JPS5924328A - Interruption controlling system - Google Patents

Interruption controlling system

Info

Publication number
JPS5924328A
JPS5924328A JP13219082A JP13219082A JPS5924328A JP S5924328 A JPS5924328 A JP S5924328A JP 13219082 A JP13219082 A JP 13219082A JP 13219082 A JP13219082 A JP 13219082A JP S5924328 A JPS5924328 A JP S5924328A
Authority
JP
Japan
Prior art keywords
interrupt
interruption
signal
request signal
ilo
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
JP13219082A
Other languages
Japanese (ja)
Inventor
Hideyuki Takahashi
秀幸 高橋
Shunichi Morisawa
俊一 森沢
Tsutomu Shimomura
勉 下村
Hirotsune Akamatsu
赤松 宏恒
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
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13219082A priority Critical patent/JPS5924328A/en
Publication of JPS5924328A publication Critical patent/JPS5924328A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14Handling requests for interconnection or transfer
    • G06F13/20Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/24Handling requests for interconnection or transfer for access to input/output bus using interrupt
    • G06F13/26Handling requests for interconnection or transfer for access to input/output bus using interrupt with priority control

Abstract

PURPOSE:To perform a correct interruption with a daisy chain connection, by delivering an answer signal in response to an interruption request signal and then performing an interruption after a fixed time in response to a prescribed state of an interruption vector signal line of that time point. CONSTITUTION:It is assumed that an I/O23 of three I/O devices delivers an interruption request signal, for instance. A CPU1 receives the transferred request signal and delivers the interruption answer signals to I/O21 and I/O22 via interruption answer signal lines 50 and 51 if the interruption can be accepted. In this case, the I/O22 is equal to the termination of a daisy chain and therefore has no actuation even though it receives the interruption answer signal. The CPU1 fetches the state of an interruption vector signal line 4 synchronously with the interruption answer signal. However, the CPU1 fetches the state of the line 4 from which no interruption vector is delivered when the I/O23 delivers an interruption request signal.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は割シ込み制御方式の改良に関するものであυ、
更に詳しくはディジーチェイン方式を用いた割り込み制
御方式の改良に関するものである。
[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in an interrupt control method.
More specifically, the present invention relates to an improvement of an interrupt control method using a daisy chain method.

〔発明の技術的背景〕[Technical background of the invention]

一般に、ディジーチェイン方式を用いた割り込み制御回
路は、第1図に示すような構成である。
Generally, an interrupt control circuit using the daisy chain method has a configuration as shown in FIG.

すなわち、CPUIとn個のl10(l1021゜l1
022、・・・、l102n)とから成り、CPU1は
、各I10に対し、共通の割り込み要求信号i堰3およ
び゛ルl]り込みペクタ信号線4を介して接続され、又
、CI−’ U 1は、l102.と割り込み応答信号
線5・を介して接続され、l102rとI / O2r
++(r:nより小さい自然数ンとは割シ込み応答信号
線5rを介して接続されている。
That is, CPUI and n l10 (l1021゜l1
022, . U 1 is l102. and is connected via interrupt response signal line 5, l102r and I/O2r
++(r: A natural number smaller than n is connected to the interrupt response signal line 5r.

このような回路において、ディジーチェイン上最終段の
l102nから割シ込み要求信号が発生した場合、まず
、CPU1は、この割り込み要求信号に対する割り込み
応答信号を出力する。この割h込み応答信号は、各I1
0において次々と次段に割シ込み応答信号線5rを介し
て伝達されてI/′02nに供給される。そして、この
割り込み応答信号を供給されたl102nは、割り込み
ベクタ信号#!4を介して割〕込みペクタをCPUIに
出力する。CPU1tjこの割シ込みペクタに基づいて
割シ込み処理を行なう。
In such a circuit, when an interrupt request signal is generated from l102n at the final stage in the daisy chain, the CPU 1 first outputs an interrupt response signal in response to the interrupt request signal. This interrupt response signal is for each I1
0, it is transmitted one after another to the next stage via the interrupt response signal line 5r and supplied to I/'02n. The l102n supplied with this interrupt response signal then sends the interrupt vector signal #! 4 to output the interrupt vector to the CPUI. The CPU 1tj performs interrupt processing based on this interrupt vector.

