[vdr] Re: Increasing SDRAM on DVB cards

[Stefaan Coddé <stefaan.codde@pandora.be>]

Hermann Gausterer wrote:

>> Well, all we want to find out is which AV7110 pin is SCS2, and
whether 
>> it is routed from under the AV7110 outside to some open area of the 
>> board, where it could be accessed.

>scs2 -> chip select 2 ?? 

>> The hard part will probably be
>> unsoldering the AV7110 BGA chip...

>unsoldering a BGA ic is not hard, but soldering it back is IMPOSSIBLE!!
>BGA are per definition solderable only ONE TIME :->( on every pin there
>is exactly the right amount of Sn (or whatever they use
>;-)
>and in the right form, for making a perfect connection
>you have no possibilety to test the BGA for correct soldering
>(ok, without using X-Rays) so even if you try to solder the >av7110
back
>you can be sure, one (or 50 ;-) pins will sty unconnected 
>if the PIN you are looking for is not on an VIA ("durchkontaktierung")
>there is no way for getting this work!!
>
>on my card the two ram-chips are different with a different count of
pins,
>but the IC with the fewer pins has no solderpads for the pins, he could

>have to be the same as the other (hope it is clear what i mean)


Umm.

The GM72V161621 is a 16Mbit Dram
The HY51V18164C is a 16Mbit Dram
So that's 32mbit/4Mbyte of ram. 
What is the relation between the two then?





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