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Subject: custom measurement
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nikhilbny
Posts: 4
Online: User is Offline
3/17/2007 9:48 AM  
i need help regarding custom measurement sigxp for

setup
hold
rise time
fall time

i want to know the parameter which we can set in custom section of sigxp

thanks in advance

nikhil
kenk57
Posts: 3
Online: User is Offline
3/30/2007 9:16 AM  
I don't quite understand what you mean by "the parameter which we can set in custom section of sigxp".

However, if you wish to have SigXp calculate the setup time, for instance, you will need to create the measurement expression that will do this for you. The setup measurement will be based upon

1) the time your "strobe" crosses a reference point for the first time in any given cycle; your Data Strobe time.
2) the time your data crossed the reciever in the previous cycle; your Prev Data Time.
3) subtract Prev Data Time from Data Strobe.

You will need three custom measurements to complete this task. One named Data_Strobe, one named Prev_Data_Time, and one named Setup. (Note: there is a multiplier in the equations (1e+009) to convert the results to nano-seconds instead of the default seconds the tool uses). (Also the reference voltage for the equations is 1.25 Volts. You will need to correct this to the value you wish to use).

Your Data_Strobe custom measurement will be:

product
CrossingTime
Strobe
PkgPin
1.25
RiseOrFall
First
1e+009

Your Prev_Data_Time custom measurement will be

product
RangeCrossingTime
Reciever
PkgPin
0
quotient
Data_Strobe
1e+009
1.25
RiseOrFall
LAST
1e+009

And finally, your Setup custom measurement will be

difference
Data_Strobe
Prev_Data_Time

The other measurements you ask about can be created in a similar manner.
Donald Telian
Posts: 42
Online: User is Offline
4/05/2007 10:39 AM  
Try downloading the PCI Express Design Kit for some good/interesting examples of custom measurements. YOu can export those measurements and re-use them in your design too.

Donald
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
nikhilbny
Posts: 4
Online: User is Offline
4/14/2007 11:33 PM  

Thanks

i am looking for the same what u explain

thanks once again

Nikhil
nikhilbny
Posts: 4
Online: User is Offline
4/15/2007 12:28 AM  
Hi kenk57

is there any application notes or tutorial available
let me know

nikhil
xiliu
Posts: 1
Online: User is Offline
5/30/2007 7:47 PM  
Hi Donald, IE always shows HTTP Error 403 when trying to download PCI Express Design Kit, could you tell me other way to download that Kit? Thanks, Xi
Donald Telian
Posts: 42
Online: User is Offline
5/30/2007 8:26 PM  
Xi,

There was a problem with the download a couple weeks ago, but I heard it was fixed. I'll send a note to the people in charge of the links. They may contact you, and check back in a day or two.

Donald
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
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