〔背景技術の問題点〕[Problems with background technology]

しかし、上記のような割シ込み方式においては、ディジ
ーチェイン上最終段のl102nの前に接続されるIl
oの数が多い場合、又はCPUIからl102nまでの
距離が長い場合、割シ込み応答信号の転送時にスキニー
や遅れなどが生じる。従って、このような場合、l10
2nから出力される割シ込みペクタは正しくCPUIに
転送されないという欠点があった。
However, in the above interrupt method, the Il connected before the final stage l102n on the daisy chain
If there are a large number of o's or if the distance from the CPUI to the l102n is long, skinny or delay may occur during the transfer of the interrupt response signal. Therefore, in such a case, l10
There was a drawback that the interrupt vector output from the 2n was not correctly transferred to the CPUI.

〔発明の目的〕 本発明は上記欠点に鑑みなされたもので、その目的は、
CPUに対しディジーチェイン方式で接続された複数台
のIloのうち、最終段のIloが割シ込み要求信号を
出力した場合、この最終段のIloは割り込みペクタを
出力しなくても正しい割シ込みが行なわれるようにする
ことである。
[Object of the invention] The present invention has been made in view of the above-mentioned drawbacks, and its object is to:
If the final Ilo among multiple Ilo's connected to the CPU in a daisy chain manner outputs an interrupt request signal, the final Ilo will issue a correct interrupt even if it does not output an interrupt vector. The goal is to ensure that this is carried out.

〔発明の概要〕[Summary of the invention]

電光r!Att、CPUと、?ニー (1:) CP 
UK対し、7’(ジ−チェイン方式によシ接続された(
n−1)台のIloと、CPUに対し、前記(n−1)
台のIloのうち最終段のIloよりもディジーチェモ
ノ上離れた位置に、割り込み要求信号線のみを介して接
続され、割カ込み要求信号のみを出力するようにされた
第n番目のIloとから成り、各I10から出力される
割シ込みペクタが無いときは、割り込みベクタ信号線の
状態を所定の状態となるように構成し、第n番目のIl
oから割り込み要求信号が出力された場合、CPUは、
この割り込み要求信号に応じて割り込み応答信号を出力
(7、一定時間の後、このときの割り込みペクタ信号線
における所定の状態に応じて割り込みを行なうようにし
て上記目的を達成した。
Lightning r! Att, CPU and? Knee (1:) CP
For UK, 7' (connected by G-chain system)
For the (n-1) Ilo and CPU, the (n-1)
The n-th Ilo is connected to a position further away from the final stage Ilo on the digital processor via only the interrupt request signal line, and outputs only the interrupt request signal. When there is no interrupt vector output from each I10, the state of the interrupt vector signal line is configured to be a predetermined state, and the n-th Il
When an interrupt request signal is output from o, the CPU:
The above object was achieved by outputting an interrupt response signal in response to the interrupt request signal (7).After a certain period of time, an interrupt is performed in accordance with a predetermined state of the interrupt vector signal line at that time.

r発明の実施例〕 以下図面を参照して本発明の一実施例を説明する。Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

第2図は、本実施例を説明する為のブロック図である。FIG. 2 is a block diagram for explaining this embodiment.

図中、第1図に示した各部と同じものは同番号を付しで
ある。ただし、本実施例では、■10を3台とし、ディ
ジーチェイン上最終段となるl102.は、割り込み要
求信号線3を介してのみCPU1と接続され、割り込み
ペクタ信号線4は8本のデータラインから構成されてい
るものとする。又、この割シ込みペクタ信号線4はプル
アップ抵抗6を介して電源V。。と接続されているも・
  のとする。
In the figure, the same parts as those shown in FIG. 1 are given the same numbers. However, in this embodiment, there are three units of ■10, and the final stage of the daisy chain is l102. is connected to the CPU 1 only via the interrupt request signal line 3, and the interrupt vector signal line 4 is composed of eight data lines. Further, this interrupt vector signal line 4 is connected to the power supply V via a pull-up resistor 6. . Although it is connected to
To be.

