Re: Xué review
andres.calderon at emqbit.com
Tue Aug 10 23:03:46 EDT 2010
2010/8/10 Andrés Calderón <andres.calderon at emqbit.com>:
> 2010/8/10 Andrés Calderón <andres.calderon at emqbit.com>:
>> On Tue, Aug 10, 2010 at 11:44 AM, Eric Brombaugh <ebrombaugh1 at cox.net> wrote:
>>> I've been taking a look at the Xué schematics and sent a few questions to Wolfgang which he asked me to share with the list. I read through the previous threads before composing this list so hopefully these are up-to-date.
>> The schematics are not finished yet, but we hope to meet the schedule
>> (although we do not work on the project full time):
>>> 1) How much of this has been prototyped already? Since you're planning to use a Spartan6 FPGA it seems it would be a great idea to test as much of this as possible prior to designing a board. In particular I see that the DRAM, USB and Ethernet interfaces appear to use IP from Lattice or Opencores.org and should be fairly quick to bring up on an existing development board. Spending a bit of cash today to prototype the system level components and prove them out could save a lot of board spins and hair pulling down the road.
>> We plan to reuse as much as possible of the MilkyMist One design as
>> posible, so several of the Xue has already been tested.
>>> 2) What is the plan for power-up configuration of the FPGA? As it stands the schematic is unclear about this - is a SPI or parallel flash planned? I assume there be provisions for the soft host processor to update it.
>> I have not decided, but I tend to use SPI.
>>> 3) What's the power supply going to look like? Is it POE? What is the estimated power requirement for the final design in Spartan 6? What type of regulators are planned (switchers or LDOs)? Will you use pre-built modules or a custom design on-board?
The maximum S6 power requirements according to IT:
The MM1 PSU components:
3.3V | Max Iout=1.0A | LP38690 | LDO | National
2.5V | Max Iout=3.0A | PTH04000 | Switching | TI (Switching
Regulator with Auto-Track Sequencing)
1.2V | Max Iout=0.8A | LP38511 | LDO | National
Cel: +57 (300) 275 3666
Email: andres.calderon at emqbit.com
Gtalk: andresfcalderon at gmail.com
>> For this version we do not plan to use PoE. I like the Linear LTC3411
>> Step-Down DC/DC Converter. But perhaps we should expect to find a
>> cheap Chinese version.
> I like the PSU Ben, we can use the same components (if the S6 power
> requirements are met). A list of EUTECH Step-down DC/DC Converter in
>  http://downloads.qi-hardware.com/hardware/qi_avt2/v1.0/orcad_sch/qi_avt2_v1.0.pdf
>  http://www.eutechmicro.com/PL_9_11_EN.html
> Andrés Calderón
> Cel: +57 (300) 275 3666
> Email: andres.calderon at emqbit.com
> Gtalk: andresfcalderon at gmail.com
> Web: www.emqbit.com
>>> 4) Any plans for GPIO in addition to the CIS interface? Seems that an ethernet-connected camera like this would be ideal in remote locations and providing interfaces for controlling other devices would be ideal - I'm particularly thinking about things like pan/tilt heads, zoom/aperture/focus controls on lenses, temperature sensors, etc.
>> Yes, so many GPIOs as possible.
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>> Andrés Calderón
>> Cel: +57 (300) 275 3666
>> Email: andres.calderon at emqbit.com
>> Gtalk: andresfcalderon at gmail.com
>> Web: www.emqbit.com
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