What if I don’t have a spare I/O port?

You can connect RTBx to an address bus that runs at up to 250 MHz. To do this, you must reserve a range of addresses for ipoints, with one bit reserved to indicate that the value on the address bus is an ipoint. The ipoint instrumentation writes a value to a specific address in that region to denote a specific ipoint. This approach reduces the maximum trace duration of the RTBx.