このように構成された回路において、I / O21が
割り込み要求信号を出力した場合を説明する。
A case will be described in which the I/O 21 outputs an interrupt request signal in the circuit configured as described above.

まず、CPUIは、l102.から転送された割シ込み
要求信号を受は取ると、割シ込み受は付は可能であれば
割り込み応答信号を割り込み応答信号線50を介してl
102.に出力する。 l102.は、割り込み要求信
号を出力していないので、割シ込み応答信号を割り込み
応答信号線51を介して次段のl102.に出力する。
First, the CPUI is l102. When the interrupt receiver receives the interrupt request signal transferred from
102. Output to. l102. Since it does not output an interrupt request signal, the interrupt response signal is sent to the next stage l102. through the interrupt response signal line 51. Output to.

同じく割り込み要求信号を出力していないI / O2
mは゛ディジーチェインの終端にあるため、この信号を
受けても何の動作も行なわない。
I/O2 that also does not output an interrupt request signal
Since m is at the end of the daisy chain, it does nothing even if it receives this signal.

一方、CPU1は、前述した割り込み応答信号を出力す
ると、これと同期して、割り込みペクタ信号線4の状態
を取り込む。第3図に割り込み要求信号線3、割り込み
応答GT号綜50.割シ込みペクタ信号線4の各線上に
おける信号のタイミングを示す。l102.が割シ込み
要求信号を発している場合、CPU1は何ら割り込みペ
クタが出力され王いない割り込みペクタ信号#A4の状
態を取り込むことになる。このとき、シーJり込みペク
タ信号線4はプルアップ抵抗6を介して一定電圧VCC
に引き上けられている。従って、割り込みペクタ信号線
4における信号が正極性(11”アクティブ)に定腺さ
れていれば、CPUIは(FF)tsの値を読み取るこ
とになる。この割り込みペクタ(FF)+6をl102
3から出力された割υ込みペクタであると予め定餞して
おけば、l102.は割シ込みペクタを出力しなくとも
CPUIに対して正しく割り込みペクタを伝えることに
なる。
On the other hand, when the CPU 1 outputs the above-mentioned interrupt response signal, it takes in the state of the interrupt vector signal line 4 in synchronization with this. FIG. 3 shows an interrupt request signal line 3, an interrupt response GT line 50. The timing of signals on each line of the interrupt vector signal line 4 is shown. l102. is issuing an interrupt request signal, the CPU 1 takes in the state of the interrupt vector signal #A4 for which no interrupt vector is output. At this time, the signal line 4 is connected to a constant voltage VCC through the pull-up resistor 6.
It has been raised to Therefore, if the signal on the interrupt vector signal line 4 is set to positive polarity (11" active), the CPU will read the value of (FF)ts.
If it is determined in advance that it is the interrupt vector output from l102. will correctly convey the interrupt vector to the CPUI without outputting the interrupt vector.

なお、l1021又はl102.から割り込み要求が生
じたときは、従来のディジーチェイン方式により割り込
み処理が行なわれる。
In addition, l1021 or l102. When an interrupt request is generated, the interrupt processing is performed using the conventional daisy chain method.

以上は、割り込みペクタ信号線における信号が正極性(
1”アクティブ)の場合についての説明である。しかし
、’JJUF)込みペクタ信号線における信号が負極性
(“0”アクティブ)の場合であっても、CPUに読み
取られるペクタの値が(00)1・に変わるだけであり
、同様の効果が得られる。
In the above, the signal on the interrupt vector signal line has positive polarity (
This is an explanation for the case where the pecta signal line including 'JJUF) is of negative polarity ("0" active), but the pecta value read by the CPU is (00). 1. The same effect can be obtained.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、CPUに対しデ
ィジーチェイン方式で接続された複数台のIloのうち
、最終段のIloから割り込み要求信号が出力された場
合、これに対する割り込み応答信号の転送時に生じるス
キ具−や遅れに影響されることなく、正しい割り込みベ
クトルに基づいて割り込み処理が行なわれる。
As explained above, according to the present invention, when an interrupt request signal is output from the final stage Ilo among a plurality of Ilo connected to the CPU in a daisy chain manner, an interrupt response signal is transferred in response to the interrupt request signal. Interrupt processing is performed based on the correct interrupt vector without being affected by errors or delays that may occur.

