SPARC: Triggered when an asynchronous trap occurs. This is either an external interrupt trap number == 0x60 or interrupt level n trap number 0x41 - 0x4F, or an asynchronous trap initiated by the user calling trap_cpu in the sparc-interrupt interface. The Core_External_Interrupt can also be used to catch interrupts, the difference is that Core_Asynchronous_Trap is only triggered if interrupts are enabled.