AORM
Advanced Optical Recording Measurement Package
Real Time Evaluation of CD/DVD Channel Signal Processing
A Precise, Accurate Characterization Tool
The AORM software package is now available in the new-generation high performance DSOs
(WaveMaster®,
WavePro®,
SDA, and DDA Series). In addition to all the ORM/AORM features supplied in legacy scopes for nearly ten years, the AORM option in our new-generation X-Stream DSO environment provides a completely updated user interface and improved debug tools written to support
ever increasing read/write data rates and larger media capacity required for the latest CD and DVD implementations. Typical applications include game box technology and high-capacity DVD Read/Write.
The unique combination of deep acquisition memory available in LeCroy DSOs and the flexibility of AORM in adapting to optical recording standards provides the user with ultimate measurement accuracy and 2-dimensional
correlation of recording parameters.
CD and DVD Channel Emulation
In AORM, channel emulation enables real-time signal processing in software. Responding to innovations in optical disk drive technology, LeCroy DSOs feature a software package designed to interface with existing CLV (constant linear velocity) type systems as well as new CAV (constant angular velocity) type systems used for hard disk drive and high-speed CD-ROM applications. AORM is also compatible with ZCLV (zoned constant linear velocity) systems used in DVD drives.
This figure depicts a block diagram of signal processing in optical disk drive. AORM software extracts baseline fluctuation and slices the RF signal to generate a binary signal. Then the software PLL extracts clock content from the incoming binary signal, and the decoder decodes from binary signal timing referred to the clock.
Histogram, Trend, and XY Parametric Views
As hardware designers are quick to recognize, measurement results often need to be summarized and tabulated for quick interpretation. DSO technology further enhances AORM functionality:
XY Plot displays the X-Y relationship between any two parameter trends
(In this case, ptop and pwid)
View Options
-
Parameter – the source trace(s) will be displayed along with the custom parameters.
-
nT Table – the source trace(s) will be displayed along with the nT Table display.
-
Histogram – the histogram of the selected parameter is shown.
-
Trend – the trend of the selected parameter is shown.
-
XY Plot – plots the trend of the selected measurement vs. either the trend of t@pit or pwid, as appropriate.
User-defined histogram bins display the distribution of
pwid parameter in distinct
population groups.
Characterization of ISI
Characterization of ISI using edge shift parametric measurements vs. pit or space pair was once a tedious, time-consuming process until the introduction of ORM about ten years ago. AORM brings to X-Stream DSOs all the functionality of ORM, long regarded as the standard for optical disk recording software.
3.125
Gb/s XUAI signal measured with system using a probe
with good frequency flatness, but excessive loading.
Technical Specifications
| PARAMETER DEFINITION TABLE |
Timing Analysis Parameters
| deltap2c |
Data edge shift referred
to clock |
| deltap2cs |
Standard deviation of deltap2c |
| edgsh |
Pit or space width difference
from ideal value |
| period |
Period of each cycle of clock
|
| pnum |
Number of pit or space pair
|
| pwid |
Width of pit or space pairs
|
| t@pit |
Delay of pit or space from trigger |
| timj |
Standard deviation of edgsh |
| - |
-
|
|
Amplitude Analysis Parameters
| paa |
Average amplitude of RF signal |
| pasym |
Asymmetry of RF signal
|
| pbase |
Base of pit or space
|
| pmax |
Maximum of pit or space
|
| pmidl |
Middle voltage of pit or space |
| pmin |
Minimum of pit or space
|
| pmoda |
Modulation
of RF signal
|
| pres |
Resolution of RF signal |
| ptop |
Top of pit or space
|
|
Ordering
Information
| |
Product
Code |
| Advanced Optical Recording Measurement Package |
AORM* |
| Retrofit Kit for AORM Measurements Package for existing ORM customers |
RK-AORM |
*For WavePro 7200/7300, WaveMaster, SDA, and DDA Series oscilloscopes.
|
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