Introduction to Segmented Memory Acquisition Function

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.
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.
Figure 2: Graph of Segmented Memory Function
How to execute the segmented memory function on GDS-2000A
oscilloscope?
Please refer to figure 3, first of all, select the “Acquire” bottom at
upper-right hand side, then select the “Segments” button at the bottom
of the screen, then subsequently turn on the “Segments ON” Function.
After choosing the triggering condition and the measure parameters,
then set the number of segment sections, which can be divided into
2048 as the maximum, at the upper-right hand side of the screen.
Finally press the “Segment RUN”, then when finish capturing the
waveforms, press “Segment STOP”. Choosing the “Current Seg” at the
upper-right hand side of the screen, the burst signal in each memory
segment can be easily observed. As can be seen in Figure 4, due to the
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.
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. Press the “Option” Key at the bottom-right hand side
of the screen to turn on the Logic Analyzer, then turn on the 0-7 channel
display.
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.
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.
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. Press the “Current Seg” at the upper-right hand side on the screen,
then users can adjust the anticipated segments by rolling Variable knob.
Observe the segments
10. Or press the “Play/Pause” button to run the automatic search
function within segmented waveforms.
Using “Play/Pause” key
to find the waveform in
different segments