Lpc2000

10K pull down resistor on the RTCK pin is good enough to enable the 
debug port.
If the RTCK pin is connected to your JTAG box make sure
that when the sRST is asserted, the RTCK pin pulldown resistor
is good enough to fight the drive applied by the JTAG box on the RTCK 
pin. RTCK pin is an input to the JTAG box but this is something to 
watch out for.

A simple way to determine if your pulldown is effective (to enable 
the jtag port) or not is to hold the chip in reset with the JTAG box 
connected and measuring the voltage level on the RTCK pin. It should 
be in the range of 0.7-0.8 V.

--- In lpc2000@yahoogroups.com, kiaa@n... wrote:
> 
> 
> 
> 
> Hello group!
> 
> I am working on a design with LPC2114 and I want to use the MULTI
> development environment for
> the device.
> I have connected the JTAG signals and the RTCK to a 20-pins 
connector,
> ref. the ARM 20-pins connector refered to by Green Hills.
> 
> There are a few questions I want to put before the group:
> - Is correct to force the RTCK signal low via 4.7 ohm resistor to 
enable
> the debug port?
> 
> - The DBGSEL signal is described in the LPC2114/2124/2212/2214 
manual, but
> I can not find it on the LPC2114.
> - Can I use the debug/Jtag signal for other purposes when the debug 
bus is
> disabled?
> 
> - Does anybody have any experience with the LPC2000 and MULTI 
environment?
> 
> Best regards
> Kirsti