This dialog is displayed when you select the HW
Break if X, then if Y…
option from the Breakpoints
Hardware submenu of the Code
window Debug menu.

This breakpoint uses two breakpoint units, and you see two separate breakpoints recorded in the Break/Tracepoints pane, with dependencies on one another.
Enter Address Expression to Match
Select the type of hardware breakpoint that you want to set from the drop-down list:
HW Read triggered when the application reads from the specified address
HW Write triggered when the application writes to the specified address
HW Access triggered when the application accesses the specified address for any reason
HW Instr triggered when the specified instruction is reached
Enter the address expression.
Enter 'Then' address expression to Match:
Select the type of hardware breakpoint that you want to set from the drop-down list, as above.
Enter the address expression.
The breakpoint is triggered only when the first event is followed by the second event.