DATA PROCESSING APPARATUS HAVING FIRST AND SECOND PROTOCOL DOMAINS, AND METHOD FOR THE DATA PROCESSING APPARATUS

摘要

A data processing apparatus (2) comprises a first protocol domain A configured to operate under a write progress protocol and a second protocol domain B configured to operate under a snoop progress protocol. A deadlock condition is detected if a write target address for a pending write request issued from the first domain A to the second domain B is the same as a snoop target address or a pending snoop request issued from the second domain B to the first domain A. When the deadlock condition is detected, a bridge (4) between the domains may issue an early response to a selected one of the deadlocked write and snoop requests without waiting for the selected request serviced. The early response indicates to the domain that issued the selected request that the selected request has been serviced, enabling the other request to be serviced by the issuing domain.