cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Highlighted
Visitor
Visitor
4,602 Views
Registered: ‎09-06-2011

Spartan 6 - 6SLX45FGG484

Jump to solution

Hey there,

i'am struggling with the pdn design for the spartan 6.

For a proper Design i need to know the exit frequency where

the Board can rise above the target impedance and the

chip takes over. Have you any idea?

 

Kind regards,

Tobias Buckel

Tags (1)
0 Kudos
1 Solution

Accepted Solutions
Highlighted
Instructor
Instructor
5,666 Views
Registered: ‎07-21-2009

Tobias,

 

I took a few minutes to look through the linked page and an indirectly linked apnote.  I didn't see any compelling and intrinsic elegance in these docs which would simplify the task of circuitboard design.

 

If you don't mind a somewhat simpler (and arguably less pretentious) approach, I refer you to UG393 -- and specifically to Chapter 2.  The recommendations are quite solid and simple to understand and follow.  And there is a healthy and useful dosage of fundamental principles to provide insight for informed design.

 

The Altera and Xilinx board design guidelines are more alike than they are different, but you are still unlikely to find that all terms used in one set of docs directly correspond to terms used in the other set of docs.  I wouldn't let this bother you.

 

-- Bob Elkind

SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:
1. Read the manual or user guide. Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
3. Do not post the same question on multiple forums.
4. Do not post a new topic or question on someone else's thread, start a new thread!
5. Students: Copying code is not the same as learning to design.
6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
7. You are not charged extra fees for comments in your code.
8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.

View solution in original post

4 Replies
Highlighted
Instructor
Instructor
4,456 Views
Registered: ‎07-21-2009

I've been a design engineer for over 30 years, and I have no idea what you are talking about.

 

-- Bob Elkind

SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:
1. Read the manual or user guide. Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
3. Do not post the same question on multiple forums.
4. Do not post a new topic or question on someone else's thread, start a new thread!
5. Students: Copying code is not the same as learning to design.
6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
7. You are not charged extra fees for comments in your code.
8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.
0 Kudos
Highlighted
Visitor
Visitor
4,441 Views
Registered: ‎09-06-2011

Hi Bob, thanks for the reply.

The Power Distribution Network (PDN) of a PCB has to be dimensioned

so that the noise on the supply rail (e.g. VCCINT) due to the switching current

of the FPGA doesn´t exceed the specified range in the Datasheet.

Altera does a great job there and supports this topic with several papers.

http://www.altera.com/technology/signal/power-distribution-network/sgl-pdn.html

 

So once again, can anybody tell me the necessary exit frequencys for the

Core Supply and the Bank Supplys.

 

Sorry for the useless topic title :-(

 

kind regards,

Tobias Buckel

0 Kudos
Highlighted
Instructor
Instructor
5,667 Views
Registered: ‎07-21-2009

Tobias,

 

I took a few minutes to look through the linked page and an indirectly linked apnote.  I didn't see any compelling and intrinsic elegance in these docs which would simplify the task of circuitboard design.

 

If you don't mind a somewhat simpler (and arguably less pretentious) approach, I refer you to UG393 -- and specifically to Chapter 2.  The recommendations are quite solid and simple to understand and follow.  And there is a healthy and useful dosage of fundamental principles to provide insight for informed design.

 

The Altera and Xilinx board design guidelines are more alike than they are different, but you are still unlikely to find that all terms used in one set of docs directly correspond to terms used in the other set of docs.  I wouldn't let this bother you.

 

-- Bob Elkind

SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:
1. Read the manual or user guide. Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
3. Do not post the same question on multiple forums.
4. Do not post a new topic or question on someone else's thread, start a new thread!
5. Students: Copying code is not the same as learning to design.
6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
7. You are not charged extra fees for comments in your code.
8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.

View solution in original post

Highlighted
Visitor
Visitor
4,424 Views
Registered: ‎09-06-2011

Thanks Bob, thats not what i expected but i will swallow that pill.

0 Kudos