Method for use with a data coherency protocol allowing multiple snoop queries to a single snoop transaction and system therefor

摘要

A method for use with a data coherency protocol has the steps of receiving a bus transaction in a data processor from a bus, receiving a first response from a memory location, .generating a first protocol signal, receiving a second response from the memory location, generating a second protocol signal and outputting either the first or second protocol signal responsive to the coherency protocol. The data processor operates at a clock frequency at least twice as fast as the bus. The data processor can query its memories at least twice and receive at least two responses during a single cycle of the bus clock. Therefore, the data processor can ignore busy responses from the memories that occur before the end of the single bus clock cycle.