[Arm-netbook] EOMA/CF idea

[Vladimir Pantelic]

Gordan Bobic wrote:
>   On Tue, 03 Jan 2012 17:45:15 +0100, Vladimir Pantelic
>   <vladoman at gmail.com>  wrote:
>>  lkcl luke wrote:
>>>  On Tue, Jan 3, 2012 at 3:13 PM, Vladimir
>>>  Pantelic<vladoman at gmail.com>   wrote:
>>>>   lkcl luke wrote:
>>>>
>>>>>      hardkernel got away with 42x25mm for goodness sake, and that
>>>>>  was
>>>>>   mostly single-sided!  B2B connectors on the other side.
>>>>>
>>>>>  http://www.hardkernel.com/renewal_2011/products/prdt_info.php?g_code=G129705564426
>>>>>
>>>>>      but, they had to do a 10 (possibly 12-layer) board to get
>>>>>  everything
>>>>>   into that space.
>>>>
>>>>   and POP, so no SDRAM routing....
>>>
>>>    good point! hmmm.... maybe there's an advantage to POP after
>>>  all...
>>
>>  in saving board space, there is. But I don't think there is non-LPDDR
>>  POP
>>  anyway...
>
>   I don't really see a problem with POP, given that the RAM is soldered
>   on anyway. If you can max out the capability of the SoC in terms of RAM
>   it can handle, and you can do it using a POP arrangement, then it's a
>   great idea. Sure, the ICs might be a bit more expensive, but it removes
>   a lot of scope for mistakes in terms of trace lengths and timing issues,
>   so it is probably worth it - not to mention that it makes things much
>   more compact.
>
>   The only case where it's an issue is where it isn't possible to get a
>   big enough RAM chip. But if your SoC can only handle a gig and you can
>   get a gig POP chip, go for it. :)

I don't see a problem with POP either, except for the fact that I know
only LPDDR POP and not ordinary DDR3 POP.... And you surely don't want
LPDDR due to the extremely high price...