JPS59124761A - Read-only memory - Google Patents

Read-only memory

Info

Publication number
JPS59124761A
JPS59124761A JP58000103A JP10383A JPS59124761A JP S59124761 A JPS59124761 A JP S59124761A JP 58000103 A JP58000103 A JP 58000103A JP 10383 A JP10383 A JP 10383A JP S59124761 A JPS59124761 A JP S59124761A
Authority
JP
Japan
Prior art keywords
layer
metal
line
layer metal
memory
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
JP58000103A
Other languages
Japanese (ja)
Other versions
JPH0348667B2 (en
Inventor
Nobuyuki Sugiyama
杉山 伸之
Yoshio Kachi
加地 善男
Yoshinari Kitamura
北村 嘉成
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
Nippon Electric Co 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 Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP58000103A priority Critical patent/JPS59124761A/en
Publication of JPS59124761A publication Critical patent/JPS59124761A/en
Publication of JPH0348667B2 publication Critical patent/JPH0348667B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B20/00Read-only memory [ROM] devices

Landscapes

  • Semiconductor Memories (AREA)
  • Read Only Memory (AREA)

Abstract

PURPOSE:To shorten a period up to the completion of manufacture on an IC from the determination of ROM data by rewriting the contents of ROM data in a second layer metal process. CONSTITUTION:The memory has N channel MOSFETs (A), (B) forming a memroy cell, source electrodes for said MOSFETs are connected to a GND diffusion wiring 1, gate electrodes are made of poly Si, and combine a word line 2a, and drain electrodes 3a and 3b are connected to first layer metals by contacts 4 among the drain electrodes and first layer metals, and further connected to second layer metals 17a, 17b by contacts (through-holes) 16a among first layer metals and second layer metals. Output lines 15a and 15b are made of second layer metals, the second layer metal 17a of the periphery of the through-hole 16a is connected to the output line 15a by second layer metal, and the metal 17b of the periphery of the through-hole 16b is not connected to the output line 15b. Currents flow through the MOSFET (A) on the selection of the word line 2a by connecting the drain electrode 3a for the MOSFET to the output line in the same manner as the memory cell (A).

Description

【発明の詳細な説明】 (1)発明の属する技術分野の説明 本発明は読み出し専用メモリにかかり、とくにMO8型
果績回路のマスク、プログラム方式の読み出し専用メモ
リ(マスクR(JM)に関する。
DETAILED DESCRIPTION OF THE INVENTION (1) Description of the technical field to which the invention pertains The present invention relates to a read-only memory, and particularly relates to a MO8 type result circuit mask and a program-based read-only memory (Mask R (JM)).

(2)従来技術の説明 よく知られているようにこの種の読み出し専用メモ+J
(ROM)においては、製造工程の1つの工程のマスク
のみ全変更することによ、り ROMデータの変更が出
来るが、ROMデータの変更全行なう工程が後の工程で
あるほどROMデータの決定から、ICの完成せでの期
間が短くなる。
(2) Description of the prior art As is well known, this type of read-only memo+J
(ROM), it is possible to change the ROM data by changing all the masks in one step of the manufacturing process, but the later the process in which all changes are made to the ROM data, the more difficult it is to determine the ROM data. , the time required to complete the IC is shortened.

従来の1層メタルの場合のマスクR,OM ’i図面を
参照して説明する。
Masks R and OM'i in the case of a conventional one-layer metal will be explained with reference to the drawings.

第1図全参照すると、AおよびBばROMセルとなるN
チャンネルMO8FETであり、1けGNDラインであ
り拡散層で配線されてお、す、AおよびBのソース電極
が接続されており、2aはワード線であV%多結晶シリ
コン(PolyJ Si)で配線され、AおよびBのゲート電極を兼ねてお
り、3aおよび3bはそれぞれA、Hのドレイン電極で
あ、す、1層目のメタルとのコンタクト4があり、セル
の出力が1層目のメタルで出ており、5a、sbは出力
ラインであり1層目のメタルで配線されており、この出
力ラインとROMセルのドレイン電極の間’kAの3a
のように、出力ラインとメタルを使って接続するか又は
Bの3bのように、出力ラインとドレイン電極とを1層
目のメタルで接続せずにおくかによってR,OMのデー
タを作っており、1層目のメタルのマスクのみの変更で
ROMデータの書き換えが出来る。
Referring to FIG. 1, A and B are ROM cells N.
It is a channel MO8FET, and the 1st GND line is wired with a diffusion layer, and the source electrodes of A and B are connected. 2a is a word line, which is wired with V% polycrystalline silicon (PolyJ Si). 3a and 3b are the drain electrodes of A and H, respectively.There is a contact 4 with the first layer metal, and the output of the cell is connected to the first layer metal. 5a and sb are the output lines, which are wired with the first layer of metal, and 3a of 'kA is connected between this output line and the drain electrode of the ROM cell.
Create R and OM data by connecting the output line and the drain electrode using metal, as shown in Figure 3b, or by leaving the output line and drain electrode unconnected with the first layer of metal, as in 3b of B. ROM data can be rewritten by changing only the first layer metal mask.

