angus at akkea.ca
Fri Oct 21 16:44:24 CEST 2011
I see a number of people have their GTA04 devices already.
I was hoping you could send me a tracking number for my device so I can
check it's progress.
On Fri, January 21, 2011 2:57 am, Dr. H. Nikolaus Schaller wrote:
> Hi all,
> welcome to this new list where we want to give all Early Adopters a forum
> exchange ideas, requests, status, questions etc. with the developing
> Christoph, David, myself and others from the core development team will
> try to
> answer your questions.
> 1. Component Sourcing
> We have ordered the first GTM601W modules and 25 units will arrive
> in approx. 10 days. So UMTS is secured.
> For the OMAP processors it is not difficult to get them. Either DigiKey,
> Mouser, EBV/Avnet have them in stock.
> A minor issue is finding the best price. There are different options:
> * OMAP3503DCBB (w/o DSM and Graphics engine) is the cheapest
> * OMAP3530DCBB (600 MHz variant)
> * OMAP3530DCBB72 (720 MHz variant)
> * DM3730CBB800
> * DM3730CBB1000 (1GHz)
> They are are drop-in replacements and there is only one very small
> difference between OMAP35xx and DM3730 (replace a R with a C).
> The price is not exactly clear. From my research it appears that
> the DM3730 is cheaper than the OMAP3530DCBB72 - i.e. more
> MIPS/. But this has to be verified before we order.
> A major issue is sourcing of the PoP Memory chips. We need quite
> special devices since they must match the OMAP processor.
> Micron is the main supplier and has two different types:
> a) MT29C - combined LPDDR/NAND flash
> b) MT46H - LPDDR only
> If you want to help us with search please check for a VFBGA168
> package (there are many different packages available).
> We have identified these variants (price is from EBV home page for
> 1000 units):
> 128 MB RAM 256 MB Flash ?
> 256 MB RAM 512 MB Flash ?
> 512 MB RAM 512 MB Flash ?
> 128 MB RAM 0 Flash 13 EUR
> 256 MB RAM 0 Flash 23-37 EUR (there are different temperature ranges)
> 512 MB RAM 0 Flash 58 EUR
> 1024 MB RAM 0 Flash 126 EUR
> for comparison what other projects use:
> * GTA04A2 samples 256 MB RAM 256 MB Flash (~30 but no longer available)
> * Beagleboard 256 MB RAM 256 MB Flash
> * BB-XM 512 MB RAM 0 Flash
> * Pandaboard 1GB RAM 0 Flash (I have no idea how they can sell them at
> 179 USD without loosing much money)
> * OpenPandora 256 MB RAM 256 MB Flash
> The problem we have to solve is that we have not yet got a quotation
> for the MC29C chips and nobody has them in stock. And they appear
> to be available only in Asia or the US. I am working with AVNET
> Europe since weeks to get through this. It is like wading through syrup...
> The supply situation for the MT46H is better - but then we won't have
> built in NAND flash which is good for permanently storing X-Loader,
> U-Boot and the U-Boot environment.
> From our experiences 256 MB RAM is good enough (BeagleBoard) but
> 512 MB would be better. 1GB is still too expensive.
> So if you have experience to share or find other compatible solutions
> or suppliers, please let us know.
> All other components are quite easily available through DigiKey or
> other sources, so we order them with low lead time.
> 2. PCB layout
> We are working heavily on updating the PCB layout from the GTA04A2
> samples towards the GTA04A3 version. This means fixing some nasty
> bugs. We did have bugs in the component library which is a situation that
> no integrated Design Rules Check can reveal. But we know from the
> GTA04A2 samlpes what the most critical bugs are and let's hope that
> we don't introduce new ones :)
> Major changes from A2 -> A3 are:
> * replace GTM501 by GTM601 incl. some driver logic (=> better UMTS
> cheaper, 1.8V logic compatibility, better availability since GTM501
> will go out
> of production)
> * replace LDM303DLH (Accelerometer+Compass) by HMC5883L + BMA180
> (LSM303 is not available, BMA180 has best ADC resolution we know of)
> * redesign step-down converters for TPS65950 (we have problems during
> power on and with higher battery levels - the system does a spurious
> self-reset with voltage > 3.5 V and it appears that there is quite a
> power conversion rate)
> * fix some crossed over lines (I2C1, serial I/F for Bluetooth,
> reassignment of
> some GPIOs to better match power-on states)
> * adding two 60 pin B2B connector headers to allow to connect different
> displays and peripherals
> * AC charger power input added to RS232 connector (6 -> 8 pins)
> I think we will need approx. 2 weeks to finalize this. And then,
> of the PCB needs approx. 4 weeks.
> Our SMD production company is currently getting a new and bigger
> pick&place machine so that they have the capacity to produce hundreds
> of GTA04 units.
> 3. Which information expected in the Wiki?
> I have set up a new wiki page:
> which is thought to communicate the best information materials you need.
> To structure this in advance, please add your wishes to the requested
> 4. Draft of the User Manual
> We are also writing a user manual and please find attached an (early,
> incomplete and sometimes wrong) draft.
> So if you have ideas, suggestions, questions, please use this list for
> BR and happy high-power-Freerunning :)
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> Gta04-owner at goldelico.com
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