Snoop request management in a data processing system

摘要

Snoop requests are managed in a data processing system having a cache coupled to a processor that provides access addresses to the cache. Snoop queue circuitry provides snoop addresses to the cache via an arbiter. The snoop queue circuitry has a snoop request queue for storing a plurality of entries. Each entry of the snoop request queue that corresponds to a snoop request includes a snoop address and a corresponding status indicator. The corresponding status indicator indicates whether the snoop request has zero or more collapsed snoop requests having a common snoop address which have been merged to form the snoop request. The status indicator is used for debug and by fullness management logic to manage the capacity of the snoop request queue. A general collapsed status signal is generated to indicate whenever any snoop queue entry collapsing occurs.