しかしながら、メタルが多層になった場合にR,0Mセ
ルを構成するMOSFETのドレイン電極と直接コンタ
クトのとれる1層目のメタルの工程の後にさらに2層目
のメタル等の工程が増える為に、従来の方式のままでは
、ROMデータの決定から、IC製造完了までの期間が
長くなるという欠点があった。
However, when metal is multi-layered, the process of forming the second layer of metal, etc., increases after the process of forming the first layer of metal, which makes direct contact with the drain electrode of the MOSFET that constitutes the R,0M cell. If the above method was used as it was, there was a drawback that it took a long time from the determination of ROM data to the completion of IC manufacturing.

(3)発明の詳細な説明 本発明の目的は、2層目のメタル工程でR,0Mデータ
の内容を書き換えることによ、す、R,0Mデータの決
定からICの製造完了までの期間が短い、MO8集積回
路の読み出し専用メそりを提供することにある。
(3) Detailed Description of the Invention The purpose of the present invention is to shorten the period from the determination of the R,0M data to the completion of IC manufacturing by rewriting the contents of the R,0M data in the second layer metal process. The object of the present invention is to provide a short, read-only memory of an MO8 integrated circuit.

(4)発明の構成 本発明は、ワード線とビット線の交わる位置ごと[MO
SFETを有するようなMO8集積回路の読み出し専用
メモリにおいて、前記ワード線がpolysiで構成さ
れ、前記ビット線が2層目のメタルで構成され、前記M
O8FET ’iミソ−スミを基準電位に接続し、ゲー
ト電極を前記ワード線に接続し、ドレイン電極を前記ビ
ット線から離れた2層目のメタル領域に1層目のメタル
を用いて接続し、前記ビット線と前記2層目のメタル領
域を2層目のメタルで接続することによシ第1の出力レ
ベルを得、前記ビット線と前記2層目のメタル領域の間
を接続しないでおくことにより、第2の出力レベルを得
ることを特徴とする読み出し専用メそりである。
(4) Structure of the Invention The present invention provides a method for each position where a word line and a bit line intersect.
In a read-only memory of an MO8 integrated circuit having an SFET, the word line is made of polySi, the bit line is made of a second layer of metal, and the M
Connect the O8FET 'i to a reference potential, connect the gate electrode to the word line, and connect the drain electrode to a second layer metal region apart from the bit line using a first layer metal, A first output level is obtained by connecting the bit line and the second layer metal region with a second layer metal, and the bit line and the second layer metal region are not connected. This is a read-only memory characterized in that a second output level is obtained by this.

(5)この発明の詳細な説明 次に本発明の実施例について図面を参照して説明する。(5) Detailed description of this invention Next, embodiments of the present invention will be described with reference to the drawings.

尚、第1図と同等の機能部分は同一符号で示しである。Note that functional parts equivalent to those in FIG. 1 are indicated by the same reference numerals.

第2図を参照すると本発明の第1の実施例はメモリセル
をなすNチャンネルMO8FET  A。
Referring to FIG. 2, a first embodiment of the present invention is an N-channel MO8FET A forming a memory cell.

B4もち、そのソース電極はGND拡散配線1に接続し
、ゲート電極はPo1ySiであり、ワード線2aを兼
ねており、ドレイン電極3aおよび3bはドレイン電極
と1層目のメタルとのコンタクト4により、1層目のメ
タルに接続され、さらに1層目のメタルと2層目のメタ
ルとのコンタクト(スルーホール)16aおよび16b
により2層目のメタル17a、 17bに接続しておシ
、出力ライン15aおよび15b  は2層目のメタル
であり、スルーホール16aの周辺の2層目のメタル1
7aは、2層目のメタルで出力ライン15aに接続され
、スルーホール16bの周 5− 辺のメタル17bは出力ライン15b と接続していな
い。
The source electrode is connected to the GND diffusion wiring 1, the gate electrode is made of PolySi and also serves as the word line 2a, and the drain electrodes 3a and 3b are connected by the contact 4 between the drain electrode and the first layer metal. Contacts (through holes) 16a and 16b connected to the first layer metal and further between the first layer metal and the second layer metal
The output lines 15a and 15b are connected to the second layer metal 17a and 17b, and the output lines 15a and 15b are connected to the second layer metal 1 around the through hole 16a.
7a is the second layer of metal and is connected to the output line 15a, and the metal 17b around the through hole 16b is not connected to the output line 15b.

