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JPS61211735A - Comparison circuit - Google Patents

Comparison circuit

Info

Publication number
JPS61211735A
JPS61211735A JP60053652A JP5365285A JPS61211735A JP S61211735 A JPS61211735 A JP S61211735A JP 60053652 A JP60053652 A JP 60053652A JP 5365285 A JP5365285 A JP 5365285A JP S61211735 A JPS61211735 A JP S61211735A
Authority
JP
Japan
Prior art keywords
output
carry
inverter
circuit
digit
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
JP60053652A
Other languages
Japanese (ja)
Other versions
JPH051495B2 (en
Inventor
Hidekazu Kudo
英一 工藤
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP60053652A priority Critical patent/JPS61211735A/en
Publication of JPS61211735A publication Critical patent/JPS61211735A/en
Publication of JPH051495B2 publication Critical patent/JPH051495B2/ja
Granted legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

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  • Manipulation Of Pulses (AREA)
  • Logic Circuits (AREA)
  • Design And Manufacture Of Integrated Circuits (AREA)

Abstract

PURPOSE:To arrange an optional column regularly without disturbing a regularity of a layout of a comparison circuit of the optional column by connecting a subordinate carry output to a carry input from a self column and the carry output to a carry input of a host column. CONSTITUTION:When a comparing numbers A, B are 1, 0, namely, A>B, an output of an inverter 102 to which one of the comparing number B is inputted is 1, an output of an NAND 100 is 0, an output of an inverter 101 is 1, an output of an NOR 103 is 0, and an output of an NOR 104 is 0, which are logic levels. Accordingly, transfer gates 106, 107 are turned OFF and a transfer gate 105 is turned ON to output 1 to a host carry terminal CO. When the comparing numbers A, B are 0, 1, namely A<B, the CO gates to 0. When the comparing numbers A, B coincide, the carry output terminal CO takes the same value as CI.

Description

【発明の詳細な説明】 (技術分野) 本発明は半導体集積回路で構成したマイクロコンビーー
タあるいは周辺装置等に使用される2進数の比較回路に
関し、特に絶縁ゲート型MOSトランジスタを用いた比
較回路に関する。
Detailed Description of the Invention (Technical Field) The present invention relates to a binary comparator circuit configured with a semiconductor integrated circuit and used in a microconverter or a peripheral device, and particularly relates to a comparator circuit using an insulated gate MOS transistor. Regarding.

(従来の技術) 従来知られている比較回路は第5図に示すように、2つ
の2進数A(上位よりA3 、A2 、AI 、AO)
並びにB(上位よりB3.B2.Bl 、Bo)の入力
に対してAND回路13からA=B、OR回路14゜1
5からA(13,A)Bが各々出力されるように構成さ
れている。
(Prior art) As shown in FIG. 5, a conventionally known comparison circuit uses two binary numbers A (A3, A2, AI, AO from the highest)
And for the input of B (B3.B2.Bl, Bo from the upper order), from the AND circuit 13, A=B, OR circuit 14゜1
5 to A(13,A)B, respectively.

(解決すべき問題点) この比較回路に於いて、各桁の各々の一致を示す一致回
路1,2,3.4は同一回路構成の故に規則的な配列化
が可能であるが、各桁の不一致を示すAND回路5,6
,7,8,9:10,11.12はその入力の数が違う
ため規則的な配列化力(不可能であり、レイアウトのレ
ギュラリティを乱し、又比較する桁数の増加に伴ない論
理の再、rJIt成も必要とカリ、拡張性に乏しい欠点
があった。
(Problems to be solved) In this comparison circuit, the matching circuits 1, 2, 3, and 4, which indicate matching of each digit, can be arranged regularly because they have the same circuit configuration. AND circuits 5 and 6 indicating the mismatch of
, 7, 8, 9: 10, 11.12 have different numbers of inputs, so regular arrangement is impossible (it is impossible, it disturbs the regularity of the layout, and as the number of digits to be compared increases) It also required logic reconfiguration and rJIt configuration, and had the disadvantage of poor scalability.

(発明の目的) 本発明の目的は、任意桁を規則的に配列することが可能
な比較回路を提供することにある。
(Object of the Invention) An object of the present invention is to provide a comparison circuit capable of regularly arranging arbitrary digits.

