Patent ID: 7656220
Filing Date: 2010-02-02
Classification: G11C,H01L

Abstract:
1. A semiconductor device comprising: a set of address nodes supplied with an access address to select at least one memory cell; a first storage circuit including a plurality of first fuses to store first address information; a first enable circuit including a second fuse that is programmed independently of the first address information, the first enable circuit producing a first control signal that takes one of active and inactive levels in accordance with a programmed state of the second fuse; a first hit detection unit detecting whether the access address matches the first address information, the first hit detection unit coupled to the set of address nodes, the first storage circuit and the first enable circuit to receive the access address, the first address information and the first control signal, the first hit detection unit being enabled by the active level of the first control signal to produce a match signal when the access address takes the first address information; a second storage circuit including a plurality of third fuses to store second address information; a second enable circuit including a fourth fuse that is programmed independently of the second address information, the second enable circuit producing a second control signal that takes one of active and inactive levels in accordance with a programmed state of the fourth fuse; and a second hit detection unit coupled to the set of address nodes, the second storage circuit and the second enable circuit to receive the access address which is the same as the access address to be detected by the first hit detection unit, the second address information and the second control signal, the second hit detection unit being enabled by the active level of the second control signal to produce a match signal when the access address which is the same as the access address to be detected by the first hit detection unit takes third address information that is different from and based on the second address information and is different from the first address information.