摘要:
In a block access memory in which the memory cell array is divided into a plurality of blocks and data input/output is carried out by block unit, each block is divided into a plurality of subblocks, and the timing of activating the word line and the timing of activating the sense amplifier are made different for each subblock in the block in which the selected word line is included, whereby the peak current associated with the bit line charge/discharge at the time of activating the sense amplifiers is reduced.
摘要:
An address decoding circuit for a functional block comprises branch portions serially connected with each other, in which a selecting signal is outputted on one of two output portions in accordance with the first bit information of an address signal when a selecting signal is applied to the first stage branch portion. The second stage output portion, to which the selecting signal is applied, outputs a selecting signal on one of two output portions in response to the second bit information of the address signal, in accordance with the selecting signal. Thereafter, each branch portion of the third to last stages outputs a selecting signal on one of two output portions in response to respective contents of the third bit to last bit of the address signal in accordance with the selecting signal applied from the preceding stage. By this selecting signal, a memory cell as a functional block portion is selected and is activated.
摘要:
A semiconductor memory device of folded bit line structure provided with a cross portion in at least one portion of each of bit line pairs so that values of coupling capacitance with adjacent bit line pairs are equal to each other with respect to the paired bit lines.Preferably, the respective bit line pairs are equally divided into 4N and the cross parts are provided at dividing points so that bit line pairs having the cross parts at the same dividing points are arranged on alternate pairs of bit lines.Preferably, the cross parts are provided in regions for forming restore circuits or sense amplifiers.More preferably, a dummy word line for selecting dummy cells for providing reference potential is selected by the position of a selected word line.
摘要:
A semiconductor memory device of folded bit line structure provided with a cross portion in at least one portion of each of bit line pairs so that values of coupling capacitance with adjacent bit line pairs are equal to each other with respect to the paired bit lines. Preferably, the respective bit line pairs are equally divided into 4N and the cross parts are provided at dividing points so that bit line pairs having the cross parts at the same dividing points are arranged on alternate pairs of bit lines. Preferably, the cross parts are provided in regions for forming restore circuits or sense amplifiers. More preferably, a dummy word line for selecting dummy cells for providing reference potential is selected by the position of a selected word line.
摘要:
A semiconductor memory device comprises a plurality of memory cell array blocks. An address changing system is provided in each memory cell array block. The same address signal is applied to these address changing systems. Each address changing system comprises a plurality of linking devices. By previously blowing out any of the linking devices in each address changing system, an externally applied address signal is changed with another address signal to be applied to a corresponding memory cell array block.
摘要:
In a block access memory, the memory cell array is divided into a plurality of blocks, one word line is selected based on the external address and the access to the memory cells connected thereto is carried out in one block and, simultaneously, one word line is selected based on the internally generated refresh address and the refresh of the memory cells connected to the word line is carried out in the other block.
摘要:
An address decoding circuit for a functional block comprises branch portions serially connected with each other, in which a selecting signal is outputted on one of two output portions in accordance with the first bit information of an address signal when a selecting signal is applied to the first stage branch portion. The second stage output portion, to which the selecting signal is applied, outputs a selecting signal on one of two output portions in response to the second bit information of the address signal, in accordance with the selecting signal. Thereafter, each branch portion of the third to last stages outputs a selecting signal on one of two output portions in response to respective contents of the third bit to last bit of the address signal in accordance with the selecting signal applied from the preceding stage. By this selecting signal, a memory cell as a functional block portion is selected and is activated.
摘要:
A word length variable circuit of a semiconductor memory comprises a shift register provided corresponding to rows or columns of a memory cell array. The input of the first stage of the shift register is connected to the output of the last stage and regions of the shift register is grouped to form a fixed recirculation path. The word length can be varied by modifying stored data in the shift register without changing its recirculation path.
摘要:
A semiconductor memory device of folded bit line structure includes a cross portion in at least one portion of each bit line pair so that values of coupling capacitance with adjacent bit line pairs are equal to each other with respect to the paired bit lines. Preferably, the respective bit line pairs are equally divided into 4N (N being an integer), although advantages of the invention may be obtained with division of the bit lines into 3N, and the cross parts are provided at dividing points so that bit line pairs having the cross parts at the same dividing points are arranged on alternate pairs of bit lines. In a preferred embodiment, the cross parts are provided in regions for forming restore circuits or sense amplifiers. In a further embodiment, a dummy word line for selecting dummy cells for providing a reference potential is selected according to the position of a selected word line.
摘要:
A semiconductor memory includes a memory cell array having a plurality of bit lines and a plurality of word lines arranged intersecting with the bit lines. A plurality of memory cells are arranged at intersections of the bit lines and the word lines, respectively. Word line selecting circuitry selects one of the word lines responsive to a row address and reads out to each of the bit lines information stored in the memory cell associated with the selected word line. A plurality of sense amplifiers are associated with corresponding rows of the memory for detecting and amplifying the information stored in respective memory cells. A first column selector circuit selects the sense amplifiers corresponding to a column address when the column address is applied and reads information held in the sense amplifier. Blocks are formed by dividing the memory cell array into groups of bit lines, each of the groups comprising a predetermined number of bit lines with block information transferred simultaneously from corresponding ones of the groups of bit lines of a selected block when the column address corresponding to the selected block is applied. Data registers hold information of an associated block. A second column selector reads data corresponding to the column address from the data register when the column address is applied.