メモリセルAのようにMOSFETのドレイン電極3a
を出力ラインに接続することにより。
As in memory cell A, the drain electrode 3a of the MOSFET
by connecting it to the output line.

ワード線2aが選択された時にM08FE’r A’i
電流が流れ、出力ライン15aのレベルが下げられる。
M08FE'r A'i when word line 2a is selected
Current flows and the level of output line 15a is lowered.

一方MO8FET Bのようにドレイン電極3bが出力
ライン15bと接続されていない場合には、ワード線2
aが選択された時でも出力ラインは下がらない。
On the other hand, when the drain electrode 3b is not connected to the output line 15b as in MO8FET B, the word line 2
Even when a is selected, the output line does not fall.

このようにスルーホールと出力ラインを2層目のメタル
で接続することによりbllOWの出力レベルを得、ス
ルーホール全量カラインと接続せずにおくことにより、
Highの出力レベルが得られる。
In this way, by connecting the through hole and the output line with the second layer metal, the output level of bllOW is obtained, and by leaving all the through holes unconnected to the color line,
A high output level is obtained.

このようなROMセルの構造にすることによ、す、2層
目のメタルの工程で、ROMデータの書き換えが出来、
ROMデータの決定からICの製造完了までのターンア
ラウンドタイムを短くすることが出来る。
By using this kind of ROM cell structure, ROM data can be rewritten in the second layer metal process.
The turnaround time from the determination of ROM data to the completion of IC manufacturing can be shortened.

 6− 第3図全参照すると本発明の第2の実施例は第2図のワ
ード線2a、2bと平行に一層目のメタk 22a、 
22b  k走らせ、メモリセルの数ビツト毎にコンタ
クト21aおよび21bにより、それぞれ2aと21a
および2bと21b ’(c−接続している。こうする
ことにより、ROMの規模が大きくなると問題になるワ
ード線の抵抗による遅延が少さくなる。
6- With full reference to FIG. 3, a second embodiment of the present invention includes a first layer of metal k 22a, parallel to the word lines 2a, 2b of FIG.
22b k and contacts 21a and 21b for every few bits of the memory cell to connect 2a and 21a, respectively.
and 2b and 21b' (c-connected. By doing so, the delay due to word line resistance, which becomes a problem when the scale of the ROM becomes large, is reduced.

次に第4図を参照すると、本発明の第3の実施例は、前
記第1の実施例におけるGND拡散配線1上に、1層目
のメタルを用いてさらにGND配線31をし各セル毎に
GND拡散1とのコンタクト32をとるものであり、G
ND配線を拡散層のみで行なった場合に比べて、抵抗が
小さくでき、GNDレベルの浮き上がり’r抑えること
ができる。
Next, referring to FIG. 4, in the third embodiment of the present invention, a GND wiring 31 is further provided on the GND diffusion wiring 1 in the first embodiment using a first layer of metal, and a GND wiring 31 is provided for each cell. A contact 32 is made with the GND diffusion 1 at the GND diffusion 1.
Compared to the case where the ND wiring is formed using only a diffusion layer, the resistance can be made smaller and the rise of the GND level can be suppressed.

また、第4図では、ワード線2aおよび2bはpo I
 yS i  のみで配線されているが、図3の228
.22b  のように、1層目のメタルをワード線と平
行に走らせ、数ビット毎にpolys+と1層目のメタ
ルのコンタクトをとり、ワード線の抵抗を小さくしても
よい。
In addition, in FIG. 4, word lines 2a and 2b are po I
Although it is wired only by yS i, 228 in Fig. 3
.. 22b, the resistance of the word line may be reduced by running the first layer of metal parallel to the word line and making contact between polys+ and the first layer of metal every few bits.

(6)発明の詳細な説明 本発明は以上説明したように、ROMデータの書き換え
を2層目のメタルで行なうことによジROMデータの決
定からICの製造が完了するまでの期間を短かくするこ
とができる。
(6) Detailed Description of the Invention As explained above, the present invention shortens the period from determination of ROM data to completion of IC manufacturing by rewriting ROM data in the second layer of metal. can do.

