JPS59225422A - Bidirectional bus buffer - Google Patents

Bidirectional bus buffer

Info

Publication number
JPS59225422A
JPS59225422A JP58099147A JP9914783A JPS59225422A JP S59225422 A JPS59225422 A JP S59225422A JP 58099147 A JP58099147 A JP 58099147A JP 9914783 A JP9914783 A JP 9914783A JP S59225422 A JPS59225422 A JP S59225422A
Authority
JP
Japan
Prior art keywords
output
input
buffer
logical gate
dart
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP58099147A
Other languages
Japanese (ja)
Other versions
JPH0437447B2 (en
Inventor
Hiroaki Suzuki
宏明 鈴木
Tadahiro Kuroda
忠広 黒田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP58099147A priority Critical patent/JPS59225422A/en
Publication of JPS59225422A publication Critical patent/JPS59225422A/en
Publication of JPH0437447B2 publication Critical patent/JPH0437447B2/ja
Granted legal-status Critical Current

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  • Information Transfer Systems (AREA)
  • Logic Circuits (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To realize a bidirectional buffer without requiring a bus terminator by providing a logical gate having a data protecting function to a bus buffer path so as to fix a bus line to a high level or a low level while the bus line is not in use. CONSTITUTION:An output of a logical gate 21 is connected to an input of a 3- state output buffer 22 and an output of a logical gate 23 is connected to an input of a tri-state output buffer 24. An output of the tri-state output buffer 24 and an input of the logical gate 21 are connected to a connecting terminal 25 of the bus line 1 and an output of the tri-state output buffer 22 and an input of the logical gate 23 are connected to a connecting terminal 26 of the bus line 2. Further, an output/input terminal of a positive feedback logical gate 27 is connected between input and output terminals of the logical gate 21 and output/input terminals of a positive feedback logical gate 28 are connected between input/output terminals of the logical gate 23. The bidirectional bus buffer is obtained with simple constitution like this.

Description

【発明の詳細な説明】 ソファに関する。[Detailed description of the invention] Regarding sofas.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

従来の双方向性パス・パ、ファの一例をit図に示す。 An example of a conventional bidirectional path is shown in an IT diagram.

この双方向性パス・バッファはパスライン1.2間に介
挿され、3.4は制御信号φl 、φ2によシ動作する
クロ、クドインバータ、5.6はインバータである。ク
ロックドインバータ3、インバータ5は経路P、方向に
縦続接続され、クロックドインバータ4、インバータ6
は経路P2方向に縦続接続される。7゜8は端子で、こ
の端子はパスラインJ、2に接続され、一方パスライン
の使用方向及び遮断状況に応じて制御信号φ1 、φ2
が与えられ、経路P1eP2が形成または遮断される。
This bidirectional path buffer is inserted between the path lines 1.2, 3.4 is a clock inverter operated by control signals φl and φ2, and 5.6 is an inverter. The clocked inverter 3 and the inverter 5 are connected in cascade in the direction of the path P, and the clocked inverter 4 and the inverter 6
are cascaded in the direction of path P2. 7゜8 is a terminal, which is connected to the pass lines J, 2, and control signals φ1, φ2 depending on the usage direction and cut-off status of the pass line.
is given, and path P1eP2 is formed or blocked.

しかしながら上記従来の回路形式では、インバータ5.
6は選択されない経路にあっても、選択された経路側か
ら動作させられ、0M08回路    □構成の場合消
費電力が増大する問題があった。
However, in the conventional circuit type described above, the inverter 5.
6 is operated from the selected path side even if it is on an unselected path, and the 0M08 circuit □ configuration has the problem of increased power consumption.

そこで改良を加えた一例が第2図に示す回路である。第
1図との相異点は、インバータ5,6の代シに2人カナ
ンドp−ト9,10を用い、各々制御信号φ1 、φ2
を与えたことである。
An example of an improved circuit is shown in FIG. 2. The difference from FIG. 1 is that two-man converters 9 and 10 are used in place of inverters 5 and 6, and control signals φ1 and φ2 are used, respectively.
was given.

