Re: 320pin BGA Pin Layout suggestions
- From: krw <krw@xxxxxxxxxx>
- Date: Mon, 19 Mar 2007 10:13:36 -0400
In article <45fe4b5a$0$5744$afc38c87@xxxxxxxxxxxxxxxxxxxx>,
joe.g@xxxxxxxxxxxxxxx says...
Hi All,
I am looing at laying out 320pin BGA on a PCB like this one.
http://www.standardics.nxp.com/packaging/package.outlines/pdf/sot824-1.pdf
The pitch between balls is 0.5mm. The internal cpu speed is 220MHz but the
external I think is ~60MHz.
It has a JTAG port
Questions
Q1
How many PCB layers would you recommend and why
Not enough information. The BGA looks fairly simple (only four
rings) but I'd need to know what the power balls look like and how
many supplies. If it's only a single supply and the inner balls are
only power (often the case) you can get by with four layers (2S2P).
I'd add another plane if I/Os are on the inner ring and one for other
supplies.
Q2
Is there anything else I should watch out for?
As David indicated, decoupling caps.that square in the middle of the
BGA is a perfect place for them.
Any other pointers on this beast would be appreciated.
--
Keith
.
- References:
- 320pin BGA Pin Layout suggestions
- From: Joe G \(Home\)
- 320pin BGA Pin Layout suggestions
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