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JP2005222668A - Ram cell using thyristor - Google Patents

Ram cell using thyristor Download PDF

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Publication number
JP2005222668A
JP2005222668A JP2004059767A JP2004059767A JP2005222668A JP 2005222668 A JP2005222668 A JP 2005222668A JP 2004059767 A JP2004059767 A JP 2004059767A JP 2004059767 A JP2004059767 A JP 2004059767A JP 2005222668 A JP2005222668 A JP 2005222668A
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ram
memory
thyristor
current
fet
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Masahito Utsugida
正仁 櫨田
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Abstract

<P>PROBLEM TO BE SOLVED: To accelerate the speed for input/output to the memory for a CPU in a computer to be higher than those in the conventional technology. <P>SOLUTION: Since current-voltage conversion is performed, using an FET for resistance substitution to memory effect of current mode which uses a GTO thyristor, a device is made smaller than S-RAM, in terms of the occupancy area and also is made shorter than D-RAM, in terms of data input/output time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

産業上の利用分野Industrial application fields

この発明はコンピューターのメモリーに関する。  The present invention relates to a memory of a computer.

発明の概要Summary of the Invention

この発明は、コンピューターのメモリーにおいて、コンデンサ−等の従来のメモリー素子を用いず、ゲート電圧で電流を制御できるGTO(Gate Turn Off)サイリスタを使用することで電流モードのメモリー機能を持たせ、抵抗によって電流−電圧変換を行い、電圧出力を得られるようにしたものである。  The present invention provides a current mode memory function by using a GTO (Gate Turn Off) thyristor that can control the current with a gate voltage without using a conventional memory element such as a capacitor in a memory of a computer. Is used to obtain a voltage output by performing current-voltage conversion.

コンピュ−タ−のデ−タ処理のスピ−ドはCPUの処理速度によっており、その処理時間の大部分をメモリ−とのデ−タの入出力に取られている。そのメモリ−セルは、D−RAMでのメモリー素子はコンデンサであり、自然放電に対するリフレシュ動作とそのアクセス方法によるセンスアンプの安定化までのプリチャージタイムがメモリーアクセス高速化への問題であった。また、S−RAMでは、メモリー機能がフリップフロップによる結線構造にあり、出力はラインを読むだけで済むのでアクセスは速いのだが、RAMセルの構成素子数が多いのと配線が多少複雑なので占有面積が大きく、また、1ビット当たりのコストもD−RAMよりも大きいので、コスト面からコンピューターへの大量使用は敬遠されていた。
そこで、RAMセルのメモリー素子をサイリスタ素子に変えることでリフレシュ動作とプリチャージタイムにかかる時間を省き、また、S−RAMよりもクロス配線等のRAMセルの配線を簡素化することもできる。
[発明の開示]
The speed of the data processing of the computer depends on the processing speed of the CPU, and most of the processing time is taken into the data input / output with the memory. In the memory cell, the memory element in the D-RAM is a capacitor, and the refresh operation against the natural discharge and the precharge time until the sense amplifier is stabilized by the access method are problems for increasing the memory access speed. In addition, in the S-RAM, the memory function is a connection structure using flip-flops, and the output is only required to read the line, so the access is fast. However, since the number of constituent elements of the RAM cell is large and the wiring is somewhat complicated, the occupied area In addition, since the cost per bit is larger than that of the D-RAM, the large-scale use for a computer has been avoided.
Therefore, by changing the memory element of the RAM cell to a thyristor element, the time required for the refresh operation and the precharge time can be omitted, and the wiring of the RAM cell such as the cross wiring can be simplified as compared with the S-RAM.
[Disclosure of the Invention]

発明が解決しようとする問題点Problems to be solved by the invention

近年、コンピューターのシステム・クロックは次第に速くなり、CPUがメモリーをアクセスする時にWaitを掛けるのは避けられない状況となっている。それは、D−RAMがメモリーセルからデータを呼び出すのに 60ns〜80ns程時間がかかり、この時間がシステム・クロックの一周期の時間より遅いためにこうなるのである。
この発明は、CPUのメモリーへのアクセスにWaitを掛ける為に遅くなる問題点を解決しようとするものである。また、リフレッシュ動作なし、プリチャ−ジタイム無しのためにD−RAMよりも速くアクセス出来るためである。
In recent years, computer system clocks have become increasingly faster, and it is inevitable that the CPU will multiply the wait when accessing the memory. This is because it takes about 60 ns to 80 ns for the D-RAM to recall data from the memory cell, and this time is slower than the period of one cycle of the system clock.
The present invention is intended to solve the problem of slowness due to the wait for CPU access to memory. This is also because access is faster than D-RAM because there is no refresh operation and no precharge time.