(問題点を解決するだめの手段) 本発明は2進数の2つの入力の不一致を検出する回路と
、一致を検出する回路と、2つの入力が一致している場
合下位桁の状態を上位に伝達するトランス7アーゲート
と、2つの入力が不一致の場合自桁の不一致の状態を上
位に伝達すべく該トランスファーゲートの出力に共通に
接続されゲートが自桁の犬、並びに小を示す不一致検出
回路出力が接続され、一方が他方と各々反転論理レベル
が入力さ在た2つのトランスファーゲートから構成され
る。
(Means for Solving the Problem) The present invention includes a circuit for detecting a mismatch between two inputs of binary numbers, a circuit for detecting a match, and a circuit for detecting a match between the two inputs. A mismatch detection circuit that is commonly connected to the output of the transfer gate to transmit the mismatch state of the own digit to the upper level when the two inputs do not match, and the gate indicates the dog of the own digit and the small. It consists of two transfer gates whose outputs are connected, one having an inverted logic level input to the other.

さらに、この比較回路を早桁縦続すべぐ最下位桁の桁上
げ入力を除く各桁桁上げ入力は各桁桁上げ出力を接続し
、最下位桁へは、比較数の各入力時間間隔内に[oJ 
、 rIJ又は[J 、 rOJに変化する入力を与へ
、最上位桁の桁上げ出力信号を前半サイクル結果を後半
サイクル迄保持する回路を設け、後生サイクルに一致或
は犬、小論理をとる如く構成することもできる。
Furthermore, each carry input except the carry input of the least significant digit connects each carry output to this comparison circuit, and the input to the least significant digit is performed within each input time interval of the comparison number. [oJ
, rIJ or [J, rOJ, a circuit is provided to hold the first half cycle result of the carry output signal of the most significant digit until the second half cycle. It can also be configured.

(実施例) 本発明の一桁の一実施例を第1図に示す。以下説明は正
論理で行なう。A、Bは比較すべき2進数の自桁が入力
さ扛る入力端子、102は比較する一方の入力端子Bに
接続さ扛反転出力を出すインバータ、100は比較する
一方の入力端子Aに他方がインバータ102に接続され
たN A N D  回路、101は前記NAND回路
100に接続さt反転出力を出すインバータ、103は
前記Aインバータ102に接続されたN0R1路、10
5はゲートがインバータ101に、ドレインが論理レベ
ル「1」を出す電源に、ソースが桁上げ出力端子COに
接続さ扛たトランスファーゲート、106はゲートがN
0RIQ3 に、ドレインが前記桁上げ出力端子COに
、ソースが論理レベル「0」を出すGNDに接続された
トランスファーゲート、107はドレインが下位桁上げ
入力端子CIに、ゲートがN0R104に、ソースが前
記COに接続されたトランスファーゲートで、これによ
り一桁の比較回路200が構成さ扛る。
(Embodiment) A single-digit embodiment of the present invention is shown in FIG. The following explanation will be based on positive logic. A and B are input terminals into which the own digit of the binary number to be compared is input, 102 is an inverter that outputs an inverted output connected to one input terminal B to be compared, and 100 is one input terminal A to be compared to the other. is an NAND circuit connected to the inverter 102, 101 is an inverter connected to the NAND circuit 100 and outputs an inverted output, 103 is an N0R1 path connected to the A inverter 102, 10
5 is a transfer gate whose gate is connected to the inverter 101, whose drain is connected to the power supply that outputs logic level "1", and whose source is connected to the carry output terminal CO; 106 is a transfer gate whose gate is N
0RIQ3, a transfer gate 107 whose drain is connected to the carry output terminal CO, whose source is connected to GND which outputs logic level "0", whose drain is connected to the lower carry input terminal CI, whose gate is connected to N0R104, and whose source is connected to the above-mentioned GND. With the transfer gate connected to CO, this constitutes a single-digit comparison circuit 200.

その動作を以下に説明する。比較数A、Bが11」、「
0」の場合、即ちA>Bでは一方の比較数Bが入力さ扛
るインバータ102の出力は「1」、NAND100出
力は「0」、インバータ101出力は「1」、N0R1
03出力は「0」、N0R104出力は「0」の論理レ
ベルとなる。従って、トランスファーゲート106,1
07は「OFF」 し、トランスファーゲート105は
1−ONJ l、上位桁上げ端子COに11」を出力す
る。比較数A、Bが「0」。
Its operation will be explained below. The comparison numbers A and B are 11", "
0", that is, when A>B, one comparison number B is input. The output of the inverter 102 is "1", the NAND100 output is "0", the inverter 101 output is "1", N0R1
The 03 output is at the logic level of "0" and the N0R104 output is at the logic level of "0". Therefore, transfer gate 106,1
07 is turned OFF, and the transfer gate 105 outputs 1-ONJ1 and 11 to the upper carry terminal CO. Comparison numbers A and B are "0".