このようにナンドダート9.10を設けたことにより、
遮断される経路PlまたはP2ではナンドダート9また
は10の出力が常に高レベルに保たれ、上記第1図の問
題点は解決される。
By providing Nando Dart 9.10 in this way,
In the blocked path Pl or P2, the output of the NAND dart 9 or 10 is always kept at a high level, and the problem shown in FIG. 1 is solved.

しかし通常パスラインには、複数個のシステムのダート
入力が接続されている。いまパスラインに信号がのって
いない時、第2図の回路ではパスライン1.2共に開放
状態となシ、容易に電位の変動が起こシ得る。その結果
上記複数個のシステムのダート入力が変動し、それに伴
なう電源間の貫通電流によシシステムの消費電力が増す
。従って未使用時のパスライン162は高レベルか低レ
ベルに保持されていることが望まれる□。そこで従来社
J第3図の如く双方向性ハス・バッフγ11と−に、パ
ス・ターミネータと呼はれる保持回路12.13が併用
されていたが、この構成では双方向性パス・バッファJ
 J、1個当シバス・ターミネータが2組必要となり、
システム構成に面倒があった。
However, the pass line typically has the dart inputs of multiple systems connected to it. When no signal is present on the pass line, both pass lines 1 and 2 are open in the circuit of FIG. 2, and potential fluctuations can easily occur. As a result, the dart inputs of the plurality of systems fluctuate, and the resulting through current between the power supplies increases the power consumption of the systems. Therefore, it is desirable that the pass line 162 be held at a high level or a low level when not in use. Therefore, holding circuits 12 and 13 called path terminators were used together with the bidirectional hash buffers γ11 and -, as shown in Fig. 3 of the conventional company J.
J, 2 sets of Shivas Terminator are required,
There was some trouble with the system configuration.

〔発明の目的〕 本発明は上記実情に鑑みてなされたもので、従来の如く
パス・ターミネータを必要とせずに低消費電力化が可能
となる双方向性パス・バッファを提供しようとするもの
である。
[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and aims to provide a bidirectional path buffer that can reduce power consumption without requiring the conventional path terminator. be.

〔発明の概要〕[Summary of the invention]

本発明は上記目的を達成するため、パス・バッファ経路
に設けられる論理ダートにデータ保持機能をもたせ、パ
スライン未使用時に、パスラインを高レベル或いは低レ
ベルに固定しておくことができるようにしたものでおる
In order to achieve the above object, the present invention provides a data retention function to the logical dirt provided in the path buffer path, so that the path line can be fixed at a high level or a low level when the path line is not in use. It's what I did.

〔発明の実施例〕[Embodiments of the invention]

以下図面を参照して本発明の一実施例を説明する。第4
図に示す如く論理ff −) 2 Jの出力を3ステー
ト出力パツフア22の入力に接続し、論理ゲート23の
出力を3ステート出力バツ7ア24の入力に接続する。
An embodiment of the present invention will be described below with reference to the drawings. Fourth
As shown in the figure, the output of the logic ff-)2J is connected to the input of the 3-state output buffer 22, and the output of the logic gate 23 is connected to the input of the 3-state output buffer 24.

3ステート出力バツフア24の出力と論理ダート21の
入力とをパスラインlの接続端子25に接続し、3ステ
ート出カバ、ファ22の出力と論理ダート23の入力と
をパスライン2の接続端子26に接続する。論理ダート
21の入出力端間には正帰還論理ゲート27の出入力端
を接続し、論理ダート23の入出力端間には正帰還論理
ダート28の出入力端を接続する。
The output of the 3-state output buffer 24 and the input of the logic dart 21 are connected to the connection terminal 25 of the pass line 1, and the output of the 3-state output buffer 22 and the input of the logic dart 23 are connected to the connection terminal 26 of the pass line 2. Connect to. The input and output terminals of a positive feedback logic gate 27 are connected between the input and output terminals of the logic dart 21, and the input and output terminals of a positive feedback logic gate 28 are connected between the input and output terminals of the logic dart 23.

