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plug.gulp
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Joined: Sat Jul 28, 2012 1:59 am

[Newbie] How to identify the SoC...

Sat Jul 28, 2012 2:10 am

Hi,

I am new to Raspberry Pi group. I received RPi yesterday. I am looking at the board and the diagram below (which is taken from http://www.element14.com/community/serv ... 282%29.jpg). I am trying to identify the SoC on the board I received. From the below diagram, it seems the SoC should be the big rectangular black square(the chip) at the centre of the board. And that is Broadcom's SoC BCM2835. Now, I am not a hardware person so my understanding is quite limited in this case, but I was expecting some labeling on the chip which indicated that it was BCM2835. Instead the board I received has the label Samsung K4P2G324ED. I did a web search and found that the K4P2G324ED is a Mobile DRAM (http://www.samsung.com/global/business/ ... uctId=7611). So how do I tell just by looking at the board that the SoC is Broadcom BCM2835? Sorry, if this sounds stupid but I am new to Raspberry Pi.

Thanks and regards,

~Plug

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Joe Schmoe
Posts: 4277
Joined: Sun Jan 15, 2012 1:11 pm

Re: [Newbie] How to identify the SoC...

Sat Jul 28, 2012 2:40 am

The SOC is underneath the memory chip.

I think that means that it cannot be seen.
And some folks need to stop being fanboys and see the forest behind the trees.

(One of the best lines I've seen on this board lately)

W. H. Heydt
Posts: 11014
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: [Newbie] How to identify the SoC...

Sat Jul 28, 2012 6:34 am

If you look at the edges of the big square, you can see that there are two layers. The top layer is the DRAM chip package. The bottom layer (closer to the PCB) is the processor chip package.

As you read the forums, you will find references to "PoP", which is "Package on Package". The bottom package is the processor and the top package is the memory. It does make for real short data paths....

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AndrewS
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Location: Cambridge, UK
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Re: [Newbie] How to identify the SoC...

Sat Jul 28, 2012 11:04 am

Bit more info on the wiki http://elinux.org/RPi_Hardware

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plug.gulp
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Joined: Sat Jul 28, 2012 1:59 am

Re: [Newbie] How to identify the SoC...

Sun Jul 29, 2012 3:27 am

Thaankoo everyone for the reply! :D

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