[hpsdr] Project proposal – Artemis or Arty for short.

[Kevin Wheatley]

Hi Jeremy

Interesting addition, are you proposing an integrated, but stand alone 5 port switch here, i.e a loop back cable from the Micrel KS8995 to the ENC424J600, or doing away withe the ENC altogether?
Main issues without reading the datasheet in detail is the PIC software (I have a module that 'talks' to the ENC), plus the real estate along the edge of the board. If we place outside world connections on the short sides of the board, allowing the use of a large number of off the shelf extruded cases, we are limited to 200 mm of connectivity (100mm either side). One side is going to be taken up completely with the terminal I/O sockets, even then I've had to double stack them, so we've only 100mm to play with for, power, RJ11 (programming - I guess this could be moving off the edge), RJ45 ethernet, probably RS232, Mini USB for bootloader, SD Card slot. As you can see things are getting a bit tight. I'll have a good read of the Micrel Datasheet.

73's
Kevin

On 25 Jan 2011, at 06:42, Jeremy McDermond wrote:

> On Jan 24, 2011, at 10:13 PM, Kevin Wheatley wrote:
> 
>> A standalone PCB, probably Euro card size, 100 x 160mm, attached to an Ethernet switch in the shack...
> 
> What might be really interesting here as long as you're connecting it via Ethernet anyhow is to put something like a Micrel KS8995 (http://www.micrel.com/page.do?page=product-info/fastether_sw.jsp) on it.  That's a 5-port Ethernet switch on a chip.  This way you could actually plug a Metis/Hermes into Artemis, and you'd only need one-wire to the lot of them.  You could also support multiple Metis/Hermes installations at the same location with Artemis doing the antenna switching, etc.  The downside to the Micrel chips is that they're 10/100 only, so you couldn't run full speed on Metis/Hermes.  There may be other options that would allow you to do so.
> 
> --
> Jeremy McDermond (NH6Z)
> Xenotropic Systems
> mcdermj at xenotropic.com
> 
> 
> 


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