「1」の場合、即ちA<Bではインバータ102の出力
は「0」、NANDloorlJ、インバータ101「
o」、N0R103rtJ 、NO:R104「OJ 
の論mレベルとなり、従ってトランスファーゲート10
5゜107は「OFF」 しトランスファゲート106
は「ON」となりCOは「0」となる。比較数A。
In the case of "1", that is, when A<B, the output of the inverter 102 is "0", and the output of the inverter 101 is "0".
o", N0R103rtJ, NO:R104"OJ
Therefore, the transfer gate 10
5°107 is “OFF” and transfer gate 106
becomes "ON" and CO becomes "0". Comparison number A.

Bが一致している場合、rOJ 、 rOJ又は[J、
Illの如くA=Bでは、インバータ101「0」 、
N0R103rOJ  、 N0R104rlJとなり
、トランスファゲート105.106は[OF FJ、
トランスファゲート107は「ON」し、桁上げ出力端
子COはCIと同値をとる。
If B matches, rOJ, rOJ or [J,
When A=B as in Ill, inverter 101 "0",
N0R103rOJ, N0R104rlJ, and transfer gate 105.106 is [OF FJ,
Transfer gate 107 is turned "ON" and carry output terminal CO takes the same value as CI.

ここでインバータ101はA)Bで、N0RIQ3はA
(Bで、N0R104はA=Bで11」の値をとる。即
ち、インバータ101、N0R103は不一致(犬、小
)を、N0R104は一致を現わす。
Here, the inverter 101 is A) B, and N0RIQ3 is A)
(At B, N0R104 takes a value of 11 when A=B. In other words, inverter 101 and N0R103 show a mismatch (dog, small), and N0R104 shows a match.

第1図で示した本発明の一実施例の真理値表を第2図に
示す。
FIG. 2 shows a truth table of one embodiment of the present invention shown in FIG.

第1図に於ける本発明の一桁の一実施例を多桁比較回路
に適用した場合(ここでは4桁)の一実施例を第3図に
示す。第4図は第3図の一実施例に於けるタイミング図
である。
FIG. 3 shows an example in which the one-digit embodiment of the present invention shown in FIG. 1 is applied to a multi-digit comparison circuit (here, four digits). FIG. 4 is a timing diagram in one embodiment of FIG. 3.

最下位桁の桁上げ入力端子CiOに第4図に示す如きク
ロックCLを入力する。各桁の桁上げ入力端子C1Nl
2 は各桁上げ出力端子C0(N−1)が接続さ扛る(
Nは1〜3の整数)。最上位桁上げ出力端子C03はイ
ンバータ206、N0R208゜N0R209と、ドレ
インがインバータ202へ接続され、インバータ202
はインバータ203へ接続さ扛、ドレインがインバータ
203にソースがインバータ202に接続されゲートが
クロックCLの逆相信号を生成すべく接続されたインバ
ータ205に接続され、ゲートがクロックCLに接続さ
れソースが最上位桁上げ出力端子CO3の論理レベルを
クロックCLI−QJの期間保持すべく接続さ扛る。即
ち、ラッチ210を構成する。
A clock CL as shown in FIG. 4 is input to the carry input terminal CiO of the least significant digit. Carry input terminal C1Nl for each digit
2, each carry output terminal C0 (N-1) is connected (
N is an integer from 1 to 3). The most significant carry output terminal C03 is connected to the inverter 206, N0R208°N0R209, and the drain is connected to the inverter 202.
is connected to the inverter 203, the drain is connected to the inverter 203, the source is connected to the inverter 202, the gate is connected to the inverter 205, which is connected to generate a signal with the opposite phase of the clock CL, the gate is connected to the clock CL, and the source is connected to the inverter 205. It is connected to hold the logic level of the most significant carry output terminal CO3 for the period of clock CLI-QJ. That is, the latch 210 is configured.

