer is a delicate instrument. Handle it gently. Don’t force anything!!
Build and test the fancy counter that you developed in the previous class with JK Flip Flops (74LS109) using real TTL hardware
Display the output of your circuit on the HP logic state analyzer