摘要:
A dynamic random access memory having a self-refresh mode comprises a memory array partitioned into four groups in which control are respectively performed and a partial activation control circuit. The four groups in the memory array are alternately refreshed two by two in an operation under the self-refresh mode. As a result, each group in the memory array is refreshed at a time interval of two times a conventional refresh interval, so that the power consumption is decreased.
摘要:
A dynamic semiconductor memory device is divided into a plurality of blocks. An operation of the semiconductor memory device is in either of a normal mode and a refresh mode, depending on the level of a refresh signal. In the normal mode, at an off time period, a potential on a bit line pair is equalized and a precharge potential is applied to the bit line pair. At the access time, equalizing of the potential on the bit line pair and supply of the precharge potential are stopped in a selected block and then, a word line driving signal is raised. On the other hand, in the refresh mode, at the off time period, the potential on the bit line pair is held at "H" and "L" levels by a sense amplifier, so that the potential on the bit line pair is not equalized and the precharge potential is not supplied. On this occasion, a precharge potential generating circuit is electrically disconnected from a power supply. At the time of refresh operation, the sense amplifier is rendered inactive in the selected block, so that the potential on the bit line pair is equalized and then, the word line driving signal is raised.
摘要:
A dynamic random access memory device includes a pair of write-in data transferring buses for transferring data to be written, a pair of read-out data transferring buses for transferring data to be read provided additionally and separately from the write-in data transferring bus pair and a plurality of current mirror type sense amplifiers formed of CMOS transistors and each amplifier being provided between a bit line pair and the read-out data transferring bus pair and having input nodes connected to the corresponding bit line pair and the read-out data transferring bus pair forming output nodes thereof. The current mirror type sense amplifiers of CMOS transistors are activated in response to an output of a column decoder at earlier time than the time when conventional flip-flop type sense amplifiers are activated.
摘要:
A novel semiconductor memory device includes an address detection circuit that produces a short-width pulse in response to the detection of an address change. A column decoder-activating signal generator detects the start of the short-width pulse and in response generates a column decoder-activating signal. A second detection circuit detects the conclusion of the short-width pulse and generates a second pulse that triggers a preamplifier-activating signal that activates a preamplifier and latches the data that is present on the input/output line. A reset signal generator produces a reset signal to deactivate the column decoder-activating signal and to delay the preamplifier-activating signal. The preamplifier-activating signal generator and the reset signal generator are reset while the first pulse is output.
摘要:
A dynamic random access memory device having an input/output load connected between a pair of input/output lines and a control circuit used to generate an internal /RAS signal having a reset transition delayed with respect to the same transition of the external /RAS signal. The internal /RAS signal controls at least a word signal applied to a transistor of a selected memory cell and an enable signal applied to an enable transistor, whereby the time the transistor of the memory cell and the enable transistor become non-conductive is delayed with respect to the time at which a transfer transistor connected between each pair of bit lines and the input/output lines becomes non-conductive.
摘要:
A memory cell array is divided into four blocks #1 to #4. The blocks #1 and #3 are operated when a row address signal RA.sub.8 equals "0". The blocks #2 and #4 are operated when the row address signal RA.sub.8 equals "1". A spare row sub-decoder is provided in each of the blocks. Spare row sub-decoders in the blocks #1 and #2 are connected to a spare row main decoder through a single spare decoder selecting line. The spare row sub-decoders in the blocks #2 and #4 are connected to the other spare row main decoder through another spare decoder selecting line. The spare main decoders are responsive to the row address signal RA.sub.8 and row address signals RA.sub.2, RA.sub.2, . . . , RA.sub.7, RA.sub.7 for operating a spare row sub-decoder in a block which is in the operating state.
摘要:
A semiconductor dynamic RAM provided with an I/O load (5) rendered inactive during a writing cycle comprises a monostable multivibrator (16) for receiving a read/write indicating signal W for indicating reading and writing data from and into a memory cell (2) and outputting a signal We having a shorter duration than that of the signal W at down edge of the signal W as a trigger. The output signal We of the monostable multivibrator (16) is supplied as a control signal for rendering the I/O load (5) inactive.
摘要:
A dynamic random access memory comprises a pair of write-in data transferring lines (IL, IL), a pair of read-out data transferring lines (OL, OL) and a current-mirror type sense amplifier comprising (30) CMOS transistors. The current-mirror type amplifier (30) is connected between a plurality of bit line pairs (BL, BL) and the pair of read-out data transferring lines (OL, OL). At the time of data reading, the pair of write-in data transferring lines (IL, IL) is connected to the corresponding bit line pair (BL, BL) in response to a write-in column decoded signal (YW) obtained by ANDing a column decoded signal (CA) with a write-in instruction signal (W).
摘要:
A semiconductor dynamic RAM provided with an I/O load (5) rendered inactive during a writing cycle comprises a monostable multivibrator (16) for receiving a read/write indicating signal W for indicating reading and writing data from and into a memory cell (2) and outputting a signal W having a shorter duration than that of the signal W at a down edge of the signal W as a trigger. The output signal W of the monostable multivibrator (16) is supplied as a control signal for rendering the I/O load (5) inactive.
摘要:
The present invention comprises: a data storage unit for storing series image data obtained by medical image acquisition equipment and object data containing image acquisition conditions for the series image data and the specific information for specifying other series image data related to the series image data; an information management unit for generating a thumbnail image that represents combination information of the presently obtained series image data and the past related series image data by referring to the object data; and a display unit for displaying the thumbnail image.