JPH03102852A - Gate array - Google Patents

Gate array

Info

Publication number
JPH03102852A
JPH03102852A JP23971189A JP23971189A JPH03102852A JP H03102852 A JPH03102852 A JP H03102852A JP 23971189 A JP23971189 A JP 23971189A JP 23971189 A JP23971189 A JP 23971189A JP H03102852 A JPH03102852 A JP H03102852A
Authority
JP
Japan
Prior art keywords
input
logic circuit
gate array
output
rom
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.)
Pending
Application number
JP23971189A
Other languages
Japanese (ja)
Inventor
Shinichi Echigoya
越後谷 晋一
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 Engineering Ltd
Original Assignee
NEC Engineering Ltd
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 Engineering Ltd filed Critical NEC Engineering Ltd
Priority to JP23971189A priority Critical patent/JPH03102852A/en
Publication of JPH03102852A publication Critical patent/JPH03102852A/en
Pending legal-status Critical Current

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  • Design And Manufacture Of Integrated Circuits (AREA)

Abstract

PURPOSE:To enable a switching logic circuit to be programmed electrically and the program to be erased by ultra-violet rays by providing an operation mode logic circuit which is connected to an output pin and is equipped with a plurality of operation modes selected being based on a mode selection signal. CONSTITUTION:A plurality of I/O pins 16 are allowed to protrude from a case 7, and in the I/O pins 16 I/O signals 2, 6 are arbitrarily can be input and output. A gate array 1 has an operation mode logic circuit 5 which is connected to an output pin and is provided with a plurality of operation modes to be selected being based on a mode selection signal 4 and an EP-ROM 3 as a switching logic circuit which transmits mode selection signal being based on the input signal 2 from the input pin. This EP-ROM 3 is configured so that it can be programmed electrically and the program can be erased by ultra-violet rays. Namely, a window for irradiating ultra-violet rays 8 which enables ultra-violet rays which are irradiated for the EP-ROM 3 to be transmitted is provided on the upper surface of the DIP-type case 7.

Description

【発明の詳細な説明】 [産業上の利用分野コ 本発明は、複数の入出力ピンを持ち、自由に論理回路な
構戊できその論理回路の入出力信号を任意に入出力ピン
に接続てきる論理素子を持つ専用LSIとしてのゲート
アレイに関する。
[Detailed Description of the Invention] [Industrial Field of Application] The present invention has a plurality of input/output pins, can be freely configured into a logic circuit, and can connect the input/output signals of the logic circuit to any input/output pin. The present invention relates to a gate array as a dedicated LSI having logic elements.

[従来の技術] 一Mに、コンピュータシステム等の回路を設計するとき
、汎用のICを組み合せるのではなく、回路を組み込ん
だ専用LSI(以下「ゲートアレイ」という)を設計す
る手法がとられるようになって来ている。このゲートア
レイを設計するとき検討しなければならない項目として
、入出力信号ピンの最大数と、内部に組み込めるゲート
量とがあるが、一a的には、ピン数の制御により組み込
める回路量が決りゲートの半分近くが使えないことが多
い。これを解決するため、従来においては、入出力ピン
の機能を含め全く異なる複数の機能をゲートアレイに組
み込み、これらの機能の切り替えのため、特別な入力ピ
ンを定義するという方法がとられてきた。
[Prior art] When designing a circuit for a computer system, etc., a method is used to design a dedicated LSI (hereinafter referred to as a "gate array") incorporating the circuit, rather than combining general-purpose ICs. It's starting to look like this. Items that must be considered when designing this gate array include the maximum number of input/output signal pins and the amount of gates that can be incorporated internally, but the amount of circuitry that can be incorporated is determined by controlling the number of pins. Almost half of the gates are often unusable. To solve this problem, the conventional method was to incorporate multiple completely different functions, including input/output pin functions, into the gate array, and to define special input pins to switch between these functions. .

即ち、第3図に示すように、従来のゲートアレイ9は、
出力ピンに接続されて出力信号l5を送出しモードセレ
クト信号■3に基づいて選択される複数の動作モード(
MODEL〜MODEX)を備えた動作モード論理回路
14と、入力信号10が入力し機能切替信号11に基づ
いて上記モードセレクト信号13を送出する入力信号デ
コード回路12とを備えている。そして、上記機能切替
信号l1は特別に設けた入力ピンがら入力するようにな
っている。
That is, as shown in FIG. 3, the conventional gate array 9
A plurality of operation modes (
The operating mode logic circuit 14 includes an operation mode logic circuit 14 (MODEL to MODEX), and an input signal decoding circuit 12 to which an input signal 10 is input and which sends out the mode select signal 13 based on a function switching signal 11. The function switching signal l1 is inputted through a specially provided input pin.

