摘要:
This semiconductor circuit includes a plurality of memory cell arrays arranged mutually adjacent in one direction, a plurality of first selection/sense amplifier circuits provided in the respective regions between mutually adjacent pairs of these memory cell arrays and make access to one of alternately defined odd-numbered or even-numbered memory cell trains in the order of arrangement, two units of second selection/sense amplifier circuits arranged on the outside of the memory cell arrays on both ends of the arrangement of the plurality of memory cell arrays and make access to one of the designated odd-numbered or even-numbered memory cell trains of the memory cell arrays on both ends, a plurality of data buses corresponding to the respective bits of data transferred in bit parallel between an external circuit, and a plurality of input and output switching circuits arranged and connected in one-to-one correspondence to the respective first and second selection/sense amplifier circuits connected to the plurality of data buses so as to have an equal number of memory cell trains capable of transferring data with these data buses, and a plurality of input and output switching circuits which transfer data with the first and the second selection/sense amplifier circuits in one-to-one correspondence.
摘要:
A multibit semiconductor memory device for inputting and outputting data in a parallel fashion in a unit of bits. The multibit memory has a memory cell array composed of mixed memory cells corresponding to different IO bits, data I/O terminals corresponding respectively to IO bits, an address terminal for inputting an address and internal data buses associated respectively with the IO bits and connected to the memory cell array. Further, the memory device has a test mode entry signal generator for generating a test mode entry signal indicative of entry into a test mode, a pseudo-address generator connected to the address terminal, for generating a pseudo-address in the test mode, and a connecting circuit responsive to the test mode entry signal for selecting one of the internal data buses depending on the pseudo-address and connecting the selected bus to predetermined one of the data I/O terminals.
摘要:
The semiconductor memory device according to the present invention includes a memory cell array consisting of a plurality memory cells provided in array form and a plurality of bit lines and word lines connected respectively to the plurality of memory cells, I/O lines consisting of a first wiring and a second wiring connected to a predetermined number of bit lines out of the plurality of the bit lines via a selection circuit, and a clamping circuit which is activated at the time of read and includes a first device which connects the first wiring and the second wiring when the potential of the first wiring exceeds the potential of the second wiring by more than a predetermined voltage value, and a second device which connects the first wiring and the second wiring when the potential of the second wiring exceeds the potential of the first wiring by more than the predetermined voltage. Thus, even when a potential drop is generated in the I/O lines during the transition period, a marked drop in the potential of one of the wirings can be prevented by the clamping operation between the two wirings that constitute the I/O lines. Accordingly, it is possible to prevent the destruction of data in the memory cells, and to enhance the reading speed of the next data because of the small value of the potential drop of the wiring.
摘要:
Disclosed is an invention concerning a quantization bit number allocating section for sub-band coding, wherein data important for human auditory sense are efficiently coded within a limited coding bit capacity to provide a high-quality digital audio signal. The quantization bit number allocating section comprises a level calculating section, a logarithm calculating section, an index calculating section, a quantization bit number calculating section, a logarithm weighting table, and a sub-band weighting table, wherein the quantization bit number is determined every prescribed time according to human auditory sense and the characteristic of an input digital audio signal.
摘要:
A semiconductor device includes an internal circuit and an internal voltage generation circuit which generates an internal voltage stabilized with respect to a variation of the power supply voltage supplied from the outside and supplies the internal voltage to the internal circuit. The internal voltage generation circuit performs control so that when the power supply voltage rises to exceed a predetermined value, an operation of stabilizing the internal voltage is stopped to cause the internal voltage to increase with the rise of the power supply voltage.
摘要:
To cancel a delay time that occurs in a delay circuit due to temperature and voltage changes. The delay circuit includes a plurality of first and second inverters that are each composed of an N-channel first transistor and a P-channel second transistor connected in series, and P-channel third transistors that are connected between a first power supply wiring and the input nodes of the second inverters. According to the present invention, the presence of the third transistors cancels characteristic variations of the second transistors included in the respective plurality of inverters even if there are changes in temperature, voltage, etc. Consequently, when temperature, voltage, or the like changes, variations in the amount of delay of the entire delay circuit can be regarded as resulting from characteristic variations of the first transistors.
摘要:
In an aspect of the invention, a primary storage system (P system) manages write times of write data of one or more primary volumes (P volumes). The P system sequentially sends journals including write data of the P volumes and values indicating order of writing the write data of the P volumes to the secondary storage system (S system). The S system sequentially stores the write data in the journals from the P system to one or more secondary volumes (S volumes) according to the values. The S system sends identification information on the latest write data of the S volumes to the P system. The P system sends a management system information to indicate the latency between the write time of the data identified with the identification information and the write time of the latest data of the P volumes at the time of receipt of the identification information.
摘要:
A memory system of a high-speed operation can be realized by reducing an influence of reflection signals etc. caused by branching and impedance mismatching in various wirings between a memory controller and a memory module, and an influence due to transmission delays of data, command/address, and clocks in the memory module. To this end, a memory system comprises a memory controller and a memory module mounted with DRAMs. A buffer is mounted on the memory module. The buffer and the memory controller are connected to each other via data wiring, command/address wiring, and clock wiring. The DRAMs and the buffer on the memory module are connected to each other via internal data wiring, internal command/address wiring, and internal cock wiring. The data wiring, the command/address wiring, and the clock wiring may be connected to buffers of other memory modules in cascade. Between the DRAMs and the buffer on the memory module, high-speed data transmission is implemented using data phase signals synchronous with clocks.
摘要:
A semiconductor device, includes a first memory cell array, a second memory cell array, a command decoder configured to produce a transfer command to transfer a data stored in a first area of the first memory cell array to a second area of the second memory cell array, when receiving a read command to the first memory cell array and sequentially a write command to the second cell memory array, a first address generator configured to produce a first internal address for designating the first area of the first memory cell array when receiving the transfer command from the command decoder; and a second address generator configured to produce a second internal address for designating the second area of the second memory cell array when receiving the transfer command from the command decoder.
摘要:
A remote copy system comprises a primary storage system having a primary volume, and a secondary storage system having a secondary volume forming a pair relationship with the primary volume. When the primary storage system receives a write command from a primary host computer, it stores the command in the primary volume and creates a journal added with time information. The secondary storage system receives the journal from the primary storage system and updates the secondary volume based on the received journal. The primary host computer determines, based on the operating status of the secondary storage system, either the time added to the latest journal that the secondary storage system received or the time added to the latest journal that updated the secondary volume as the recovery point objective, and provides the determined time this to the user.