I/O tab

I/O— Allows you to change the name and type of the block I/O.
Name— Allows you to specify the name of the block I/O.
Type— Allows you to select the I/O direction of the block I/O: input, output, or bidirectional.
Existing block— Displays the current name and type of the inputs and outputs in the selected block. You can select an input or output from the list, or specify new assignments under I/O in the Name or Type lists.