N0R207は前記インバータ206と、インバータ2
02と第4図に示す如きストローブクロック5CK75
f入力さ′nA>Bで「1」となる。該N0R208は
前記CO3以外にインバータ202と該ストローブクロ
ックSCKが入力され、A=Bで「1」となる。該N0
R209は前記CO3以外にインバータ203の出力と
、該ストローブクロックSCKに接続さ扛、A(Bで1
1」となる。Aは比較入力でありMSBからAa 、A
2 、AI 、AOを示す。Bは他の比較入力であI)
MSBからB3゜B2 、B+ 、Boを示す。又、比
較回路200は第1図に於ける一桁の比較回路と同じで
ある。A=Bに於いて、例えばA(A3.A2.AI、
AO)が(0゜0.1.0)、B(B3.B2.Bl、
BO)・が(o、o、i、o)では各桁のトランスファ
ーゲート107が[ONJし、C1o=cOO=cil
=co1=Ci2=Co2=Ci3=C03となる。即
ち、クロックCLの前半に於いてCo314rlJとな
りクロックCLが11」から10」に変化する時点でラ
ッチ210に11」が捕えられる。後半に於いてはクロ
ックCLは「0」となり、ラッチ210はクロックCL
の前半に於けるCo3の「1」を保持し、ラッチ210
の逆相出力を出すインバータ202は「0」、正相出力
を出すインバータ203は「1」となる。N0R209
はラッチ210の正相出力に接続されている為「0」と
なる。更に、Q==CiQ=(九〇−Cil=Co 1
=Ci 2=Co 2=Ci 3=Co 3 となり、
インバータ206の出力は「1」、故にN0R207は
「0」となる。A=Bを示すN0R208はC03=「
O」、ラッチ210の逆相出力は「0」であり、ストロ
ーブクロック5CKI−Oj  のタイミングで「1」
となる。故にA=Hの判定を示す。
N0R207 connects the inverter 206 and inverter 2.
02 and strobe clock 5CK75 as shown in Figure 4.
When f input 'nA>B, it becomes "1". The N0R 208 receives the inverter 202 and the strobe clock SCK in addition to the CO3, and becomes "1" when A=B. The N0
In addition to the CO3, R209 is connected to the output of the inverter 203 and the strobe clock SCK.
1”. A is a comparison input, from MSB to Aa, A
2, AI, and AO are shown. B is another comparison input I)
From MSB, B3°B2, B+, and Bo are shown. Also, the comparator circuit 200 is the same as the single-digit comparator circuit in FIG. In A=B, for example, A(A3.A2.AI,
AO) is (0°0.1.0), B(B3.B2.Bl,
BO) is (o, o, i, o), the transfer gate 107 of each digit is [ONJ, C1o=cOO=cil
=co1=Ci2=Co2=Ci3=C03. That is, in the first half of the clock CL, 11'' is captured by the latch 210 at the time when the clock CL becomes Co314rlJ and changes from 11'' to 10''. In the second half, the clock CL becomes "0", and the latch 210 becomes the clock CL.
The latch 210 holds Co3 "1" in the first half of
The inverter 202 that outputs a negative phase output becomes "0", and the inverter 203 that outputs a positive phase output becomes "1". N0R209
is connected to the positive phase output of the latch 210, so it becomes "0". Furthermore, Q==CiQ=(90-Cil=Co 1
=Ci2=Co2=Ci3=Co3,
The output of the inverter 206 is "1", so the N0R 207 is "0". N0R208 indicating A=B is C03="
O”, the negative phase output of the latch 210 is “0”, and becomes “1” at the timing of strobe clock 5CKI-Oj.
becomes. Therefore, the determination of A=H is shown.

比較数A、Bが異なる易合でも、第2図の真理値表によ
り作動し、A>B又はA(Hのどちらかがストローブク
ロックSCK [QJのタイミングに於いて、第4図に
示す如く動作する。
Even if the comparison numbers A and B are different, it operates according to the truth table in Figure 2, and either A>B or A(H is the strobe clock SCK [at the timing of QJ, as shown in Figure 4) Operate.

(発明の効果) 本発明の比較回路は、自桁より下位の桁上げ出力を桁上
げ入力に、桁上げ出力を上位桁の桁上げ入力に接続する
ことによって、任意桁の比較回路をレイアウトのレキー
ラリティを乱すことなく構成することができる。
(Effects of the Invention) The comparison circuit of the present invention connects the carry output of the lower digit to the carry input and the carry output to the carry input of the higher digit, so that the comparison circuit of any digit can be adjusted in the layout. It can be configured without disturbing requirality.

