Address translation unit performing address translation from virtual address to physical address

摘要

Provided is a TLB that can translate rapidly a virtual address to a physical address at small power consumption. A tag entry part ( 808 ) includes an ASID hold part ( 810 ), virtual address hold part ( 811 ), valid bit part ( 812 ), ASID comparison judgment part ( 102 ), and a virtual address comparison judgment part ( 104 ). By an ASID match line ( 105 ), a plurality of CAM cells ( 813 ) of the ASID hold part ( 810 ) are connected in parallel to each other and also connected to the ASID comparison judgment part ( 102 ). By a virtual address match line ( 106 ), a plurality of CAM cells ( 813 ) of the virtual address hold part ( 811 ) are connected in parallel to each other and also connected to the virtual address comparison judgment part ( 104 ). An ASID effective signal ( 107 ) is provided from the ASID comparison judgment part ( 102 ) to the virtual address comparison judgment part ( 104 ).