Patent ID: 8234453

Claim:
A processor comprising: a first large scale integration (LSI) containing a processor that performs computing processing; a plurality of second large scale integrations (LSIs) each having a cache memory which stores data and address information; and information transmission paths connecting the first LSI to the plurality of the second LSIs, wherein the first LSI contains an address information issuing unit which broadcasts, to the plurality of the second LSIs, via the information transmission paths, address information of data to which access is requested by the processor, wherein each second LSI of the plurality of the second LSIs includes: a partial address information storing unit which stores a part of address information of an entire cache memory storage area; a partial data storing unit which stores data that is associated with the address information stored in the partial address information storing unit; a selection unit that selects address information to be stored in the partial address information storing unit in the second LSI from the broadcasted address information; and a comparison unit which compares the selected address information with the address information stored in the partial address information storing unit to judge which one of a cache hit and a cache miss occurs, wherein the first LSI and the plurality of the second LSIs are stacked, wherein the selection units of the plurality of the second LSIs are placed directly under the address information issuing unit of the first LSI, wherein each of the selection units is connected to the information transmission paths, wherein the plurality of the second LSIs are stacked on a bottom surface of the first LSI, wherein the information transmission paths comprise through electrodes formed in the plurality of the second LSIs, and wherein the plurality of the second LSIs constitutes a set associative cache memory with an N associativity, and functions, when the number of the plurality of the second LSIs is M, as a cache memory whose maximum associativity is N×M.