Lpc2000

Is it possible to cascade more than one LPC controller in a JTAG chain?
I tried this with my protoboard but no success,only the first 
controller in the chain can be programmed.
I am using Keil uVision3 and Ulink for debugging

Any help would be appreciated .

M. Farahat

No, I don't think this is possible. When the JTAG
looks at the first port it is "tied" to the TAP, maybe
if your debugger supports multiple TAPS?

Samuel

--- me_farahat <me_farahat@...> wrote:

> Is it possible to cascade more than one LPC
> controller in a JTAG chain?
> I tried this with my protoboard but no success,only
> the first 
> controller in the chain can be programmed.
> I am using Keil uVision3 and Ulink for debugging
> 
> Any help would be appreciated .
> 
> M. Farahat
> 
> 
> 
> 
> 
> 



	
		
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On Tuesday 20 September 2005 10:20, me_farahat wrote:
> Is it possible to cascade more than one LPC controller in a JTAG chain?

You most certainly can do this in general, but....

> I tried this with my protoboard but no success,only the first
> controller in the chain can be programmed.
> I am using Keil uVision3 and Ulink for debugging

... the JTAG debugger must be aware of the extra items in the chain and must 
know how to bypass them.

While you are programming one device, the others must be set in BYPASS. Not 
all debuggers allow you to do this. Ask the Ulink tech support people. They 
might have an answer.