MEMORY MAPPING METHOD FOR SHARED MEMORY AND MULTI-CPU SYSTEM

摘要

PURPOSE:To improve the throughput of data transfer between CPUs by dynamically setting the size of address space usable in an inter-CPU communication area corresponding to the amount of transfer of data. CONSTITUTION:When a write access request is issued from an execution unit 150, an access controller 160 outputs the write access request to shared memory 4. Also, an access address A is inputted to an address conversion mechanism 120 and an address comparison mechanism 130. The comparator 130 compares the boundary value address AO of an address storage mechanism 140 with the address A. When it is AAO, the address A is outputted as a bit-expanded address AC to the shared memory 4 as it is. When it is A=AO, an address AC=A+AS in which an offset value AS is added on the access address A is outputted to the shared memory 4 as an output address.