A data processor comprises a memory-management-unit for receiving external-operation-data from a CPU. The memory-management-unit sets a deterministic-quantity value for the external-operation-data based on the external-operation-data. The deterministic-quantity value may be either an active-value or an inactive-value. The data processor has a non-deterministic-processor-block for receiving a memory-signal from the memory-management-unit, and has a control-block configured to (i) send the memory-signal to an NDP-output-terminal if the deterministic-quantity value is the active-value, thereby bypassing a performance-enhancement-block, or (ii) send at least a portion of the memory-signal that is representative of the request for response-data to the performance-enhancement-block if the deterministic-quantity value is the inactive-value.