Chapter 4. State Measurements; Introduction; Capturing A State Trace - HP 1630A Operating And Programming Manual

Model 1630A/D/G
State Measurements
INTRODUCTION
CAPTURING A STATE TRACE
Chapter 4
State Measurements
The 1630A/D/G Logic Analyzers are capable of capturing large quantities of data . To make this data useful, the
incoming data needs to be formatted in an arrangement that is easily comprehensible . This is accomplished
with the 1630A/D/G analyzers by grouping the incoming lines and labeling the groups for the typical
connections for the address, data, status, and other lines of interest . Incoming data may be further identified
by assigning user defined labels for conditions rather than the provided bases of hexidecimal, binary, or
ASCII . Another type of user base may be assigned in which relocatable code is labeled by the user .
The next step in making the captured data useful is to edit the data before it is stored by the analyzer . Selective
tracing techniques are used for recognizing and storing only qualified data . The 1630A/D/G Logic Analyzers
provide a trace specification menu in which resource terms may be identified for selective tracing . Resource
terms may be specified for simple triggering, sequence triggering, sequence restart, and store qualifying .
The target system used throughout this manual for examples is the HP Model 5036A Microprocessor Lab
which contains an 8085 microprocessor . All traces shown in the figures are from the 5036A.
1 . Make all the required connections to the target system . Information for connecting the probes, directly
or through an interface, is in chapter 2 of this manual .
2. Apply operating power to the logic analyzer and to the target system .
NOTE
When using a preprocessor, be sure to apply power to the analyzer first or the
target system may not run .
The logic analyzer will execute power-up sequences and display the system menu in the default
configuration . The 1630G will also display messages indicating what is being loaded from internal
storage when it has been instructed to load internal configurations or an inverse assembler. See Power-
up Display Messages in chapter 2 for more information on the power-up sequence and messages . The
default system configuration assigns all channels to state measurement and none to timing
measurements . Figures 4-1a and 4-1b are the default System Specification menus for the 1630D and
1630G . The 1630A default System Specification menu has eight less channels than the 1630D . Power-
up display messages will appear on the display only when the analyzer is powered up .
3. Press RUN. The logic analyzer will execute a single trace and display a State Listing in hexadecimal. The
measurement ensures the logic analyzer is connected to the target system and the target system is
running . Figures 4-2a and 4-2b are examples of the state traces that will be displayed when collecting a
free-run trace with the logic analyzer . The State Listing for the 1630G has more columns than the
1630A/D because it has more state channels and a counting function .