AVR-Chat

JTAG
I could swear I posted this here already, and if I did, I apologise.


I'm putting 3 AT90CAN128 devices on a board.

I have room for 3 tiny MLF parts, but not 3 JTAG connectors.

Does anyone know if it is possible to daisy-chain the JTAGs and use
normal programmers, debuggers etc?

David

--- In AVR-Chat@yahoogroups.com, "David Collier" 
<from_yahooAVRchat@...> wrote:

> Does anyone know if it is possible
> to daisy-chain the JTAGs ...

Well, there is a way in AVR Studio to specify that a JTAG ICE interface 
is in a chain and give its position, so it would seem to be Atmel's 
intent that this work as you require.  Maybe someone with actual 
experience will reply.

Graham.

Me too! <'net joke>

I know Xilinx shows that you can daisy-chain the
outputs to the next device's inputs, but I have no
idea whether that is applicable to AVR devices.

Sounds like something interesting to breadboard.

Jeff Engel
--- Graham Davies <Yahoo37849@ecrostech.com> wrote:

> --- In AVR-Chat@yahoogroups.com, "David Collier" 
> <from_yahooAVRchat@...> wrote:
> 
> > Does anyone know if it is possible
> > to daisy-chain the JTAGs ...
> 
> Well, there is a way in AVR Studio to specify that a
> JTAG ICE interface 
> is in a chain and give its position, so it would
> seem to be Atmel's 
> intent that this work as you require.  Maybe someone
> with actual 
> experience will reply.
> 
> Graham.
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 


Happiness is - positive intake manifold pressure.

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