摘要:
A NOR type flash memory includes a plurality of word lines, a plurality of bit lines, at least one bit line, a plurality of nonvolatile memory cells, a row decoder, a cell selection circuit and a programming load. Each of the plurality of nonvolatile memory cells includes a gate electrode, drain electrode and source electrode and the gate electrode is connected to a corresponding one of the plurality of word lines, the drain electrode is connected to a corresponding one of the plurality of bit lines and the source electrode is connected to the source line. The row decoder selects one of the plurality of word lines at the time of data programming. The cell selection circuit includes a column decoder and column gates and is constructed to simultaneously select one bit line from each of the plurality of groups among the plurality of bit lines. The programming load increases the number of programming bits with the progress of programming when data of plural bits is programmed into a plurality of memory cells simultaneously selected by the cell selection circuit.
摘要:
A NOR type flash memory includes a plurality of word lines, a plurality of bit lines, at least one bit line, a plurality of nonvolatile memory cells, a row decoder, a cell selection circuit and a programming load. Each of the plurality of nonvolatile memory cells includes a gate electrode, drain electrode and source electrode and the gate electrode is connected to a corresponding one of the plurality of word lines, the drain electrode is connected to a corresponding one of the plurality of bit lines and the source electrode is connected to the source line. The row decoder selects one of the plurality of word lines at the time of data programming. The cell selection circuit includes a column decoder and column gates and is constructed to simultaneously select one bit line from each of the plurality of groups among the plurality of bit lines. The programming load increases the number of programming bits with the progress of programming when data of plural bits is programmed into a plurality of memory cells simultaneously selected by the cell selection circuit.
摘要:
A memory cell array has a plurality of memory cells formed of EEPROM cells arranged in a matrix form. Data in the memory cells is flash-erased, and after this, word lines other than a selected word line are set to a negative potential and erasing verification for detecting an insufficiently erased memory cell is effected. The flash-erasing and erasing verification are repeatedly effected until no insufficiently erased memory cell is detected. When no insufficiently erased memory cell is detected, word lines other than a selected word line are set to a negative potential and an overerased memory cell is detected. When an overerased memory cell is detected, weak program is effected for the cell by applying a voltage lower than the normal writing voltage to the cell.
摘要:
A semiconductor integrated circuit device includes a main cell array, a fuse cell array, main cell word lines arranged at the main cell array, and fuse cell word lines arranged at the fuse cell array. The fuse cell word lines are formed in a same direction as a direction of the main cell word lines.
摘要:
A semiconductor integrated circuit device includes fuse cells arranged at a fuse cell array, a fuse cell data program and erase circuit, a fuse cell data control circuit, and fuse data latch circuits. The fuse cells include erasable and programmable nonvolatile memory cells. The fuse cell data program and erase circuit programs fuse data to the memory cells and erases the fuse data from the memory cells. The fuse cell data control circuit controls read out timing of the fuse data stored in the memory cells based on a signal generated upon detection of power-on. The fuse data latch circuits latch the fuse data read out from the memory cells.
摘要:
A semiconductor integrated circuit device includes a main cell array, a fuse cell array, main cell word lines arranged at the main cell array, and fuse cell word lines arranged at the fuse cell array. The fuse cell word lines are formed in a same direction as a direction of the main cell word lines.
摘要:
A semiconductor integrated circuit device includes an integrated circuit provided in a semiconductor chip and setting information memory. The setting information memory stores operation/function setting information of the integrated circuit and receives a signal generated based on power-on in reading out the operation/function setting information.
摘要:
A semiconductor integrated circuit device includes a nonvolatile memory cell, a source of the cell receiving a ground potential, and a gate of the cell receiving a first control signal; a transistor, a source of the transistor receiving a drain potential of the cell, and a gate of the transistor receiving a second control signal; and a controller. The controller receives a third control signal generated upon detection of power-on and outputs the first and second control signals. A potential of the first control signal changes from the ground potential to a potential different from the ground potential, which is maintained during a first period of time, and a potential of the second control signal changes from the ground potential to a potential different from the ground potential, which is maintained during a second period of time.
摘要:
A semiconductor integrated circuit device has a data storage section for storing mode setting data corresponding to products of a plurality of types, redundancy data, and so on. The redundancy storage section is made up of a nonvolatile transistor for storing the mode setting data corresponding to the products, the redundancy data, etc., a latch circuit for latching data read out from the nonvolatile transistor and generating a mode signal, and a transmission gate for transmitting the data from read out from the nonvolatile transistor to the latch circuit. The semiconductor integrated circuit device also has an internal voltage generator for generating an internal voltage. This internal voltage is used as the power supply voltage of the data storage section.
摘要:
A nonvolatile semiconductor memory system is provided with a nonvolatile memory cell array divided into erase blocks data and refresh blocks, and a flag cell array including a plurality of nonvolatile flag cells each of which corresponds to one of the refresh blocks and stores data representing the refresh status of the corresponding refresh block.