[hpsdr] OzyII status update

[Jeremy McDermond]

On Sep 28, 2009, at 5:45 PM, Larry Gadallah wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> 2009/9/28 Andrea Montefusco <andrea.montefusco at gmail.com>:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Michael Ardai wrote:
>>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Microchip sells tiny roms with mac addresses - 24AA02E48 is an i2c
>>> device available in a SOT23-5 or SO8
>>> /mike
>>
>> Great suggestion Mike;
>> these chips contain _real_ MAC addresses, assigned to Microchip by  
>> IEEE
>>
>> 00-04-A3   (hex)                Microchip Technology, Inc.
>> 0004A3     (base 16)            Microchip Technology, Inc.
>>                               2355 W. Chandler Blvd.
>>                               Chandler AZ 85224
>>                               UNITED STATES
>>
>> some docs found at:
>>
>> http://techtrain.microchip.com/webseminars/UpdateHits.aspx?Type=P&Semid=200&Redir=http://techtrain.microchip.com/webseminars/documents/MacAddr_050509.pdf
>>
>>
>> *am*
>
> I thought the common practice was to use MAC assignments that indeed
> reflect the vendor of the PHY, not of the whole system. For example, a
> Dell computer might have an Intel MAC address prefix because an Intel
> Ethernet chip is used to implement the Ethernet interface in the Dell
> computer. So, if OzyII were to use a Microchip interface, it would
> make sense for OzyII's to have Microchip MAC address prefixes.


Not on all machines.  For example, a Sun workstation will use the MAC  
address as encoded on its PROM chip for every interface on the  
computer whether the actual chip that's driving the ethernet is a Sun  
HME, a Intel chip, or an AMD Lance Ethernet.  In this same vein, a  
Macintosh will have a MAC based on the machine, not on the vendor of  
the ethernet chip inside.  Even though my Macbook Pro has a Marvell  
Ethernet controller, the MAC address prefix is Apple's, 00-17-F2.  The  
only reason your assertion is true about PCs historically is that for  
PCs the Ethernet isn't assumed to be there, and there was no way to  
identify the computer by serial number by its other chips.


> -- 
> Larry Gadallah, VE6VQ/W7                          lgadallah AT gmail  
> DOT com
> PGP Sig: 917E DDB7 C911 9EC1 0CD9  C06B 06C4 835F 0BB8 7336

--
Jeremy McDermond (NH6Z)
Xenotropic Systems
mcdermj at xenotropic.com




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