[hpsdr] Hermes

[Rob Frohne]

Hi Phil,

That is more pins than I thought (without looking).  I'm still in favor 
of the Ethernet, but I was trying to make sure that there wasn't an easy 
solution that would make everyone happy.

73,

Rob

On 08/10/2010 06:57 PM, Phil Harman wrote:
> Hi Rob,
>
> I will look at that since it would solve the problem of FPGA pins. One
> other advantage of the Ethernet solution is that a 125MHz clock is all we
> need for the entire board.  We would need an additional 24MHz clock for
> the USB.
>
> Jumper selecting some 20+ pins could also be a problem particularly since
> the PHY data is at 250MHz.
>
> I've also had a chance to use the Ethernet connection to HPSDR for a few
> days.  It is so much nicer than USB. No driver issues, at Gig-E I can
> unplug all the cables (with the PC and OyzII still connected) and plug
> then back in and it all starts automatically.
>
> 73's Phil...
>
>
>
>    
>> Hi Phil,
>>
>> Have you considered possibly having both circuits on the board, so that
>> one or the other could be selected with a set of physical jumpers to
>> connect the pins to the USB part or the ethernet part of the circuit?
>>
>> 73,
>>
>> Rob
>>
>> On 08/05/2010 08:20 PM, Phil Harman wrote:
>>      
>>> Hi Rob,
>>>
>>> I don't think we will have enough FPGA pins to have both options.
>>>
>>> 73's Phil...
>>>
>>>
>>>
>>>        
>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>
>>>> Hi Phil,
>>>>
>>>> I vote for ethernet as well, but I'm wondering how much it would add to
>>>> the complexity and cost to leave the USB interface on there as well.
>>>>
>>>> 73,
>>>>
>>>> Rob, KL7NA
>>>>
>>>> On 08/04/2010 07:18 PM, David McQuate wrote:
>>>>
>>>>          
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>
>>>>> I vote for Ethernet.  (I believe I heard you had a way of loading the
>>>>> FPGA over Ethernet. True?)
>>>>> 73,
>>>>> Dave
>>>>>
>>>>> Phil Harman wrote:
>>>>>
>>>>>            
>>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>>
>>>>>> All,
>>>>>>
>>>>>> Having completed the Beta testing of Hermes we are now preparing to
>>>>>> make
>>>>>> the necessary changes to bring the board into a production ready
>>>>>> state.
>>>>>>
>>>>>> There are quite a few changes which are mainly due to the fact we
>>>>>> want to
>>>>>> ensure the product lives up to the 'High Performance' name tag.
>>>>>>
>>>>>> One of the changes is to replace one of the high current linear
>>>>>> regulators
>>>>>> with a SMPSU. We are fortunate to have Kjell, LA2NI,  on our design
>>>>>> team.
>>>>>> Kjell has designed a high frequency SMPSU that works well when
>>>>>> incorporated on the Hermes PCB and does not introduce significant
>>>>>> spurs. This substantially reduces the current drain and also the heat
>>>>>> dissipation.
>>>>>>
>>>>>> The other potential change is this.  I have this week build a
>>>>>> prototype
>>>>>> OzyII Gigabit Ethernet board. It works very well and I'm impressed
>>>>>> with
>>>>>> how rugged Ethernet appears to be in comparison to USB and Firewire.
>>>>>>
>>>>>> We therefore have the opportunity to replace the USB interface on
>>>>>> Hermes
>>>>>> with Ethernet.  There are a number of advantages in doing this:
>>>>>>
>>>>>> - we overcome the USB driver issues when using different operating
>>>>>> systems
>>>>>> - we can 'network attach' Hermes
>>>>>> - we will have a very high speed interface to the board for future
>>>>>> features
>>>>>> - we can use a much longer Ethernet cable than USB allows
>>>>>>
>>>>>> the disadvantages
>>>>>>
>>>>>> - it may need more that one spin of the PCB which will delay the
>>>>>> delivery
>>>>>> - we will use approximately 10% of the FPGA to implement the Ethernet
>>>>>> interface.
>>>>>>
>>>>>> I'm not too concerned about using more of the FPGA since the device
>>>>>> we are
>>>>>> using is 70% larger than that used on Mercury.
>>>>>>
>>>>>> So "to USB or not to USB - that is the question"?
>>>>>>
>>>>>> 73's Phil...VK6APH
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>>>              
>>>>> _______________________________________________
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>>>>>            
>>>> --
>>>> Rob Frohne, Ph.D., P.E.
>>>> E.F. Cross School of Engineering
>>>> Walla Walla University
>>>> 100 SW 4th Street
>>>> College Place, WA 99324
>>>> (509) 527-2075			 http://people.wallawalla.edu/~rob.frohne
>>>>
>>>> _______________________________________________
>>>> HPSDR Discussion List
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>>>>
>>>>          
>>>
>>>        
>> --
>> Rob Frohne, Ph.D., P.E.
>> E.F. Cross School of Engineering
>> Walla Walla University
>> 100 SW 4th Street
>> College Place, WA 99324
>> (509) 527-2075			 http://people.wallawalla.edu/~rob.frohne
>>
>>
>>      
>
>    

-- 
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla University
100 SW 4th Street
College Place, WA 99324
(509) 527-2075			 http://people.wallawalla.edu/~rob.frohne

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