第5図は第4図の一具体例でめ9、論理ダートj!l 
、23をインバータjJ1*231で実現し、3ステー
ト出力バッフ了22.24をクロックドインバータ22
1 .24.で実現し、正帰還論理?”−ト27,2B
をイ7ノZ  p 271  I281で実繞している
Figure 5 is a specific example of Figure 4.9, Logic Dirt j! l
, 23 is realized by the inverter jJ1*231, and the 3-state output buffer end 22.24 is realized by the clocked inverter 22.
1. 24. Realized with positive feedback logic? ”-To 27, 2B
It is carried out in I7 no Z p 271 I281.

上記のようにパス久方論理ダート211 m231に正
帰還論理r−ト271  # 281を設けることによ
シ、データ保持機能が生じる。従ってパスライン1,2
の未使用時に該ノfスラインを高レベル或いは低レベル
に保持し尤おくことができ、低消費電力化が可能となる
ものである。
By providing the positive feedback logic gate 271 #281 in the pass logic gate 211 m231 as described above, a data retention function is generated. Therefore, pass line 1, 2
When not in use, the f line can be held at a high level or a low level, making it possible to reduce power consumption.

システム構成の状況に応じては、上記正帰還ダートは片
方の経路だけで充分な場合もある。
Depending on the system configuration, it may be sufficient to use only one path of the positive feedback dart.

その応用例を第6図に示す。An example of its application is shown in FIG.

第7図は上記正帰還論理ダートを、制御信号φ1 、φ
2で制御したクロ、クドインバータ282 * J y
= (φl 、φ3はφ1 lφ2の反転パルス)で実
現した応用例である。ここでクロ、クドインバータ22
1の出力が70−ティングの時、クロックドインバータ
282の出力でパスライン20レベルを固定する。一方
クロ、クドイ/パータ241の出力がフローティングの
時、クロックドインバータ222の出力でパスライン1
0レベルを固定するものである。
FIG. 7 shows the positive feedback logic darts, control signals φ1, φ
2 controlled black inverter 282 * J y
= (φl, φ3 are inverted pulses of φ1 lφ2). Here, Kuro, Kudo inverter 22
When the output of the clocked inverter 282 is 70-ting, the level of the pass line 20 is fixed by the output of the clocked inverter 282. On the other hand, when the output of the clocked inverter 222 is floating, the pass line 1 is
This is to fix the 0 level.

第8図はパース入力論理ダートにナンドダート21、、
J!、を用い、これをクロックパルスφ1 、φ2で制
御した応用例である。云うまでもなく他のダートで実現
した場合も本発明に該当することは勿論である。第8図
ではノ9ルスφ五が低レベルの時のクロ、クドインパー
タ22゜のフローティングをナンドダート21.で防ぎ
、このゲート213の高レベル出力でパスライン1のフ
ローティングをなくす。二方パルスφ2が低レベルの時
のクロックドインバータ241の70−ナイング全ナン
ドr−ト232で防ぎ、このp−ト232の筒レベル出
力でパスライン2のフローティングをなくすようにして
いる。
Figure 8 shows Nando dart 21 in the parse input logic dart.
J! , and is controlled by clock pulses φ1 and φ2. Needless to say, the invention also falls under the scope of the present invention if it is realized using other darts. In Fig. 8, when the No. 9 Lus φ5 is at a low level, the floating of the Kuro and Kudo Impata 22 degrees is shown by the Nando Dart 21. The high level output of this gate 213 eliminates the floating of the pass line 1. When the two-way pulse φ2 is at a low level, the 70-ning of the clocked inverter 241 is prevented by the entire NAND 232, and the floating of the pass line 2 is eliminated by the cylinder level output of this PT 232.

本発明は双方向性パス・バッファの入、出力部分の回路
構成に係わるものであシ、従って上記入出力回路の間に
、第9図の如く他の機能を有する回路31.32等が構
成されている場合も本発明に該当する。
The present invention relates to the circuit configuration of the input and output portions of a bidirectional path buffer, and therefore, circuits 31 and 32 having other functions as shown in FIG. 9 are constructed between the input and output circuits. The invention also falls under the present invention.

