摘要:
A semiconductor memory device includes a memory cell array, row decoder, bit line pairs, sense amplifier, sense amplifier control circuit, data latch, transfer gate, transfer gate control circuit, and write circuit. The memory cell array has dynamic memory cells arranged in an array form. The row decoder decodes a row address signal to select a desired one of rows of the memory cell array. Each of the bit line pairs is connected to those of the memory cells which are arranged on a corresponding one of columns of the memory cell array. The sense amplifier amplifies data read out on the paired bit lines and positively feeding data back to the paired bit lines to hold the data. The sense amplifier control circuit controls the operation of the sense amplifier. The data latch latches readout data and write data. The transfer gate transfers data between the data latch and the sense amplifier. The transfer gate control circuit controls the transfer gate. The write circuit writes data into the data latch in synchronism with a clock signal. At the time of writing data into the memory cells, data is previously supplied to the data latch by the write circuit and latched in the data latch, and after the transfer gate control circuit controls the transfer gate to supply data to the bit line pairs from the data latch, the sense amplifier control circuit activates the sense amplifier.
摘要:
A semiconductor memory device comprises a plurality of memory cells including at least a first memory cell and a second memory cell, a first bit line connected to the first memory cell, a second bit line connected to the second memory cell and paired with the first bit line, an equalizer connected between the first and second bit lines, an amplifier connected between the first and second bit lines, a first driving signal line connected to the amplifier and drives the amplifier, a second driving signal line connected to the amplifier and paired with the first driving signal line, a driver for driving the amplifier and connected to the first and second driving signal lines and containing a precharger for presetting the potentials of the first and second driving signal lines to a predetermined precharge potential and a driving signal supply circuit for supplying a driving signal to the first and second driving signal lines, and a control circuit for controlling the equalizer and the driver, wherein the control circuit controls the equalizer and the precharger independently so that the precharger continues supplying the precharge potential to the first and second driving signal lines until essentially immediately before the driving signal supply circuit supplies the driving signal to the first and second driving signal lines.
摘要:
A semiconductor memory device includes a memory cell array, row decoder, bit line pairs, sense amplifier, sense amplifier control circuit, data latch, transfer gate, transfer gate control circuit, and write circuit. The memory cell array has dynamic memory cells arranged in an array form. The row decoder decodes a row address signal to select a desired one of rows of the memory cell array. Each of the bit line pairs is connected to those of the memory cells which are arranged on a corresponding one of columns of the memory cell array. The sense amplifier amplifies data read out on the paired bit lines and positively feeding data back to the paired bit lines to hold the data. The sense amplifier control circuit controls the operation of the sense amplifier. The data latch latches readout data and write data. The transfer gate transfers data between the data latch and the sense amplifier. The transfer gate control circuit controls the transfer gate. The write circuit writes data into the data latch in synchronism with a clock signal. At the time of writing data into the memory cells, data is previously supplied to the data latch by the write circuit and latched in the data latch, and after the transfer gate control circuit controls the transfer gate to supply data to the bit line pairs from the data latch, the sense amplifier control circuit activates the sense amplifier.
摘要:
Even-numbered columns are arranged in the first memory cell array (bank), and odd-numbered columns are arranged in the second memory cell array (bank). A column address signal is input to an adder through a buffer. When data is read out of two or more columns, the adder generates a column address signal whose address value is more than that of the column address signal by one. The adder supplies a first column decoder with a column address signal for addressing an even-numbered column and supplies a second column decoder with a column address signal for addressing an odd-numbered column. Since the even-numbered columns and odd-numbered columns are arranged in their separate memory cell arrays, data read out of continuous two or more columns do not collide with each other.
