Lpc2000

I've used the secondary JTAG on the PLC2106 for debugging - I needed the extra port lines
that enabling the primary JTAG also cripples. 

It worked well.

I used the UART to download a simple program to enable it then away I went.  

I agree its use is clumsy - the arrangement is much better on the LPC213x series.

Subject: 

>> IIRC, the secondary JTAG is not intended for debugging. It's OK for 
>> programming the flash, of course.
>  
>

Leon,

Thanks for the response.  I guess I don't understand Phillips' goals.
Why put an entire second JTAG unit on the part when the UART can be used
to program the flash?  I did a project a while back with the LPC2106
where I was able to debug it with the secondary JTAG port.  The JTAG
interface on this new board was lifted directly from the first project's
schematic.

Can anyone from Phillips explain this, what the second port is for, and
why I might be having such intermittent results?

Thanks.