上記実施例では、制御信号φ1 、φ2によシ開閉する
論理ダートとして図示のクロックドインバータを用いた
が、これは他の論理ダートの組み合わせで実現した場合
も同様であり、本発明に該当する。第10図に伝送ゲー
ト222 *づ42及びインバータ223.243を用
いたクロックドインバータによる実施例を示す。
In the above embodiment, the clocked inverter shown in the figure is used as the logic dart that is opened and closed by the control signals φ1 and φ2, but the same applies to the case where it is realized by a combination of other logic darts, which falls under the present invention. . FIG. 10 shows an embodiment using a clocked inverter using a transmission gate 222 *42 and inverters 223 and 243.

上記実施例によれば次の利点が具備される。According to the above embodiment, the following advantages are provided.

即ち従来はシステム構成に、第3図の如く双方向ハス・
バッファIC1個に対し、パスターミネータICが2個
必要であったが、本発明によシパス・ターミネータIC
が全く不要に・な勺、システム構成が簡単になる。また
本発明ではデータ・ホールド機能を有するため、パスラ
インのレベルが固定され、ノイズ等によるパスラインの
ゆらぎによるシステムのCMOSダートの貫通電流がな
くなシ、低消費電力化が実現できる。また本1回路は、
システム構成用の双方向性パス・バッファICを念頭に
置いているが、IC内部の回路にも適用でき、その際第
3図の従来技術に比べ第5図に示す構成をとれば、イン
バータ数が2個減るから、素子数がパスライン1本当り
4個減るものである。
In other words, in the past, the system configuration included a bidirectional hash as shown in Figure 3.
Two path terminator ICs were required for one buffer IC, but with the present invention, two path terminator ICs are required.
This eliminates the need for system configuration. Further, since the present invention has a data hold function, the level of the pass line is fixed, and there is no through current in the CMOS dart of the system due to fluctuation of the pass line due to noise, etc., and low power consumption can be realized. Also, this 1 circuit is
Although we have in mind a bidirectional path buffer IC for system configuration, it can also be applied to circuits inside the IC, and in that case, if the configuration shown in Figure 5 is adopted compared to the conventional technology shown in Figure 3, the number of inverters can be reduced. Since the number of elements decreases by two, the number of elements decreases by four per pass line.

〔発明の効果〕〔Effect of the invention〕

以上説明した如く本発明によれば、構成が簡単化され、
また低消費電力化が可能となる等の利点を有した双方向
性バス・バッファが提供できるものである。
As explained above, according to the present invention, the configuration is simplified,
Furthermore, it is possible to provide a bidirectional bus buffer that has advantages such as low power consumption.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来の双方向性パス・バッフ、回路図、第2図
はこれに改良を加えた双方向性パス・バッファ回路図、
第3図は他の従来例を示す双方向性バス・バッファ回路
図、第4図は本発明の一実施例を示す構成図、第5図は
同構成の具体的回路図、第6図ないし第1θ図は本発明
の他の実施例を示す回路図である。 1.2・・・パスライン、21.23・・・論理ダート
、22.24・・・3ステート出力パツフア、27.2
8・・・正帰還論理?−)。 出罪人代理人  弁理士 鈴 江 武 彦第1図 第2wJ 第4図 第6図、 81
Figure 1 is a circuit diagram of a conventional bidirectional pass buffer, and Figure 2 is a circuit diagram of an improved bidirectional pass buffer.
FIG. 3 is a bidirectional bus buffer circuit diagram showing another conventional example, FIG. 4 is a configuration diagram showing an embodiment of the present invention, FIG. 5 is a specific circuit diagram of the same configuration, and FIGS. FIG. 1θ is a circuit diagram showing another embodiment of the present invention. 1.2... Pass line, 21.23... Logic dart, 22.24... 3-state output puffer, 27.2
8...Positive feedback logic? -). Attorney for the accused Patent attorney Takehiko Suzue Figure 1 Figure 2 wJ Figure 4 Figure 6, 81

Claims (1)