[発明が解決しようとする課題] 然しなから、上述した従来のようなゲートアレイ9にあ
っては、 (1)動作モードの切替えに特別の入力ピンを使用する
ため、回路設計上で入力ピンが不足する虞があり、回路
設計の自由度が低下する。
[Problems to be Solved by the Invention] However, in the conventional gate array 9 described above, (1) Since a special input pin is used to switch the operation mode, the input pin is There is a risk that there will be a shortage, and the degree of freedom in circuit design will decrease.

(2)ゲー1〜アレイの設計後、任意に内部の動作モー
ド切替えの為の論理回路を変更する事か出来ない。
(2) After designing the game 1 to array, it is not possible to arbitrarily change the internal logic circuit for switching the operation mode.

という欠点があった。There was a drawback.

[課題を解決するための手段] このような問題点を解決するための本発明の手段は、複
数の入出力ピンを備え入出力信号を任意に設定された入
出力ピンに入出力できるゲートアレイにおいて、出力ピ
ンに接続されモードセレクト信号に基づいて選択される
複数の動作モードを備えた動作モード論理回路と、入力
ピンからの入力信号に基づいて上記モードセレクト信号
を送出する切替論理回路とを備え、該切替論理回路を電
気的プログラム可能かつ該プログラムを紫外線消去可能
にしたものである。
[Means for Solving the Problems] Means of the present invention for solving these problems is a gate array that has a plurality of input/output pins and can input/output input/output signals to arbitrarily set input/output pins. an operation mode logic circuit connected to an output pin and having a plurality of operation modes selected based on a mode select signal; and a switching logic circuit that sends out the mode select signal based on an input signal from an input pin. The switching logic circuit is electrically programmable and the program can be erased by ultraviolet light.

〔実施例] 以下、添付図面に基づいて本発明の実施例に係るゲート
アレイを説明する。
[Example] Hereinafter, a gate array according to an example of the present invention will be described based on the accompanying drawings.

第l図及び第2図に示すように、実施例に係るゲートア
レイ1は、直方体状のDIP(DualInline 
Package)型ケース7から複数の入出力ピンl6
を整列させて突出させてあり、入出力信号2.6を任意
に設定した入出力ピンl6に入出力できるようにしてあ
る。このゲートアレイ1は、第1図に示すように、出力
ピンに接続されモードセレクト信号4に基づいて選択さ
れる複数の動作モード(MODE 1 〜MODEX)
を備えた動作モード論理回#r5(演算回路)と、入力
ピンからの入力信号2に基づいて上記モードセレクト信
号を送出する切替論理回路としてのEP−ROM3とを
備えている。このEP−ROM3は、電気的プログラム
可能かつ該プログラムを紫外線消去可能に構成されてい
る。即ち、DIP型ケース7の上面には、EP−ROM
3に対して照射される紫外線を透過する紫外線照射用窓
8を設けてある。
As shown in FIGS. 1 and 2, the gate array 1 according to the embodiment is a rectangular parallelepiped-shaped DIP
Package) type case 7 to multiple input/output pins l6
are arranged and protruded so that input/output signals 2.6 can be input/output to an arbitrarily set input/output pin l6. As shown in FIG. 1, this gate array 1 has a plurality of operation modes (MODE 1 to MODEX) connected to an output pin and selected based on a mode select signal 4.
and an EP-ROM 3 as a switching logic circuit that sends out the mode select signal based on the input signal 2 from the input pin. This EP-ROM 3 is configured to be electrically programmable and erasable with ultraviolet light. That is, on the top surface of the DIP type case 7, there is an EP-ROM
An ultraviolet ray irradiation window 8 is provided that transmits the ultraviolet rays irradiated onto 3.

従って、この実施例に係るゲートアレイ1によれば、入
力信号2が、紫外線消去及び電気的プログラムが可能で
、動作モード切替えの為の論理回路を持つEP−ROM
3に入力すると、該EP−ROM3は、この入力信号に
より該E P − R OMa内で処理された各動作モ
ードのモードセレクト信号4を送出する。これにより、
動作モード論理回FIl!f5の動作モードが選択され
、各動作モードによって処理された出力信号6が出力さ
れる。
Therefore, according to the gate array 1 according to this embodiment, the input signal 2 is an EP-ROM that can be erased by ultraviolet rays, can be electrically programmed, and has a logic circuit for switching operation modes.
3, the EP-ROM 3 sends out a mode select signal 4 for each operating mode processed in the EP-ROM by this input signal. This results in
Operation mode logic cycle FIl! The operation mode f5 is selected, and the output signal 6 processed by each operation mode is output.