摘要:
On a semiconductor substrate, there are formed a first macro cell having wiring layers of three layers each formed of a metal wiring layer (for example, an aluminum wiring) and a second macro cell having wiring layers of three layers each formed of a metal wiring layer similar to the first macro cell. The first macro cell is formed to have a wiring structure of three wiring layers though the originally necessary number of metal wiring layers is two. The metal wiring layer of each layer on the first macro cell is formed of the same material as the metal wiring layer of the corresponding each layer on the second macro cell. Moreover, the metal wiring layer of each layer is formed to have the same film thickness. In order to connect the first and second macro cells to each other, a macro interconnection wiring is formed to be included in the third wiring layer (uppermost wiring layer).
摘要:
On a semiconductor substrate, there are formed a first macro cell having wiring layers of three layers each formed of a metal wiring layer (for example, an aluminum wiring) and a second macro cell having wiring layers of three layers each formed of a metal wiring layer similar to the first macro cell. The first macro cell is formed to have a wiring structure of three wiring layers though the originally necessary number of metal wiring layers is two. The metal wiring layer of each layer on the first macro cell is formed of the same material as the metal wiring layer of the corresponding each layer on the second macro cell. Moreover, the metal wiring layer of each layer is formed to have the same film thickness. In order to connect the first and second macro cells to each other, a macro interconnection wiring is formed to be included in the third wiring layer (uppermost wiring layer).
摘要:
A semiconductor device of a memory-macro type can be designed within a short time to have a desired storage capacity, which does not occupy a large area, so as to reduce the chip cost. The semiconductor device includes a memory macro having sub-memory macros, each sub-memory macro having a DRAM memory-cell array, and a row decoder and a column decoder for selecting any desired memory-cell from the memory cell of the array. The memory macro also includes a control-section macro having a DC potential generating circuit for generating various DC potentials required to drive the sub-memory macros. At least one of the sub-memory macros is combined with the control-section macro to form the memory macro as a one-chip memory capable of storing an integral multiple of N bits.
摘要:
According to the present invention, a data bus common to a plurality of memory cell arrays is formed by selecting a column so as to prevent a data collision from occurring. Specifically, two memory cell arrays have each of data buses in common. A column decoder is supplied with a control signal to control a column selection logic circuit. The column selection logic circuit is so controlled that the data read out to the data buses in response to the control signal is prevented from colliding with each other during the simultaneous access to the two cell arrays.
摘要:
A semiconductor memory device includes a memory cell array having a plurality of memory cells arranged in rows and columns, a plurality of pairs of bit lines to each of which the plurality of memory cells arranged in the column direction are connected, a plurality of latch type amplifiers each of which is provided between the bit lines of a corresponding one of the bit line pairs to amplify a potential difference between the bit lines, a plurality of activation circuits for respectively activating the plurality of latch type amplifiers, a data bus acting as passages of input data, a plurality of latch type storage circuits each of which is provided on a corresponding one of the columns and connected to the data bus, for temporarily storing the input data, a plurality of transfer gates for transferring the input data from the latch type storage circuits to the latch type amplifiers, and a transfer control circuit for controlling the transfer gates to simultaneously transfer the input data from the latch type storage circuits to the latch type amplifiers for each of the rows, wherein the memory cell array is divided into a plurality of sub-arrays including a preset number of columns and the activation circuits are provided for the respective sub-arrays.
摘要:
A semiconductor memory device includes a memory cell array having a plurality of memory cells arranged in rows and columns, a plurality of pairs of bit lines to each of which the plurality of memory cells arranged in the column direction are connected, a plurality of latch type amplifiers each of which is provided between the bit lines of a corresponding one of the bit line pairs to amplify a potential difference between the bit lines, a plurality of activation circuits for respectively activating the plurality of latch type amplifiers, a data bus acting as passages of input data, a plurality of latch type storage circuits each of which is provided on a corresponding one of the columns and connected to the data bus, for temporarily storing the input data, a plurality of transfer gates for transferring the input data from the latch type storage circuits to the latch type amplifiers, and a transfer control circuit for controlling the transfer gates to simultaneously transfer the input data from the latch type storage circuits to the latch type amplifiers for each of the rows, wherein the memory cell array is divided into a plurality of sub-arrays including a preset number of columns and the activation circuits are provided for the respective sub-arrays.