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

第1図は本発明による一桁の比較回路の一実施例の回路
図である。 A、B・・・・・・比較数、101,102・・・・・
・インバータ、100・・・・・・NAND、103,
104・・・・・・OR,105゜10.6,107・
・・・・・トランスファゲート、A、B・・・・・・比
較数、CO・・・・・・上位への桁上は出力、CI・・
・・・・下位からの桁上げ入力、200・・・・・・−
桁の比較回路、 第2図は第1図の真理値表を示す図である。 第3図は本発明の多桁比較回路の一実施例を示す回路図
である。 CL・・・・・・クロック、A3.A2.AI、AO,
B3.B2゜B1.Bo・・・・・・比較数、cto、
cil、ci2.cia・・・・・・各桁の桁上げ入力
、CoQ、Cot、Co2.Co3・・・・・・各桁の
桁上げ出力、200・・・・・・第1図の一桁の比較回
路、201.204・・・・・・トランスファゲート、
202,203゜205.206・・・・・・インバー
タ、207,208,209・・・・・・NOR,21
0・・・・・・ラッテ、SCK・・・・・・ストローブ
クロック、 第4図は第1図のタイミング図を示す。 第5図は従来の比較回路の回路図である。 A    B 歴 第1I!I(実、e例I) 第 2 図 z12 茅5図(jf一本例)
FIG. 1 is a circuit diagram of one embodiment of a single-digit comparator circuit according to the present invention. A, B... Number of comparisons, 101, 102...
・Inverter, 100...NAND, 103,
104...OR, 105°10.6, 107・
...Transfer gate, A, B...Comparison number, CO...Carry to higher order is output, CI...
...Carry input from lower order, 200...-
Digit Comparison Circuit, FIG. 2 is a diagram showing the truth table of FIG. 1. FIG. 3 is a circuit diagram showing an embodiment of the multi-digit comparator circuit of the present invention. CL...Clock, A3. A2. AI, AO,
B3. B2゜B1. Bo...Number of comparisons, cto,
cil, ci2. cia... Carry input for each digit, CoQ, Cot, Co2. Co3... Carry output for each digit, 200... Single digit comparison circuit in Figure 1, 201.204... Transfer gate,
202,203゜205.206...Inverter, 207,208,209...NOR, 21
0...Latte, SCK...Strobe clock, FIG. 4 shows the timing diagram of FIG. 1. FIG. 5 is a circuit diagram of a conventional comparison circuit. A B History 1st I! I (actual, e example I) 2nd figure z12 Kaya 5 figure (jf one example)

Claims (1)

【特許請求の範囲】[Claims] 比較する2進数の2つの入力に対して不一致を検出する
回路と、一致を検出する回路と、該2つの入力が一致し
ている場合は下位桁の状態を、不一致の場合は自桁の状
態を上位桁に出力すべく前記一致回路並びに不一致回路
に接続されたトランスファゲートとを有することを特徴
とする比較回路。
A circuit that detects a mismatch between two inputs of binary numbers to be compared, a circuit that detects a match, and a circuit that detects the state of the lower digit when the two inputs match, and the state of the own digit when they do not match. A comparison circuit comprising a transfer gate connected to the match circuit and the mismatch circuit to output the above to the higher order digits.
JP60053652A 1985-03-18 1985-03-18 Comparison circuit Granted JPS61211735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60053652A JPS61211735A (en) 1985-03-18 1985-03-18 Comparison circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60053652A JPS61211735A (en) 1985-03-18 1985-03-18 Comparison circuit

Publications (2)

Publication Number Publication Date
JPS61211735A true JPS61211735A (en) 1986-09-19
JPH051495B2 JPH051495B2 (en) 1993-01-08

Family

ID=12948802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60053652A Granted JPS61211735A (en) 1985-03-18 1985-03-18 Comparison circuit

Country Status (1)

Country Link
JP (1) JPS61211735A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01279317A (en) * 1987-05-01 1989-11-09 Rca Licensing Corp Multi-bit digital threshold comparator circuit
US4903005A (en) * 1987-11-04 1990-02-20 Mitsubishi Denki Kabushiki Kaisha Comparator circuit
JP2010277218A (en) * 2009-05-27 2010-12-09 Oki Semiconductor Co Ltd N-bit comparison circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5353236A (en) * 1976-10-22 1978-05-15 Siemens Ag Logical circuit by mos integrated circuit technology
JPS5563433A (en) * 1978-11-08 1980-05-13 Hitachi Ltd Comparator
JPS59105140A (en) * 1982-12-08 1984-06-18 Toshiba Corp Digital comparator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5353236A (en) * 1976-10-22 1978-05-15 Siemens Ag Logical circuit by mos integrated circuit technology
JPS5563433A (en) * 1978-11-08 1980-05-13 Hitachi Ltd Comparator
JPS59105140A (en) * 1982-12-08 1984-06-18 Toshiba Corp Digital comparator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01279317A (en) * 1987-05-01 1989-11-09 Rca Licensing Corp Multi-bit digital threshold comparator circuit
US4903005A (en) * 1987-11-04 1990-02-20 Mitsubishi Denki Kabushiki Kaisha Comparator circuit
JP2010277218A (en) * 2009-05-27 2010-12-09 Oki Semiconductor Co Ltd N-bit comparison circuit

Also Published As

Publication number Publication date
JPH051495B2 (en) 1993-01-08

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