Content originally posted in LPCWare by CodeRedSupport on Tue Oct 05 03:53:44 MST 2010
[B]LPC-Link[/B] does not support serial wire trace functionality of the Cortex-M3 processor within the LPC1343 thus SWO (also known as SWV) is not required for "normal debugging".
However if you ever intend to use your board with the Red Trace functionality of the full Red Suite with a RedProbe+ (rather than just using LPCXpresso IDE with LPC-Link), or equivalents from other companies, then be aware that this trace functionality would require SWO/SWV.