JPS618354U - Direct memory access device - Google Patents

Direct memory access device

Info

Publication number
JPS618354U
JPS618354U JP9151184U JP9151184U JPS618354U JP S618354 U JPS618354 U JP S618354U JP 9151184 U JP9151184 U JP 9151184U JP 9151184 U JP9151184 U JP 9151184U JP S618354 U JPS618354 U JP S618354U
Authority
JP
Japan
Prior art keywords
dma
memory access
direct memory
address bus
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.)
Pending
Application number
JP9151184U
Other languages
Japanese (ja)
Inventor
哲雄 星野
Original Assignee
日本電気株式会社
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 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP9151184U priority Critical patent/JPS618354U/en
Publication of JPS618354U publication Critical patent/JPS618354U/en
Pending legal-status Critical Current

Links

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図は本考案の一実施例を含むブロック図、第２図は
従来のダイレクトメモリアクセス装置を含むブ請ンク図
である。 図において、１・・・マイクロコンピュータ、２・・・
メモＩＪ（一般′用）、３・・・ＤＭＡ制御器、４，４
１，４２−・ＤＭＡメモリ、５・・・入出力装置、６・
・・アドレスバス、７・・・データパス、訃・・切替器
である。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional direct memory access device. In the figure, 1... microcomputer, 2...
Memo IJ (for general use), 3...DMA controller, 4, 4
1,42--DMA memory, 5--input/output device, 6-
...address bus, 7...data path, and...switching device.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] マイクロコンピュータからの指示によるダイレクトメモ
リアクセス（ＤＭＡ）に用いられる二系統のＤＭＡ用メ
モリと、前記マイクロコンピュータとアドレスバスおよ
びデータパスを介して接続されると共に入出力装置と直
接接続されかつこめマイクロコンピュータのＤＭＡ指令
に従って制御信号を出力するＤＭＡ制御手段と、前記制
御信号によって前ｐＭＡ用メモリの接続系統を切替える
切替手段とを備え、この切替手蒔は、一方のＤＭＡ用メ
モリが前記アドレスバスおよびデータパスとそれぞれ接
続きれている時、他方のＤＭＡ用メモリがそのアドレス
バスとの接続系統を前記ＤＭＡ制御手段と接続されかつ
そのデータパスとの接続系統を前記入出力装置と接続さ
れるように交互に切替えられることｉ特徴とするダイレ
クトメモリアクセス装置。Two systems of DMA memory used for direct memory access (DMA) based on instructions from the microcomputer; and a microcomputer connected to the microcomputer via an address bus and a data path, and directly connected to an input/output device. DMA control means for outputting a control signal in accordance with the DMA command, and switching means for switching the connection system of the previous pMA memory according to the control signal, and this switching means that one DMA memory is connected to the address bus and the data When each path is disconnected, the other DMA memory alternately connects its address bus to the DMA control means and its data path to the input/output device. A direct memory access device characterized in that it can be switched to
JP9151184U 1984-06-19 1984-06-19 Direct memory access device Pending JPS618354U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9151184U JPS618354U (en) 1984-06-19 1984-06-19 Direct memory access device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9151184U JPS618354U (en) 1984-06-19 1984-06-19 Direct memory access device

Publications (1)

Publication Number Publication Date
JPS618354U true JPS618354U (en) 1986-01-18

Family

ID=30647465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9151184U Pending JPS618354U (en) 1984-06-19 1984-06-19 Direct memory access device

Country Status (1)

Country Link
JP (1) JPS618354U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62207944A (en) * 1986-03-10 1987-09-12 Agency Of Ind Science & Technol Thermal conductivity measuring instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62207944A (en) * 1986-03-10 1987-09-12 Agency Of Ind Science & Technol Thermal conductivity measuring instrument

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