Bus system having an address/control bus and a data bus, and a data transfer method thereof

Abstract

A bus arbitration system and a data transfer arbitration method, comprising (a) receiving bus requests from two or more master devices and arbitrating access to an address/control bus according to a predetermined arbitration algorithm, (b) receiving an access command packet containing information for data transfer preparation from the master device through the address/control bus in the order determined as a result of the arbitration and transmitting the received access command packet to a corresponding slave device, (c) receiving notification of transfer preparation completion of corresponding data from the slave device, (d) informing the master device of the start of data transfer, and (e) transferring data through the data bus. The slave devices may be high-speed devices such as synchronous DRAM (SDRAM). Bus efficiency is improved, as separate master devices can simultaneously and separately control the address/control bus and the data bus.