問題点を解決するための手段Means to solve the problem

この為、この発明においては、CPUのメモリーへのアクセスにおいてWaitを入れないように、メモリーの書き込み、読み出し動作を速くしている。  For this reason, in the present invention, the writing and reading operations of the memory are speeded up so that no wait is entered when the CPU accesses the memory.

発明の効果The invention's effect

この発明によりCPUのメモリ−へのアクセスがWait無しで出来るようになり、また、D−RAMのようにリフレシュ動作も必要なく、結果としてCPUは数倍の速さでメモリ−をアクセス出来るようになる。  According to the present invention, the CPU memory can be accessed without waiting, and no refresh operation is required unlike the D-RAM. As a result, the CPU can access the memory several times faster. Become.

図1が本発明のRAMセルである。
回路図はメモリー機能を持つGTO(Gate Turn Off)サイリスタと電流制限をする抵抗代用のFET、サイリスタのゲ−ト抵抗用のFET、それにメモリ−セルからデ−タの入出力を受け持つトランジスタ(FET)の4チップから構成されている。
このRAMセルに1を書き込むとGTOサイリスタがONとなり、電流を制限する抵抗代用のFETに電圧が発生し、RAMセルのロジックとしては1になる。この1を入出力用のトランジスタ(FET)で読みだす。また、このRAMセルに0を書き込むとGTOサイリスタがOFFとなり、出力線は抵抗代用FETでプル・ダウンされ、RAMセルのロジックとしては0になり、読みだすときはこの0を入出力用のFETで読みだす。電流制限用のFETはディプレッション型を用い、この抵抗値はGTOサイリスタの保持電流と出力レベルに密接な関係がある。さらに、GTOサイリスタに電流を供給するI線が必要となる。しかし、このRAMセルに対しての配線はGTOサイリスタに電流を供給するI線とセルを選択するセレクター線、それにデータを入出力するビット線の3本だけですむ。
FIG. 1 shows a RAM cell of the present invention.
The circuit diagram shows a GTO (Gate Turn Off) thyristor with a memory function, a resistance substitute FET for current limiting, a thyristor gate resistance FET, and a transistor (FET) that handles data input / output from the memory cell. ) 4 chips.
When 1 is written in the RAM cell, the GTO thyristor is turned on, a voltage is generated in the resistor substitute FET that limits the current, and the RAM cell logic becomes 1. This 1 is read out by an input / output transistor (FET). Also, when 0 is written to this RAM cell, the GTO thyristor is turned OFF, and the output line is pulled down by the resistor substitute FET, and the logic of the RAM cell becomes 0. When reading, this 0 is input / output FET. Read it out. A depletion type FET is used as the current limiting FET, and the resistance value is closely related to the holding current of the GTO thyristor and the output level. Furthermore, an I line for supplying current to the GTO thyristor is required. However, there are only three wirings for this RAM cell: an I line that supplies current to the GTO thyristor, a selector line that selects the cell, and a bit line that inputs and outputs data.

Claims (1)

コンデンサ−等の従来のメモリー素子を使用せず、メモリー素子にサイリスタ素子を使うことで電流モードのメモリー機能を持たせ、抵抗代用のFETで電流−電圧変換を行う事によりスタティック−RAM(以下、S−RAM)より配線を簡素化し、また、センスアンプを使用しない事でダイナミック−RAM(以下、D−RAM)より高速にアクセス出来るようにしたRAMセル。By using a thyristor element as a memory element without using a conventional memory element such as a capacitor, a current mode memory function is provided, and a current-voltage conversion is performed by a resistor-substituting FET to obtain a static-RAM (hereinafter, referred to as a static-RAM). A RAM cell in which wiring is simplified from that of S-RAM, and access is made faster than dynamic RAM (hereinafter referred to as D-RAM) by not using a sense amplifier.
JP2004059767A 2004-02-04 2004-02-04 Ram cell using thyristor Pending JP2005222668A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015158964A (en) * 2014-02-24 2015-09-03 正仁 櫨田 RAM cell using thyristor
JP2016110681A (en) * 2014-12-08 2016-06-20 正仁 櫨田 Ram cell using thyristor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015158964A (en) * 2014-02-24 2015-09-03 正仁 櫨田 RAM cell using thyristor
JP2016110681A (en) * 2014-12-08 2016-06-20 正仁 櫨田 Ram cell using thyristor

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