As of release 13, Mathworks has not included the necessary files
to add interrupt capability to their xPC Target Scramnet drivers.
Until they do, you will have to add the files to Matlab as follows:

Place files
	
	getioirqhookstruct.m
	mxpcinterrupt.m

into folder

	matlabroot\toolbox\rtw\targets\xpc\target\build\xpcblocks


Place file

	xpcscramnethooks.c

into folder

	matlabroot\toolbox\rtw\targets\xpc\target\build\src