Permitting access of slave device from master device based on process ID's

摘要

A computer system has a master device having a first register for storing a first process ID associated with a software process number. The master device transmits the first process ID onto a system bus when it generates a transaction. The computer system has a slave device holding a second process ID for permitting access. The slave device accepts the transaction when the first process ID and the second process ID meet a predetermined condition.