摘要:
A memory card is used on a card write and/or read apparatus which has a data bus with an arbitrary bit width and writes and/or reads a datum to and/or from the memory card. The memory card comprises a data input/output terminal (5, 21, 62a, 62b), a memory part (1, 12, 13, M0-M7) having a data bus with a bit width of at least n bits for coupling to the data bus of the card write and/or read apparatus via the data input/output terminal, an address input terminal (2, 16, 70) for receiving an address signal, a first input terminal (7, 19, 66) for receiving a first chip select signal which selects a first byte, a second input terminal (8, 20, 65) for receiving a second chip select signal which selects a second byte, and a decoder circuit (9, 15, 61) for determining a bit width of the data bus of the memory part to be used for data communication between the card write and/or read apparatus to one of n bits and n/N bits based on the first and second chip select signals and one or a plurality of arbitrary bits of the address signal by supplying control signals to the memory part, where n, N and n/N are positive integers.
摘要:
A semiconductor memory device comprises a first memory (16, 70, 201-208, 321, 420, 501) comprising memory cells for prestoring fixed data, a decoder (14, 15, 71, 72, 209-216, 225-228, 302, 305, 505, 506) for decoding an input address and for reading out a fixed data from the first memory based on a decoded input address, a second memory (23, 82, 235, 322, 331, 411, 502, 503) for storing a data identical to that prestored in a defective memory cell of the first memory, where the second memory comprising programmable non-volatile memory cells, a discriminating part (13, 75, 76, 96, 308, 309, 426, 522, 523, 531) including a third memory (63, 64, 73, 74, 93, 94, 95, 307, 423, 504) for storing a redundant address of each defective memory cell of the first memory for discriminating whether or not the input address coincides with the redundant address and for outputting a discrimination signal when the input address coincides with the redundant address, and a selecting part (25, 80, 305, 309, 426, 506) supplied with data read out from the first and second memories for normally outputting the data read out from the first memory and selectively outputting the data from the second memory when the discrimination signal is received from the discriminating part.
摘要:
A memory card is used on a card write and/or read apparatus which has a data bus with an arbitrary bit width and writes and/or reads a datum to and/or from the memory card. The memory card comprises a data input/output terminal (5, 21, 62a, 62b), a memory part (1, 12, 13, M0-M7) having a data bus with a bit width of at least n bits for coupling to the data bus of the card write and/or read apparatus via the data input/output terminal, an address input terminal (2, 16, 70) for receiving an address signal, a first input terminal (7, 19, 66) for receiving a first chip select signal which selects a first byte, a second input terminal (8, 20, 65) for receiving a second chip select signal which selects a second byte, and a decoder circuit (9, 15, 61) for determining a bit width of the data bus of the memory part to be used for data communication between the card write and/or read apparatus to one of n bits and n/N bits based on the first and second chip select signals and one or a plurality of arbitrary bits of the address signal by supplying control signals to the memory part, where n, N and n/N are positive integers.
摘要:
A dual-port type semiconductor memory device having a serial data input and output circuit (200) provided outside of a memory cell array (1) and operable for high-speed serial data input and output of data in addition to random data access. The semiconductor memory device includes a single decoding circuit (5) triggering at least one gate for transferring data to be stored into or read from the memory cell array in a random data access mode and setting a single bit to a corresponding shift register (24) in the serial data input and output circuit in a serial data input and output operation mode. Preferably, the decoding circuit is operated only during a time for operatively connecting bit lines and latch circuits in the serial data input and output circuit in the serial data input and output operation mode. The serial data input and output circuit is operable independently from the memory cell array, except during the time for operatively connecting the bit lines and the latch circuits through transfer gates, for serially inputting data to or outputting data from the latch circuits through serial data bus by sequentially triggering the serial gates from a certain gate designated by the corresponding shift register in response to the decoding circuit.
摘要:
A semiconductor memory device comprises a first memory (16, 70, 201-208, 321, 420, 501) comprising memory cells for prestoring fixed data, a decoder (14, 15, 71, 72, 209-216, 225-228, 302, 305, 505, 506) for decoding an input address and for reading out a fixed data from the first memory based on a decoded input address, a second memory (23, 82, 235, 322, 331, 411, 502, 503) for storing a data identical to that prestored in a defective memory cell of the first memory, where the second memory comprising programmable non-volatile memory cells, a discriminating part (13, 75, 76, 96, 308, 309, 426, 522, 523, 531) including a third memory (63, 64, 73, 74, 93, 94, 95, 307, 423, 504) for storing a redundant address of each defective memory cell of the first memory for discriminating whether or not the input address coincides with the redundant address and for outputting a discrimination signal when the input address coincides with the redundant address, and a selecting part (25, 80, 305, 309, 426, 506) supplied with data read out from the first and second memories for normally outputting the data read out from the first memory and selectively outputting the data from the second memory when the discrimination signal is received from the discriminating part.
摘要:
A dual-port type semiconductor memory device having a serial data input and output circuit (200) provided outside of a memory cell array (1) and operable for high-speed serial data input and output of data in addition to random data access. The semiconductor memory device includes a single decoding circuit (5) triggering at least one gate for transferring data to be stored into or read from the memory cell array in a random data access mode and setting a single bit to a corresponding shift register (24) in the serial data input and output circuit in a serial data input and output operation mode. Preferably, the decoding circuit is operated only during a time for operatively connecting bit lines and latch circuits in the serial data input and output circuit in the serial data input and output operation mode. The serial data input and output circuit is operable independently from the memory cell array, except during the time for operatively connecting the bit lines and the latch circuits through transfer gates, for serially inputting data to or outputting data from the latch circuits through serial data bus by sequentially triggering the serial gates from a certain gate designated by the corresponding shift register in response to the decoding circuit.