Multiprocessor system bus protocol with group addresses, responses, and priorities

摘要

A multiprocessor system bus protocol system and method for processing and handling a processor request within a multiprocessor system having a number of bus accessible memory devices that are snooping on. at least one bus line. Snoop response groups which are groups of different types of snoop responses from the bus accessible memory devices are provided. Different transfer types are provided within each of the snoop response groups. A bus master device that provides a bus master signal is designated. The bus master device receives the processor request. One of the snoop response groups and one of the transfer types are appropriately designated based on the processor request. The bus master signal is formulated from a snoop response group, a transfer type, a valid request signal, and a cache line address. The bus master signal is sent to all of the bus accessible memory devices on the cache bus line and to a combined response logic system. All of the bus accessible memory devices on the cache bus line send snoop responses in response to the bus master signal based on the designated snoop response group. The snoop responses are sent to the combined response logic system. A combined response by the combined response logic system is determined based on the appropriate combined response encoding logic determined by the designated and latched snoop response group. The combined response is sent to all of the bus accessible memory devices on the cache bus line.