Patent ID: 7870362
Filing Date: 2011-01-11
Classification: G11C

Abstract:
1. A semiconductor memory device, comprising: a single row decoding block configured to decode an inputted address to thereby generate a logical unit cell block address and a decoded word line address; a tag block for converting the logical unit cell block address configured to access N unit cell blocks into a physical unit cell block address for accessing N+1 unit cell blocks, wherein N is an integer greater than 0; an address latching block configured to latch the decoded word line address generated from the single row decoding block to thereby output a latched word line address as a word line activation signal without additional decoding in response to the physical unit cell block address; a cell area configured to output a data, which is stored therein, in response to the word line activation signal, the cell area having N+1 unit cell blocks, each including M word lines, M being an integer greater than 0, wherein the N unit cell blocks are corresponded to the logical unit cell block address and one unit cell block accesses data with high speed; a predetermined cell block table configured to assign M word lines among the (N+1)×M word lines as predetermined restorable word lines; and a control unit configured to control the tag block, the single row decoding block and the predetermined cell block table to activate one word line of the unit cell block selected by the physical unit cell block address and a corresponding one of the predetermined restorable word lines, wherein each unit address latch block in the address latching block corresponds to each latched word line, wherein the address latching block includes latch blocks having a predetermined word line latch configured to receive the decoded word line address to thereby output as an internal control signal in response to a word line selection signal and to generate the word line activation signal in response to the internal control signal and the physical cell block address outputted from the tag block, and wherein the predetermined word line latch includes: a second NMOS transistor having a gate, a drain and a source, wherein the gate receives a cell block activation signal and the drain/source is coupled to the decoded word line address; first and second PMOS transistors, each having a gate, a drain and a source, wherein the source is coupled to a supply voltage VPP, the gate of the first PMOS transistor is coupled to the drain of the second PMOS transistor and the gate of the second PMOS transistor is coupled to the drain of the first PMOS transistor; a third NMOS transistor having a gate, a drain and a source, wherein the gate receives the internal control signal INT and the drain coupled to the drain of the first PMOS transistor; a fourth NMOS transistor having a gate, a drain and a source, wherein the gate receives a predetermined word line activating signal and the source is coupled to a ground; a fifth NMOS transistor having a gate, a drain and a source, wherein the gate receives a reset signal and the source is coupled to the ground VSS; third to fourth inverters circularly connected to each other for outputting an inverse signal of the decoded word line address as the word line activation signal and keeping a logic state of the word line activation signal.