摘要:
A semiconductor device applies a hold voltage Vhold to an upper electrode of an electrostatic actuator and a ground voltage to a lower electrode. After the semiconductor device sets the voltage of the lower electrode to a test voltage Vtest, it eliminates the hold voltage Vhold from the upper electrode and places the voltage of the upper electrode in a high impedance state. The potential difference between the upper electrode and the lower electrode is set to Vhold−Vtest=Vmon. Thereafter, the voltage of the lower electrode is returned to the ground voltage. Whether the electrostatic actuator is placed in an open state or in a closed state is determined by measuring the capacitance between the electrodes based on the amount of drop of the voltage of the upper electrode due to capacitance coupling at the time.
摘要:
A sense amplifier circuit senses and amplifies a signal read from memory cells arranged at intersections of word-lines and bit-lines. A write circuit reads first data held in a first memory cell of the memory cells, and writes second data corresponding to the first data in a second memory cell different from the first memory cell. A data latch circuit holds data read from the first memory cell. A logic operation circuit performs a logic operation using data read from the second memory cell and data held in the data latch circuit as input values and outputs third data as an operation value. A write-back circuit writes the third data back to the first memory cell.
摘要:
A semiconductor device applies a hold voltage Vhold to an upper electrode of an electrostatic actuator and a ground voltage to a lower electrode. After the semiconductor device sets the voltage of the lower electrode to a test voltage Vtest, it eliminates the hold voltage Vhold from the upper electrode and places the voltage of the upper electrode in a high impedance state. The potential difference between the upper electrode and the lower electrode is set to Vhold−Vtest=Vmon. Thereafter, the voltage of the lower electrode is returned to the ground voltage. Whether the electrostatic actuator is placed in an open state or in a closed state is determined by measuring the capacitance between the electrodes based on the amount of drop of the voltage of the upper electrode due to capacitance coupling at the time. With this operation, the state of the electrostatic actuator can be simply and accurately determined, and when it is determined that charging and the like occur to the electrostatic actuator, it can be promptly returned to a normal operation state.
摘要:
A sense amplifier circuit senses and amplifies a signal read from memory cells arranged at intersections of word-lines and bit-lines. A write circuit reads first data held in a first memory cell of the memory cells, and writes second data corresponding to the first data in a second memory cell different from the first memory cell. A data latch circuit holds data read from the first memory cell. A logic operation circuit performs a logic operation using data read from the second memory cell and data held in the data latch circuit as input values and outputs third data as an operation value. A write-back circuit writes the third data back to the first memory cell.
摘要:
A semiconductor memory device includes a memory cell array including a plurality of memory blocks, a plurality of redundancy sections respectively provided for the plurality of memory blocks and configured to be substituted for defective memory cells, a test circuit that carries out a test on the memory cell array and outputs defective data, first and second memory circuit that temporarily store the defective data, a first write circuit that writes the defective data alternately in the first and second memory circuits, a first read circuit that reads the defective data alternately from the first and second memory circuits, a plurality of third memory circuits respectively provided for the plurality of memory blocks, that store the defective data, and a second write circuit that writes defective data read by the first read circuit in a third memory circuit corresponding to a memory block in which an error occurred.
摘要:
When memory cells enter a data holding mode, a control circuit of a semiconductor memory device reads out a plurality of data from the memory cells to generate and store a check bit for error detection and correction, and performs a refresh operation in a period within an error occurrence allowable range of an error correcting operation performed by an ECC circuit by using the check bit. Before a normal operation mode is restored from the data holding mode, the control circuit performs control such that an error bit of the data is corrected by using the check bit. In an entry/exit period, read and write are performed by a page operation.
摘要:
A plurality of memory macros are laid out in a semiconductor chip. Macro ID generation circuits generate macro IDs for identifying the memory macros, and have different layouts. These macro ID generation circuits are arranged outside the memory macros in the semiconductor chip, so that test control blocks in the memory macros can use the same layouts between all the memory macros to reduce the design load.
摘要:
The practical operation speed of the memory device is increased by multiplexing input and output signals so as to increase the internal operation frequency higher than the external clock frequency. The feature of the memory device of the present invention is that it has the function of making the internal operation frequency higher than the external clock frequency by making the external bit width larger than the internal bit width, writing write data by dividing them successively by time division operation, into those having an internal bit width, and allocating read data to use an entire external bit width. According to the present invention, the practical operation speed of the memory device assembled on the board can be increased over the upper frequency limit of signals transmitted through the wiring on the board, and the high frequency performance of the memory device can be tested at the step of the die sorting test.