Lpc2000

On Thu, Jun 17, 2004 at 09:50:33PM -0400, James Dabbs wrote:
> On low pin count devices, should you ever revisit the concept of a
> "secondary JTAG port," reserve a pin that selects the JTAG port at
> reset.  Alternatively, make the port with the ETM module the secondary
> port, since this is the one that's more difficult to fit into most
> designs.  Enabling (what usually amounts to) the main JTAG interface in
> software is too fragile for such a debug mechanism.

Why does it need to be a JTAG port - with no possibility for boundary scans
(on a controller you can use firmware to do the scan) the JTAG port can
replaced by a single pin.

M.