Interface bridge between a system bus and a local bus for controlling at least one slave device, such as a ROM memory

摘要

A slave device (9), connected directly to a system bus (2), which system bus requests the execution of a complex communication protocol, is controlled by another device (18), connected to the system bus, which identifies the slave device as the target of a transaction on the system bus, executes the communication protocol and sends to the slave device through an auxiliary interface (19) a first identification signal (DEV_DEC), a second signal (DEV_ACK) for instructing execution of the transaction, and receives from the slave device, through the auxiliary interface, a transaction executed signal DEV_EDT. In this way the interface logic of the slave device is reduced to the minimum since the slave device is not required to execute the communication protocol. <IMAGE>