摘要:
A phase change memory device has a semiconductor substrate; a plurality of cell arrays stacked above the semiconductor substrate, each cell array having memory cells arranged in a matrix manner for storing resistance values as data that are determined by phase change of the memory cells, bit lines each commonly connecting one ends of plural memory cells arranged along a first direction of the matrix and word lines each commonly connecting the other ends of plural memory cells arranged along a second direction of the matrix; a read/write circuit formed on the semiconductor substrate as underlying the cell arrays for reading and writing data of the cell arrays; first and second vertical wirings disposed outside of first and second boundaries that define a cell layout region of the cell arrays in the first direction to connect the bit lines of the respective cell arrays to the read/write circuit; and third vertical wirings disposed outside of one of third and fourth boundaries that define the cell layout region in the second direction to connect the word lines of the respective cell arrays to the read/write circuit.
摘要:
A semiconductor memory device includes a bit line, a memory cell coupled to the bit line and a word line coupled to the memory cell. A first time between receiving a write command for a write operation in order to write data to the memory cell and the beginning of the write operation is different from a second time between receiving a refresh command for a refresh operation in order to refresh data stored in the memory cell and beginning the write operation.
摘要:
A system includes a sensor section which receives fuzzy information inputs X containing a plurality of components and converts the plurality of components into a plurality of measurable input physical quantities, a converter which receives a plurality of input physical quantities and converts the input physical quantities into a plurality of pulses having pulse widths corresponding to the magnitudes thereof, and a feature extraction section (NF) which receives a plurality of pulses, selects the plurality of pulses by using a set pulse width as a reference, and extracts feature information items y0, y1, y2, . . . which express the features of the fuzzy information inputs X from the fuzzy information inputs X according to the number of selected pulses.
摘要翻译:一种系统包括传感器部分,其接收包含多个分量的模糊信息输入X并将多个分量转换成多个可测量的输入物理量;转换器,其接收多个输入物理量并将输入的物理量转换为 具有与其大小对应的脉冲宽度的多个脉冲和接收多个脉冲的特征提取部(NF),通过使用设定脉冲宽度作为基准选择多个脉冲,并且提取特征信息项y 0, y 1,y 2,... 。 。 其根据所选脉冲的数量从模糊信息输入X表达模糊信息输入X的特征。
摘要:
A non-volatile semiconductor memory device includes: a memory cell array in which a plurality of electrically rewritable and non-volatile memory cells are arranged; a sense amplifier circuit configured to write M-value data (where, M is an integer equal to 4 or more) to pair-cells each constituted by simultaneously selected first and second memory cells connected to a pair of bit lines in the memory cell array, the M-value data being defined as a combination of different threshold levels of the first and second memory cells in M threshold levels to be set at each memory cell, and read M-value data stored in each pair-cell by sensing a difference between cell currents of the first and second memory cells; and a controller configured to control data write and read operations for the memory cell array.
摘要:
A semiconductor device comprises a memory cell array, a counting circuit, a control circuit, a specification circuit, a selection circuit and a data I/O circuit. The selection circuit effects switching between a normal mode and a synchronous mode in a mode setting cycle. In the normal mode, setting of addresses is performed irrespective of a clock signal. In the synchronous mode, an edge of the clock signal determines the timing of operation.
摘要:
A semiconductor device includes a memory cell array, a control section and latency setting circuit. The control section configured to receive a clock signal and a first control signal, and configured to output a plurality of the data in synchronism with the clock signal after the first control signal is asserted, output of the data beginning a number of clock cycles (latency N) of the clock signal (latency N being a positive integer ≧2) after the first control signal is asserted, a different one of the data being output at each of the clock cycles after the output begins until the plurality of data is output. The latency setting circuit sets the latency N. The latency setting circuit includes at least one switch which permanently fixes a latency.
摘要:
Each delay unit is divided into two delay unit groups, the preceding stage side and the succeeding stage side. To the delay unit group in the preceding stage side, power supply voltage is supplied via a power supply terminal, and to each delay unit of the delay unit group in the succeeding stage side, power supply voltage is supplied from the power supply terminal via a power supply control switch. A forward-pulse detecting circuit detects that forward pulse was propagated to a stage between the N-th stage and a stage a predetermined number of stages before the N-th, and outputs the detected result to the power supply control switch. With this operation, when forward pulse is propagated to the (N+1)th stage, power supply voltage is supplied also to the delay unit group in the succeeding stage side. As electric power is not supplied to the delay unit group in the succeeding stage side when forward pulse is not propagated to the (N+1)th stage, wasteful consumption of electric power is prevented.
摘要:
A state-holding circuit initializing circuit initializes state-holding circuit when propagation of forward pulse to the forward-pulse delay circuits in the last stage is detected. With this operation, synchronization is established in a short time from the resumption of outputting from a receiver. The state-holding circuit control circuit also controls the reset timing of the state-holding circuit. A forward-pulse adjusting circuit controls the pulse width of forward pulse to be supplied to the forward-pulse delay line. With this operation, the stages from the stage where rearward pulse was generated to the first stage are securely turned to the set state, enabling propagation of rearward pulse and synchronization is established. Thus, synchronization is established reliably even when output from a receiver stops or the duty of an external clock signal is heavy.
摘要:
An image memory has a random access memory array capable of being randomly accessed; a serial access memory array partitioned into n power of 2 (n>1) divisional areas cyclically and serially accessed in asynchronism with the random access memory; data transfer unit for transferring data between the random access memory array and the serial access memory array; a determined unit for determining a row of data to be transferred from the random access memory array to each of the divisional areas; and a designating unit for designating at least one of a top serial access address and a last serial access address respectively of each divisional area, wherein the data transfer unit executes data transfer from the random access memory array to the serial access memory array in accordance with outputs from the determining unit and the designating unit.
摘要:
In a semiconductor memory system, an SDRAM comprises a memory cell array 101 which is divided into a plurality of cell array blocks, a column decoder, a row decoder, and a sense amplifier circuit. In the SDRAM, a first operation mode with a first cycle time is set when successive access within a cell array block is conducted, a second operation mode with a second cycle time shorter than the first cycle time is set when successive access covering the cell array blocks being apart from each other is conducted and a third operation mode with a medium cycle time is set when successive access covering the cell array blocks adjacent to each other is conducted. With the above constitution, a high speed access can be realized without provision of a specific accessory circuit while suppressing overhead for a semiconductor chip size.