【特許請求の範囲】[Claims] 第1の論理ダートの出力を第1の3ステート出力パツフ
アの入力に接続し、第2の論理ダートの出力を第2の3
ステート出カツ々ツフアの入力に接続し、この第2の3
ステート出カツ4ツフアの、出力と前記第1の論理ダー
トの入力とを第1の接続端で接続し、前記第1の3ステ
ート出カパツフアの出力と前記第2の論理ダートの入力
とを第2の接続端で接続し、前記第1.第2の論理f−
)の少くとも一方のダートにおいてダート出力からダー
ト入力に正帰還がかかるような正帰還論理ダートを接続
したことを特徴とする双方向性パス・パ、ファ。
The output of the first logic dart is connected to the input of the first three-state output puffer, and the output of the second logic dart is connected to the input of the second three-state output puffer.
Connect the state output to the input of the
The output of the state output 4-puffer and the input of the first logic dart are connected at a first connection end, and the output of the first 3-state output buffer and the input of the second logic dart are connected at the first connection end. 2 connection end, and said 1st. second logic f-
), wherein a positive feedback logic dart is connected in at least one dart such that positive feedback is applied from the dart output to the dart input.
JP58099147A 1983-06-03 1983-06-03 Bidirectional bus buffer Granted JPS59225422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58099147A JPS59225422A (en) 1983-06-03 1983-06-03 Bidirectional bus buffer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58099147A JPS59225422A (en) 1983-06-03 1983-06-03 Bidirectional bus buffer

Publications (2)

Publication Number Publication Date
JPS59225422A true JPS59225422A (en) 1984-12-18
JPH0437447B2 JPH0437447B2 (en) 1992-06-19

Family

ID=14239577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58099147A Granted JPS59225422A (en) 1983-06-03 1983-06-03 Bidirectional bus buffer

Country Status (1)

Country Link
JP (1) JPS59225422A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223217A (en) * 1984-04-19 1985-11-07 Mitsubishi Electric Corp Dynamic bus circuit
JPS60223218A (en) * 1984-04-19 1985-11-07 Mitsubishi Electric Corp Dynamic bus circuit
JPS61208251A (en) * 1985-03-12 1986-09-16 Matsushita Electronics Corp Integrated circuit device
JPS62287711A (en) * 1986-06-05 1987-12-14 Nec Corp Buffer device
JPS63128813A (en) * 1986-11-18 1988-06-01 Nec Corp Semiconductor integrated circuit device
JPS63209218A (en) * 1987-02-25 1988-08-30 Nec Corp Bidirectional interface circuit
JP2013236365A (en) * 2012-04-13 2013-11-21 Semiconductor Energy Lab Co Ltd Isolator circuit and semiconductor device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7248249B2 (en) 2018-08-17 2023-03-29 慶應義塾 Communication circuit and communication method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5592057A (en) * 1978-12-29 1980-07-12 Fujitsu Ltd Circuit for extending two-way transmission path

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5592057A (en) * 1978-12-29 1980-07-12 Fujitsu Ltd Circuit for extending two-way transmission path

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223217A (en) * 1984-04-19 1985-11-07 Mitsubishi Electric Corp Dynamic bus circuit
JPS60223218A (en) * 1984-04-19 1985-11-07 Mitsubishi Electric Corp Dynamic bus circuit
JPH053606B2 (en) * 1984-04-19 1993-01-18 Mitsubishi Electric Corp
JPH053605B2 (en) * 1984-04-19 1993-01-18 Mitsubishi Electric Corp
JPS61208251A (en) * 1985-03-12 1986-09-16 Matsushita Electronics Corp Integrated circuit device
JPS62287711A (en) * 1986-06-05 1987-12-14 Nec Corp Buffer device
JPS63128813A (en) * 1986-11-18 1988-06-01 Nec Corp Semiconductor integrated circuit device
JPS63209218A (en) * 1987-02-25 1988-08-30 Nec Corp Bidirectional interface circuit
JP2013236365A (en) * 2012-04-13 2013-11-21 Semiconductor Energy Lab Co Ltd Isolator circuit and semiconductor device

Also Published As

Publication number Publication date
JPH0437447B2 (en) 1992-06-19

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