[DSP-10] Processor stuck....???

[Bob Larkin]

Hi Hermann,

I would suspect the grounding on the EZKIT.  It is not set up for convenient
grounding! Short wires from the power ground to the metal  box should do it,
but added insurance is to run short wires from two ground pins on P3 to the
metal box(pins 1 and 50 are what I used, but 18 and 24 are also listed as
ground).

I have never seen a problem such as you describe!! IAL is part of the DMA
that is not used. I have placed fingers on 2181 to see the temperature and
it doesn't seem to make any difference.

Hope it goes away.

73, Bob  W7PUA

At 12:04 PM 3/21/02 EST, you wrote:
>Hi All....maybe sombody has the same problem... (maybe it isnt a actual 
>problem?)
>
>EZ Kit in the Box, well shielded...but as soon as I put my fingers at the 
>processors-top (insulated..not touching any pin !) the time-ticks go off  and 
>after I take my fingers away it takes some time and normal oparation is 
>resumed. Sometimes it screws up the whole program and I have to reset and 
>reload both programs.
>
>Friend Walter found out that this has to do with PIN 20 on P3:2, which leads 
>to PIN 125 (the last PIN on the "Zero" corner) on the ADSP 2181 and it is an 
>input Signal called  I A L .  So far I can see, this signal is not used in 
>our application. If this PIN gets grounded by a 100 K resistor, everything is 
>fine.
>
>Could this cause problems and who got the same experience ???
>
>Answers wellcome,,,,, de DC9UP Hermann
>
>