Hitachi, Ltd.

Hitachi Device Engineering Co., Ltd.

Renesas Technology Corp.

Hitachi Microcomputer Engineering, Ltd.

Akita Electronics Co., Ltd.

Hisayuki Higuchi

Noriyuki Homma

Makoto Suzuki

Koichiro Ishibashi

Suguru Tachibana

Kenichi Osada

Hiroaki Nambu

Kunihiko Yamaguchi

Yoshiaki Sakurai

Tokuo Kure

Yoichi Tamaki

Kazuo Kanetani

Youji Idei

Keijiro Uehara

Kiyoo Itoh

Goro Kitsukawa

Katsuhiro Shimohigashi

Kazutaka Mori

Takahide Ikeda

Masanori Odaka

Shinichiro Mitani

Akira Sato

Nobuo Tamba

Yoshinobu Nakagome

Kazuo Yano

Mitsuru Hiraki

Takeo Shiba

Susumu Narita

Takehisa Hayashi

Isao Yoshida

Shinichi Yoshioka

Ikuya Kawasaki

Tohru Nakamura

Tadahiko Nishimukai

Makoto Hanawa

Yoji Idei

Shuuichi Miyaoka

Kenichi Ohhata

Akio Hayasaka

Masayuki Ohayashi

Toshiro Hiramoto

Noriyuki Honma

Toshikazu Arai

Hiroshi Higuchi

Saneaki Tamaki

Kayoko Saito

Toshinobu Shinbo

Kenichi Ohata

Ken'ichi Ohata

A semiconductor memory apparatus is provided with a memory array, a first global bit line connected to a sense amplifier, a second global bit line connected to a write amplifier, and a selection circuit for connecting a plurality of bit lines selectively to the first global bit line and the second global bit line.

Semiconductor memory apparatus, semiconductor apparatus, data processing apparatus and computer system

A semiconductor device having a field effect transistor formed in a semiconductor layer provided on an insulating layer is provided with a body electrode electrically connected to a channel forming region of the field effect transistor, and a back gate electrode provided below the insulating layer so as to be opposed to the channel forming region of the field effect transistor. A potential for controlling carriers of conduction type opposite to a channel formed in an upper portion of the channel forming region of the field effect transistor is applied to each of the body electrode and the back gate electrode. Thus, the withstand voltage for the drain of the field effect transistor can be increased. It is also possible to stabilize the threshold voltage of the field effect transistor. Furthermore, the threshold voltage of the field effect transistor can be changed in a stable state.

Semiconductor device

A semiconductor integrated circuit, particularly a circuit for a high-speed low-power-consumption table look-aside buffer mounted in a microprocessor LSI. The semiconductor integrated circuit is provided with field effect transistors for comparing inputted multibit data signals with stored data and a coincidence-detecting signal line ( ) to which current is applied at least while the data signals are compared with stored data. When the data signals coincide with the stored data, the transistors ( ) conduct. The number of transistors ( ) is equal to that of the inputted data signals. The drains of the transistors ( are connected in parallel, and the sources are also connected in parallel and supplied with a predetermined voltage. By the integrated circuit, whether or not the inputted data signals coincide with the stored data is detected by detecting the potential of the coincidence-detecting signal line ( ) upon a change of the applied current.

Semiconductor integrated circuit

A semiconductor memory apparatus with a memory array, a first global bit line connected to a sense amplifier, a second global bit line connected to a write amplifier, and a selection circuit for connecting a plurality of bit lines selectively to the first global bit line and the second global bit line.

High speed semiconductor memory apparatus including circuitry to

A semiconductor integrated circuit device such as a data processing device having a set-associative translation look-aside buffer (TLB). A plurality of address arrays each have a second field for storing the value representing a page size. The values read from the second fields are used to change the range of address comparison by comparators. A plurality of data arrays each have a second field for storing a bit position address designating either an intra-page address or a page number following a page size change. The values read from the second fields of the address arrays are used as the basis for second selectors to select either an address in a predetermined location of an externally input virtual address or the address read from each of the second fields of the data arrays. The selected address is output as a physical address.

Translation lookaside buffer supporting multiple page sizes

A circuit technique suitable to attain a high speed of a memory which is constructed in a manner such that memory cells include a field effect transistor and peripheral circuits include a bipolar transistor and a field effect transistor. According to the invention, a bipolar transistor whose collector is connected to a differential amplifier and which supplies a current to the differential amplifier in accordance with a signal which is inputted to a base or an emitter is added, and a bipolar transistor to supply a current only when writing to bit lines is connected. According to the invention, a high speed of the access time when information is read out by switching the selection bit line is accomplished. Further, the charge/discharge time of the bit line when information is written is reduced and a high speed of the writing time can be also accomplished. The improvement of the drivers of word lines and bit lines is also disclosed and a semiconductor memory which can operate at a high speed as a whole semiconductor memory can be realized.

Bit-line drive circuit for a semiconductor memory

A semiconductor integrated circuit device including a level conversion circuit in which the simplifying of the circuit and the increasing of the speed of operation have been attained is provided. A pair of complementary output signals amplified to a required signal level by a current switch circuit including differential transistors which receive an input signal and a reference voltage are inputted into a pair of emitter follower circuits. An emitter follower output transistor is driven by an output signal from one emitter follower circuit, while an N-channel MOSFET provided between the output transistor and a current source used as a load is driven by an output signal from the other emitter follower circuit, to obtain a level-amplified output signal from an emitter of the output transistor. The speed of an operation of the circuit device can be increased to a high level owing to a simple circuit in which a level, which is required to attain an output amplitude, of complementary output signals is secured by the current switch circuit, the amplified complementary signals being inputted into the emitter follower circuit to directly drive the output transistor.

Semiconductor integrated circuit device and memory consisting of

In a first embodiment of a CAM (Content Addressable Memory) or cache memory of the present invention disclosed herein, comparing information stored in a memory cell with comparison input information is accomplished in a comparison circuit without first converting a readout current from the memory cell into voltage information. In another embodiment, a matching detection between first stored information outputted from a first memory cell array and second stored information outputted from a second memory cell array is accomplished by an integrally formed sensing and matching detection circuit which is characterized as having both sensing and matching detection capabilities. That is, the sensing and matching detection circuit senses both stored information and thereafter detects matching based on a sensing result.

Semiconductor associative memory device with current sensing

A cache memory apparatus made up of a memory cell array (300) and a match detection circuit is disclosed. The match detection circuit produces a detection signal related to whether a search data coincides with a data read out of the memory cell array (300). The match detection circuit applies complementary signals (d, d) of the data read from the memory cell array (300) to the bases of bipolar differential transistors (10, 11), the gates of a pair of field effect transistors (16, 17) are supplied with complementary signals (a, a) of the search data, and the bases of a pair of emitter-follower transistors (12, 13) are connected to the collectors of the bipolar differential transistors (10, 11), thereby producing a detection signal (HITO) from the jointly-connected emitters thereof.

Match detection circuit for cache memory apparatus

The disclosure includes feeding a current I.sub.R to only BIT lines selected, or feeding current I.sub.R transiently to only the BIT lines switched from unselected to selected states; and a sense amplifier for detecting the difference between the currents flowing in selected BIT lines to read out stored information, wherein current I.sub.R and cell current I.sub.cell have a relation of I.sub.R &gt;I.sub.cell. The BiC MOS memory has high speed, low power and high integration density. Diodes are provided between the memory cell and the BIT lines.

Semiconductor cell memory with current sensing

Growing community of inventors

Kokubunji, Japan

Hisayuki Higuchi