摘要:
A read only memory includes a memory cell provided at an intersection between a word line and a bit line, and a plurality of reference potential transmission lines each receiving a reference potential determined in accordance with an externally applied potential designating signal. The memory cell includes a transistor element having a gate coupled to a word line, a drain coupled to a bit line and a source which is coupled to one of the reference potential transmission lines or is held in an open state. Stored data in the memory cell is changed by switching the potentials of the reference potential transmission lines. This enables storing of different data bits in one memory cell.
摘要:
A read only memory includes a memory cell provided at an intersection between a word line and a bit line, and a plurality of reference potential transmission lines each receiving a reference potential determined in accordance with an externally applied potential designating signal. The memory cell includes a transistor element having a gate coupled to a word line, a drain coupled to a bit line and a source which is coupled to one of the reference potential transmission lines or is held in an open state. Stored data in the memory cell is changed by switching the potentials of the reference potential transmission lines. This enables storing of different data bits in one memory cell.
摘要:
A semiconductor integrated circuit device includes a memory cell array for storing data to be processed, and an operational unit for effecting a predetermined operation on the data read from the memory cell array. The memory cell array has first and second regions for storing first and second data words of first and second groups. The first data words and second data words each include a plurality of data bits. The first region includes a plurality of bit arrays for storing data bits of the same digit in the first data words, and the second region includes a plurality of bit arrays for storing data bite of the same digit in the second data words. The bit arrays of the first and second groups are arranged alternately in the order of digits of the data words. The bit arrays storing the data bits of the same digit form one subarray. The data bits in one data word are stored in the same positions of the bit arrays. The operational unit includes operational circuits each corresponding to one of the subarrays. Each operational circuit effects the predetermined operation on the data read from the two bit arrays in the corresponding subarray. Each bit array has selectors responsive to external addresses to select one column from each bit array and connect this column to a corresponding operational circuit.
摘要:
Each of memory cells of a semiconductor memory device comprises a transistor connected between a node and a node, a transistor connected between the node and a node, a transistor connected between a node and a node, and a transistor connected between node and a node. Each of the nodes is connected to either of a first potential line and a second supply line in a program unit when it is manufactured, and each of the nodes is connected to either of the first and the second ground lines in a program unit when it is manufactured.A supply potential is supplied to the first supply line, and the supply potential or the ground potential is selectively supplied to the second supply line. The ground potential is supplied to the first ground line, and the ground potential or the supply potential is selectively supplied to the second ground line.
摘要:
An integrated circuit 1 for video signal processing includes a 2-line memory 3, a video signal processing circuit 4 and a coincidence circuit 6. A digital video signal of 8 bits inputted to an input terminal group 2 is applied to the 2-line memory 3 and the coincidence circuit 6. Also, the 2-line delay signal of 8 bits outputted from the 2-line memory 3 is applied to the coincidence circuit 6. The coincidence circuit 6 determines coincidence or non-coincidence of the input digital video signal and the 2-line delay signal received and outputs the result of that determination through a coincidence output terminal. As a result, an operation of the 2-line memory 3 can be tested individually.
摘要:
An integrated circuit 1 for video signal processing comprises a 2-line memory 3, a video signal processing circuit 4 and a coincidence circuit 6. A digital video signal of 8 bits inputted to an input terminal group 2 is applied to the 2-line memory 3 and the coincidence circuit 6. Also, the 2-line delay signal of 8 bits outputted from the 2-line memory 3 is applied to the coincidence circuit 6. The coincidence circuit 6 determines coincidence or non-coincidence of the input digital video signal and the 2-line delay signal received and outputs the result of that determination through a coincidence output terminal. As a result, an operation of the 2-line memory 3 can be tested individually.
摘要:
A serial access memory device is disclosed in which order of access to writing and reading memory cell columns can be controlled. A writing column selecting circuit and a reading column selecting circuit are each comprised of ring pointers with a controllable number of stages. The number of stages of the ring pointers is controlled in response to control signals stored in a serial interface circuit. As a result, two ring pointers each having two stages are formed in the writing column selecting circuit while one ring pointer having four stages is formed in the reading column selecting circuit. After two data signals are written in selected two memory cell columns in parallel, written data signals are read out from serially selected four memory cell columns at a speed twice that in the writing. This serial access memory device is applied to a progressive scan conversion circuit for video signal processing.
摘要:
The dynamic semiconductor memory device comprises a plurality of write block selecting lines and a plurality of read block selecting lines for selecting any one of the memory cell groups, a plurality of write row selecting lines for selecting any memory cells for a word in one of the memory cell groups selected by the write block selecting lines, a purality of first logic gates connected at one input terminals thereof to the write block selecting lines and at the other input terminals thereof to the write row selecting lines, a plurality of divisional write word lines each connecting an output terminal of one of the first logic gates in parallel to the corresponding memory cells for a word, a plurality of read row selecting lines for selecting any memory cells for a word in one of the memory cell groups selected by the read block selecting lines, a plurality of second logic gates connected at one input terminals thereof to the read block selecting lines and at the other input terminals thereof to the read row selecting lines, and a plurality of divisional read word lines each connecting an output terminal of one of the second logic gates in parallel to the corresponding memory cells for a word.
摘要:
First-In First-Out (FIFO) memory device is disclosed. A ring pointer circuit sequentially and repeatedly selects memory cells in a memory cell array. When it is detected that a defective memory cell exists on a memory cell row, selection of that memory cell row is invalidated by the ring pointer circuit by cutting off a laser trimming line. In addition, by selectively cutting off laser trimming lines in a switching circuit and a redundancy ring pointer circuit, a redundancy memory cell row is selectively added in place of the defective memory cell row. Accordingly, stages required for the ring pointer circuit are maintained. In other words, the FIFO memory device having a defective memory cell is saved, resulting in improvement in yield in the manufacture.
摘要:
A memory cell array (61) comprises a plurality of three-transistor type memory cells (10) arranged in a plurality of rows and columns. A plurality of pairs of write bit lines (WB1, WB2) and a plurality of read bit lines (RB) are provided corresponding to each column of the memory cell array (61). The plurality of write word lines (WWL) and the plurality of read word lines (RWL) are provided corresponding to each row of the memory cell array (61). Information is written to memory cells (10) in odd rows through the respective one write bit lines of the pairs of write bit lines (WB1, WB2), and information is written to memory cells (10) in even rows through the respective other write bit lines of the pairs of write bit lines (WB1, WB2). A sense amplifier (30) is connected to each of the pairs of write bit lines (WB1, WB2). At the time of write operation, refresh operation is performed by the sense amplifier (30) with respect to memory cells (10) in non-selected columns.