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

第1図は、従来のメタル1層の場合のROMセルのレイ
アウト例を示す図である。第2図は本発明の第1の実施
例を示したレイアウト図、第3図は本発明の¥2の実施
例を示したレイアウト図。 第4図は本発明の第4の実施例を示したレイアウト図で
ある。 A、 B・・・・・・ROMセルとなるNチャンネルM
O8FET、 1・・・・・・GND拡散層配線、2a
、2b・・・・・・Po I yS rワード線、3 
a、3 b−川−ROMセルのドレイン電極、4・・・
・・拡散層と1層目のメタルとのコンタクト、5a、5
b・・・・・1層目のメタルの出力ライン、15a、1
5b・・・・・・2層目のメタルの出力ラインk  1
6a* 16b・・・・・・1層目のメタルと2層目ツ
メタルを接続するスルーホールS  17a、17b・
・・・・・スルーホール周辺の2層目のメタル、22a
。 22b  ・・・・・・1層目のメタルのワード線% 
21a、21b・・・・・・1層目のメタルとpoly
s+のコンタクト、31・・・・・・1層目のメタルの
GND配線、32・・・・・1層目のメタルと拡散層の
コンタクト。  9− 朶1区 第4図 −280=
FIG. 1 is a diagram showing an example of the layout of a ROM cell in the case of a conventional single metal layer. FIG. 2 is a layout diagram showing a first embodiment of the present invention, and FIG. 3 is a layout diagram showing a ¥2 embodiment of the present invention. FIG. 4 is a layout diagram showing a fourth embodiment of the present invention. A, B...N channel M that becomes a ROM cell
O8FET, 1...GND diffusion layer wiring, 2a
, 2b...Po I yS r word line, 3
a, 3 b - river - drain electrode of the ROM cell, 4...
...Contact between diffusion layer and first layer metal, 5a, 5
b...First layer metal output line, 15a, 1
5b...2nd layer metal output line k1
6a* 16b...Through hole S connecting the first layer metal and the second layer metal 17a, 17b・
...2nd layer metal around the through hole, 22a
. 22b...First layer metal word line%
21a, 21b...1st layer metal and poly
s+ contact, 31... GND wiring of first layer metal, 32... Contact between first layer metal and diffusion layer. 9- Ward 1 Figure 4-280=

Claims (1)

【特許請求の範囲】[Claims] ワード線とビット線の交わる位置ごとにMOSFETを
有するシリコンゲー)MO8渠槓回路の読み出し専用メ
モリにおいて、前記ビット線が2層目のメタルで構成さ
れ、前記ワード線がシリコンで構成され、前記MO8F
ETのソース電極を基準電位ラインに接伏し、前ヨ己M
O8FETのゲート電極全ワード線に接続し、前記MO
8FETのドレイン電極と前記ビット線から離れた位置
にある2層目のメタル領域全1層目のメタルで接続し、
前記ビット線と前記21目のメタル領域を2層目のメタ
ルで接続することにより、第1の出力レベルを得、前記
ビット線と前記2層目のメタル領域を接続しないでおく
ことにより、第2の出力レベルを得ることkW黴とする
読み出し専用メモリ。
In a read-only memory of an MO8 channel circuit (silicon game) having a MOSFET at each intersection of a word line and a bit line, the bit line is made of a second layer of metal, the word line is made of silicon, and the MO8F
Connect the source electrode of the ET to the reference potential line, and
The gate electrode of O8FET is connected to all word lines, and the MO
The drain electrode of the 8FET and the second layer metal region located away from the bit line are all connected by the first layer metal,
A first output level is obtained by connecting the bit line and the 21st metal region with a second metal layer, and a first output level is obtained by leaving the bit line and the second metal region unconnected. A read-only memory with an output level of 2 kW.
JP58000103A 1983-01-04 1983-01-04 Read-only memory Granted JPS59124761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58000103A JPS59124761A (en) 1983-01-04 1983-01-04 Read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58000103A JPS59124761A (en) 1983-01-04 1983-01-04 Read-only memory

Publications (2)

Publication Number Publication Date
JPS59124761A true JPS59124761A (en) 1984-07-18
JPH0348667B2 JPH0348667B2 (en) 1991-07-25

Family

ID=11464755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58000103A Granted JPS59124761A (en) 1983-01-04 1983-01-04 Read-only memory

Country Status (1)

Country Link
JP (1) JPS59124761A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7925408B2 (en) 2006-09-15 2011-04-12 Toyota Jidosha Kabushiki Kaisha Electric parking brake system and method for controlling the electric parking brake system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56147472A (en) * 1980-04-18 1981-11-16 Nec Corp Read only semiconductor memory
JPS57109365A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Semiconductor ic device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56147472A (en) * 1980-04-18 1981-11-16 Nec Corp Read only semiconductor memory
JPS57109365A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Semiconductor ic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7925408B2 (en) 2006-09-15 2011-04-12 Toyota Jidosha Kabushiki Kaisha Electric parking brake system and method for controlling the electric parking brake system

Also Published As

Publication number Publication date
JPH0348667B2 (en) 1991-07-25

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