HP 1630A User Manual

Model1630A/D/G

Performance
Analysis Measurements
INTRODUCTION
Chapter 5
Performance Analysis Measurements
As the software begins to push the limits
of the hardware of a system, the need for more efficient code becomes
much more apparent . The software must
be able to respond to all of its inputs in a timely fashion,
with little
or
no delays . Performance Analysis
allows the programmer to analyze code-to find bottlenecks and
inefficiencies . The Overview Measurements of the
1630
series logic analyzers (available in the state-only
configuration) provide the programmer with tools
with which to perform this analysis . These tools
allow the
programmer to analyze module processor usage, intermodule
linkage, module
duration, and time-based
interaction .
The output of these tools appear as bar graphs (called histograms) relating the relative actions between
measured items . These histograms are presented in the chart menu after the trace specification has been set
up for
an
overview measurement .
With the exception of the Time Positional measurement, these
measurements execute in a continuous random
sample mode . A sample consists of 1024 qualified
states . The
time between states varies randomly to insure random sampling .
To stop
a measurement immediately, press
the STOP key twice . The first press will force the analyzer to take one more sample and then quit . Two
consecutive
STOPs will force the analyzer
to abort the current sample .
The following chapterdescribes the overview measurements, and provides example usages of these
measurements .
The 1630A/D analyzers can show two types of histograms
:
state
label histograms
and time interval histograms .
The 1630G analyzer can show two types of state label histograms (counting states or program activity), time
interval histograms, time position histograms and linkage histograms .
STATE LABEL OVERVIEW
MEASUREMENT
State Label Overview Measurement allows the programmer to define module code ranges and then compute
the amount of
time
spent
within these
modules, relative to each other, or relative to the entire system software .
The ranges are defined for one of the eight possible labels
defined in the
format menu . (For a typical inverse
assembler application, these wouldbe ADDR, DATA, and STAT .) The ranges may be defined as any locations
between the maximum and minimum values possible for that label .
State Label
Measurement
is
very
beneficial in improving overall system performance . It
allows the
programmer to define sections of code critical to the overall
system or module performance, and
thereby avoid
wasting time attempting to optimize code that
does not noticeably affect overall
performance
.
For example,
a
module that performs floating point
processing is found to be noticeably
slow . The floating
point module consists of seven routines : F_ADD, F_SUB,
F_MUL,
F_DIV, F_CMP, F_MOVE, and F_NORM .
These routines provide floating point addition, subtraction, multiplication, division, comparison, moves, and
normalization . To improve the module performance, the individual routines are defined in the State Label
Trace menu, and then analyzed, as in the following steps .

HP 1630A Specifications

General

Brand	HP
Model	1630A
Category	Measuring Instruments
Language	English

Summary

General Information

Introduction

Overview of the manual's purpose and content.

Analyzer Description

Detailed explanation of the HP 1630A/D/G logic analyzer's features.

State Analysis

Describes the state analysis function of the logic analyzer models.

Timing Analysis

Details the timing analysis capabilities of the logic analyzer systems.

Installation

Power Requirements

Specifies the electrical power source requirements for the logic analyzer.

Self-Test

Outlines the analyzer's self-test routine and troubleshooting information.

Connecting Analyzer To Target System

Provides procedures for connecting the analyzer to a system under test.

Front Panel Controls and Menu Map

Front Panel Controls

Explains the function of each key on the logic analyzer's front panel.

Input/Output Displays Menu Map

Illustrates the available menus and navigation paths for displays.

State Measurements

Capturing A State Trace

Step-by-step guide on acquiring state data from a target system.

The State Format Specification

Details how to set up data display formatting for state analysis.

The State Trace Specification

Defines parameters for starting, stopping, and qualifying state traces.

Sequential Triggering

Explains how to trigger based on a sequence of events in the state stream.

Performance Analysis Measurements

State Label Overview Measurement

Analyzes module code ranges and time spent within them using histograms.

Time Interval Overview Measurement

Measures time spent within routines or between transition points using histograms.

Time Positional Measurements

Provides histograms of event occurrences over a specified time period.

Timing Measurements

Triggering

Details methods for triggering timing measurements based on patterns or edges.

The Timing Format Specification

Covers setting up label and threshold assignments for timing data.

The Timing Trace Specification

Defines parameters for single or continuous timing traces.

Waveform Displays

Describes how timing data is visualized in waveform format.

Interactive State And Timing Measurements

Interactive State/Timing Triggering

Details how master and slave analyzers coordinate triggers.

Executing Coordinated Measurements

Outlines procedures for performing combined state and timing measurements.

The Peripherals Menus

[PERIPHERALS] SYSTEM CONFIGURATION

Configures analyzer interaction with peripherals and system settings.

1630A/D System [Peripherals] Specification Menu

Specifies settings for the 1630A/D peripherals.

1630G System [Peripherals] Specification Menu

Specifies settings for the 1630G peripherals.

Using HP-IB Or HP-IL Interface

HP-IB and HP-IL Interface Capabilities

Lists implemented HP-IB and HP-IL interface functions.

Keyboard Mnemonics

Explains device-dependent commands using mnemonic-per-keystroke format.

Data Formats

Details various data formats used in learn strings.

Display Messages

Introduction

Lists and defines status, error, and prompt messages.

Error Messages

Provides definitions for various error messages encountered.

An HP-IB Overview

HP-IB System Terms

Defines terms and concepts for HP-IB system operations.

Message Concepts

Classifies the twelve message types for the HP-IB.

Using A Printer

Obtaining Hard Copy From A Printer

Provides steps to connect a printer and obtain hard copies of displays.

Using The Disc Memory Accessory

The Storage Operations Menu

Details the options for storing and loading files on disc.

How To Read A Disc File

Instructions for loading files from a disc into analyzer memory.

Using The Tape Memory Accessory

How To Use Tape Memory Accessory

Guide to using the digital cassette drive for storing and loading data.

Safety

Warranty

Outlines the product warranty terms and conditions.

Limitation of Warranty

Specifies conditions under which the warranty does not apply.

Microprocessor Preprocessors

Inverse Assembly

Describes software that translates microprocessor instruction sets to mnemonic form.

Custom Design Interfaces With User-definable Interface Module

Discusses custom interface modules for specific designs.

General Specifications

Microprocessor Specifications

Lists specifications for supported microprocessors.

Environmental

Details operating temperature, altitude, and humidity ranges.

Bus Preprocessors

The HP 10342B Bus Preprocessor Provides

Lists features of the HP 10342B bus preprocessor.

Inverse Assembly

Describes the function of the inverse assembler software.