Thread: Neo900 - finally a successor of N900
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joerg_rw is offline joerg_rw
2013-09-18 , 22:39
Posts: 2,222 | Thanked: 12,651 times | Joined on Mar 2010 @ SOL 3
#499
Originally Posted by dion_starfire View Post
The DM37xx series supports addressing up to 4GB, and if I'm reading the datasheet correctly requires a Mobile DDR (aka LPDDR1) chip with a 90-ball FBGA and a 16- or 32-bit width, and it can handle up to two of them. Going by that, why wouldn't either of these 2GB modules work with it?

http://www.samsung.com/global/busine...=7860&iaId=749
http://www.samsung.com/global/busine...=7861&iaId=749

As much as I like the idea of 512MB + 1GB Fast Swap, I like the idea of 2-4GB of real RAM even more.
Umm, which packaging are you referring to? You're aware that we use a DM3730CBP100 515POP-FCBGA (CBP) and need a matching PackageOnPackage MultiChipPackage piggyback chip on top of the SoC, that contains the up to 1GB RAM (2 banks a 512MB via 2 CipSelect) and the NAND flash in one rather special packaging? Or did I miss something?
We even checked for availability of RAM-only POP that would give us 1GB without the NAND (we *could* make device boot from eMMC then instead of NAND), but no luck for that either.
We tried to find the chip that Nokia is using on top of the OMAP in N9, but that chip "doesn't exist" - means it's built to order for Nokia and not available for mere mortals.
/j

http://processors.wiki.ti.com/index....election_Guide
AM/DM37x - PoP and Discrete
CBP package - 168 ball 12x12 PoP memories
DRAM - PoP only. SDRC signals occur only on top balls
http://talk.maemo.org/showpost.php?p...&postcount=331
So, if i'm not wrong, this means that with the DM3730, to reach 1GB of ram we must use 2 x ram chips of 512MBytes selecting the first or the second bank with the CS (chip select) pin.
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Last edited by joerg_rw; 2013-09-18 at 23:46.
 

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