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Forums > Silicon-package-board > Signal Integrity and Modeling

Subject: EMC classes(1-5) in emc_checker
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Saad
Posts: 39
Online: User is Offline
10/20/2005 6:31 AM  
Hi,

Does anybody know where can I find detailed information on class(1-5) as used in 'emc rule checker' in Allegro?
Also, do they have any connection with industry standards like ClassA,ClassB...

I'll appreciate any help.

Thanks,
Saad.
rbennett
Posts: 27
Online: User is Offline
10/28/2005 5:27 AM  
Hi Saad,

EMControl requires that you assign a critical frequency class property to
significant, or critical, components and nets before you perform EMC rule
checking. Critical components include ICs that are relevant to rules that
examine critical ICs, line drivers, line receivers, fast-switching transistors,
or bi-directional transceivers.

EMControl supplies up to five critical frequency classifications to describe the
EMC characteristics of the ICs and nets in a design.

There are up to five classes for components in a design. You can specify the
corresponding variable value for each component class. You have CLASS1 through
CLASS5 for these settings. For components, the fastest drivers result in a Frequency
Class1 designation and the slowest drivers are designated a Frequency Class5. The
EMC rules you apply to nets and components use this class designation.

You can attach critical frequency classes (EMC_CRITICAL_IC, EMC_CRITICAL_NET,
EMC_CRITICAL_REGION) to design objects automatically using the Manual Property
dialog box from the EMC rule checker.

When you identify the CLASS of the component you can also identify the type of
component by adding the EMC_CVOMP_TYPE property.

For each class of component you can also identify the Voltage swing and the
Rise/Fall time

In the EMC setup you can also define the EMI Regulation that you need to check
against - FCC Class A, FCC Class B, CISPR Class A, CISPR Class B, USERDEF_CLASS,
VCCI Class 1, VCCI Class 2



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Forums > Silicon-package-board > Signal Integrity and Modeling > EMC classes(1-5) in emc_checker


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