また、本実施例に係るゲートアレイ1においては、紫外
線照射用窓8から紫外線を照射すると、ゲートアレイ1
内のEP−ROM3部の回路情報が消される。これによ
り、EP−ROM3のデータの書き変えが可能になる。
Further, in the gate array 1 according to this embodiment, when ultraviolet rays are irradiated from the ultraviolet ray irradiation window 8, the gate array 1
The circuit information of the three parts of the EP-ROM inside is erased. This makes it possible to rewrite the data in the EP-ROM 3.

[発明の効果コ 以上説明したように本発明のゲートアレイによれば、ゲ
ートアレイの内部に設けられた切替論理回路のデータを
書き変える事ができるので、動作モードの切替えの為の
入力ピンを省略でき、回路設計上で入力ピンが不足して
しまう事態を抑制できる。また、ゲートアレイの設計後
に、動作モード切替えの為の論理回路を任意に設定てき
るという効果がある。
[Effects of the Invention] As explained above, according to the gate array of the present invention, the data of the switching logic circuit provided inside the gate array can be rewritten, so the input pin for switching the operation mode can be changed. This can be omitted, and it is possible to prevent a situation in which input pins are insufficient in circuit design. Further, after designing the gate array, the logic circuit for switching the operation mode can be arbitrarily set.

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

第1図は本発明の実施例に係るゲートアレイの内部回路
構戒を示すブロック図、第2図は本発明の実施例に係る
ゲートアレイをDIP型のケースて実現した時の外観図
、第3図は従来のゲー1−アレイの内部回路構成の一例
を示すブロック図である。 1:ゲートアレイ 2:入力信号 3 : EP−ROM 4:モードセレクト信号 5;動作モード論理回路 6:出力信号 7:DIP型ケース 8:紫外線照射用窓 9:ゲートアレイ 10:入力信号 11:機能切替信号 12:入力信号デコード回路 13:モードセレクト信号 14:動作モード論理回路 15:出力信号
FIG. 1 is a block diagram showing the internal circuit structure of a gate array according to an embodiment of the present invention, FIG. 2 is an external view when the gate array according to an embodiment of the present invention is realized as a DIP type case, and FIG. FIG. 3 is a block diagram showing an example of the internal circuit configuration of a conventional game array. 1: Gate array 2: Input signal 3: EP-ROM 4: Mode select signal 5; Operation mode logic circuit 6: Output signal 7: DIP type case 8: Ultraviolet irradiation window 9: Gate array 10: Input signal 11: Function Switching signal 12: Input signal decoding circuit 13: Mode select signal 14: Operation mode logic circuit 15: Output signal

Claims (1)

【特許請求の範囲】[Claims] 複数の入出力ピンを備え入出力信号を任意に設定された
入出力ピンに入出力できるゲートアレイにおいて、出力
ピンに接続されモードセレクト信号に基づいて選択され
る複数の動作モードを備えた動作モード論理回路と、入
力ピンからの入力信号に基づいて上記モードセレクト信
号を送出する切替論理回路とを備え、該切替論理回路を
電気的プログラム可能かつ該プログラムを紫外線消去可
能にしたことを特徴とするゲートアレイ。
In a gate array that has multiple input/output pins and can input/output input/output signals to arbitrarily set input/output pins, the operation mode has multiple operation modes connected to the output pin and selected based on the mode select signal. It is characterized by comprising a logic circuit and a switching logic circuit that sends out the mode selection signal based on an input signal from an input pin, and the switching logic circuit is electrically programmable and the program can be erased by ultraviolet light. gate array.
JP23971189A 1989-09-14 1989-09-14 Gate array Pending JPH03102852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23971189A JPH03102852A (en) 1989-09-14 1989-09-14 Gate array

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23971189A JPH03102852A (en) 1989-09-14 1989-09-14 Gate array

Publications (1)

Publication Number Publication Date
JPH03102852A true JPH03102852A (en) 1991-04-30

Family

ID=17048790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23971189A Pending JPH03102852A (en) 1989-09-14 1989-09-14 Gate array

Country Status (1)

Country Link
JP (1) JPH03102852A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485969A (en) * 1992-09-01 1996-01-23 Daiwa Seiko, Inc. Reverse rotation preventive mechanism for fishing reel
US5818768A (en) * 1995-12-19 1998-10-06 Mitsubishi Denki Kabushiki Kaisha Operation mode setting circuit in semiconductor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5485969A (en) * 1992-09-01 1996-01-23 Daiwa Seiko, Inc. Reverse rotation preventive mechanism for fishing reel
US5818768A (en) * 1995-12-19 1998-10-06 Mitsubishi Denki Kabushiki Kaisha Operation mode setting circuit in semiconductor device

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