Interrupt notification block

An interrupt notification block stored in host memory is disclosed that contains an image of the interrupt condition contents that may be stored in a host attention register in a host interface port. The interrupt notification block is written by the host interface port and pre-fixed into the port pointer array of a host at the time the host interface port updates the pointers stored in a port pointer array in host memory. The host may then read the interrupt notification block to determine how to process a response or an interrupt rather than having to read the host attention register in the host interface port across the host bus.