又、本発明によれば、上記最終段のIloにおいて、割
シ込みベーク1り・出力回路が不要となる。
Further, according to the present invention, an interrupt bake 1/output circuit is not required in the final stage Ilo.

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

第1図はディジーチェイン方式を用いた従来のfs’J
シ込み方式を説明する為のブロック図、第2図は本発明
方式を説明する為のブロック図、第3図は、割り込み要
求信号線、割り込み応答信号線、割り込みペクタ信号線
夫々の信号線上における信号のタイミングを示すタイミ
ングチャートである。 1 ・・・CP U  21.2m、2m ”・I /
 O3・・・割や込み要求信号線 4・・・割り込みベクタ信号線 5o、 51・・・割り込み応答信号線6・・・プルア
ップ抵抗 代理人 弁理士  則  近  憲  佑(ほか1名)
Figure 1 shows the conventional fs'J using the daisy chain method.
FIG. 2 is a block diagram for explaining the method of the present invention. FIG. 3 is a block diagram for explaining the interrupt method, and FIG. 5 is a timing chart showing signal timing. 1...CPU 21.2m, 2m"・I/
O3...Interrupt request signal line 4...Interrupt vector signal line 5o, 51...Interrupt response signal line 6...Pull-up resistor agent Patent attorney Noriyuki Chika (and 1 other person)

Claims (1)

【特許請求の範囲】[Claims] CPUと、このCPUに対し、ディジーチェイン方式に
より接続された(n−1)台のIloと、前記CPUK
対し、前記(n−1)台のIloのうち最終段のIlo
よりもディジーチェモノ上離れた位置に、割り込み要求
信号線のみを介して接続され、割り込み要求信号のみを
出力するようにされた第n番目のIloとから成り、前
記(n−1)台のIloから割り込み4クタ出力が無い
ときは、割り込みペクタ信号線の状態を所定の状態とな
るように構成し、前記第n番目のIloから割り込み要
求信号が出力された場合、前記CPUは、この割り込み
要求信号に応じて割り込み応答信号を出力し、一定時間
の後、このときの前記割り込みペクタ信号線における前
記所定の状態に基づいて割り込み処理を行なうことを特
徴とする割り込み制御方式。
A CPU, (n-1) Ilo's connected to this CPU by a daisy chain method, and the CPUK
On the other hand, among the (n-1) Ilo's, the final stage Ilo
The n-th Ilo is connected only via an interrupt request signal line to a position further away from the processor, and outputs only an interrupt request signal. When there is no interrupt 4 vector output from Ilo, the state of the interrupt vector signal line is configured to be a predetermined state, and when an interrupt request signal is output from the n-th Ilo, the CPU handles this interrupt. An interrupt control method characterized in that an interrupt response signal is output in response to a request signal, and after a certain period of time, interrupt processing is performed based on the predetermined state of the interrupt vector signal line at this time.
JP13219082A 1982-07-30 1982-07-30 Interruption controlling system Pending JPS5924328A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13219082A JPS5924328A (en) 1982-07-30 1982-07-30 Interruption controlling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13219082A JPS5924328A (en) 1982-07-30 1982-07-30 Interruption controlling system

Publications (1)

Publication Number Publication Date
JPS5924328A true JPS5924328A (en) 1984-02-08

Family

ID=15075499

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13219082A Pending JPS5924328A (en) 1982-07-30 1982-07-30 Interruption controlling system

Country Status (1)

Country Link
JP (1) JPS5924328A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184541A (en) * 1986-02-10 1987-08-12 Hitachi Ltd Interruption processing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184541A (en) * 1986-02-10 1987-08-12 Hitachi Ltd Interruption processing circuit

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