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Introduction to Segmented

Memory Acquisition

Function

Packet-burst signal can be commonly seen in various embedded

electronic product design and processing signals from radar antenna. For

instance, the communications between chipsets, I2C signal is definitely

the burst signal. Since the burst idle period is quite long when using

oscilloscope to capture this packet-burst signal, whenever users want to

observe more packet signal, the requirement of longer memory length

needed to be equipped in the oscilloscope. Though the time-base range

can be expanded, however, it relatively sacrifices the speed of the

sampling rate. When users temporarily narrow down the time-base

range to capture the signal, this may result in the incapability of

observing waveforms in details.

GDS-2000A Oscilloscope offer segmented memory function. With similar

trigger condition, the whole memory length can be split up and can be

used with efficiency and accuracy, which can save more idle memory and

the memory can be divided into 2048 sections as the maximum. The

maintenance of higher sampling rate can be processed even the signals

are measured within segmented memory. After capturing the waveforms,

the problems can still be examined precisely in details.

Take figure 1 for example, the traditional oscilloscopes take advantage of

abundant memory space to capture the burst signals and the time-base

need to be extended. However, the cost of longer memory is extremely

high, thus, the idle of burst signal is always a waste for the memory

space and only few waveforms can be observed.

Summary of content (8 pages)

PAGE 1
Introduction to Segmented Memory Acquisition Function Packet-burst signal can be commonly seen in various embedded electronic product design and processing signals from radar antenna. For instance, the communications between chipsets, I2C signal is definitely the burst signal.
PAGE 2
Figure 1: Graph of Capturing Burst Signal of Traditional Oscilloscope As can be seen from figure 2, the segmented memory function take advantages of the memory space with efficiency. The burst signal will be split and captured into different memory sections under the same trigger condition. It is about maintaining the high sampling rate and sustaining the original integrity of waveforms.
PAGE 3
maintenance of high sampling rate, the range of time-base can be narrowed down to process the waveform observation in details without distortion. Figure 3: How to Implement Segmented Memory Function on GDS-2000A Figure 4: The Implement Result of Segmented Memory Function.
PAGE 4
Standard Demo Procedure of Segmented Memory Function Equipments: 1. GDS-2000A Digital Storage Oscilloscope + Logic Analyzer Selected Module * 1 2. GDB-03 Demo Board *1 3. Digital Probe *1 Steps/ Procedures: 1. Connect the digital probes with GDB-03 Demo Board via the connection port of Logic Analyzer on GDS-2000A. The connect point on GDB-03 。 2. Adjust the function adjusting knob of GDB-03 demo board to “SPI” function selection.
PAGE 5
Adjust the knob to “SPI” function 3. Press the “Menu” button at the right-hand side of the oscilloscope to set the bus mode as trigger condition. Set the trigger mode as Bus Mode 4. Press the bus decoding button at the middle of oscilloscope to set the decoding mode as bus mode.
PAGE 6
Set bus decoding mode 5. The events of interest can be moved to the middle position by pressing the horizontal adjustment button, then set the Time/Div horizontal time range to 50us/div. Set Time base to 50us/div 6. Press the “Acquire” button at the upper-right hand side of oscilloscope to turn on the segmented memory function.
PAGE 7
. Press the “Select Segments” button at the bottom of the screen, then choose the interval range of each segment from “Num of Seg” on the right-hand side of the screen. If users want to choose the maximum segments, 2048 sets, they may press “Set to Maximum” button to set up the 2048 sets as maximum. Set Segments to maximum “2048” 8. Press the “Segments Run” button at the bottom of the screen, then the oscilloscope will run the test within segments; after the measurement, press “Segments Stop”. 9.
PAGE 8
Observe the segments 10. Or press the “Play/Pause” button to run the automatic search function within segmented waveforms.