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XINT13 in F28M35x Concerto

In the Technical Reference Manual for F28M35x devices (spruh22c) XINT13 is listed in the PIE Vector Table on page 116, and is shown in the CPU-Timer Interrupts diagram on page 141.

I am unable to find any information about this external interrupt anywhere.  Is there a chunk of documentation missing, or are these typos?  Are there any control registers for it?  If not, what pin is this input assigned to?