JPH0184154U - - Google Patents
Info
- Publication number
- JPH0184154U JPH0184154U JP1987177324U JP17732487U JPH0184154U JP H0184154 U JPH0184154 U JP H0184154U JP 1987177324 U JP1987177324 U JP 1987177324U JP 17732487 U JP17732487 U JP 17732487U JP H0184154 U JPH0184154 U JP H0184154U
- Authority
- JP
- Japan
- Prior art keywords
- memory access
- direct memory
- microprocessor
- control device
- access controller
- 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
Links
- 238000010586 diagram Methods 0.000 description 2
- MHABMANUFPZXEB-UHFFFAOYSA-N O-demethyl-aloesaponarin I Natural products O=C1C2=CC=CC(O)=C2C(=O)C2=C1C=C(O)C(C(O)=O)=C2C MHABMANUFPZXEB-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Bus Control (AREA)
Description
第１図は本考案を実施したダイレクト・メモリ
・アクセス制御装置の構成を表わすブロツク図、
第２図は本考案装置の動作を示すフローチヤート
、第３図は従来のダイレクト・メモリ・アクセス
制御装置の構成を表わすブロツク図である。
１……マイクロプロセツサμＰ、２……ダイレ
クト・メモリ・アクセス・コントローラＤＭＡＣ
、３……メモリ、４……入出力部、５，６……拡
張レジスタ、７……演算器、８……初期値バツフ
ア、９……制御回路。
FIG. 1 is a block diagram showing the configuration of a direct memory access control device implementing the present invention.
FIG. 2 is a flowchart showing the operation of the device of the present invention, and FIG. 3 is a block diagram showing the configuration of a conventional direct memory access control device. 1... Microprocessor μP, 2... Direct memory access controller DMAC
, 3... Memory, 4... Input/output unit, 5, 6... Extension register, 7... Arithmetic unit, 8... Initial value buffer, 9... Control circuit.
Claims (1)
サから発生するアドレスによりダイレクト・メモ
リ・アクセスを行うダイレクト・メモリ・アクセ
ス・コントローラと、前記ダイレクト・メモリ・
アクセス・コントローラが扱うアドレス・ビツト
数を前記マイクロプロセツサから発生するアドレ
ス・ビツト数に合わせる拡張レジスタとを有する
ダイレクト・メモリ・アクセス制御装置において
、 前記マイクロプロセツサから発生するダイレク
ト・メモリ・アクセスに関連するアドレスが所定
値以上になつた場合に前記拡張レジスタ内の値を
インクリメントする演算器を設けたことを特徴と
するダイレクト・メモリ・アクセス制御装置。[Claims for Utility Model Registration] A microprocessor, a direct memory access controller that performs direct memory access using addresses generated by the microprocessor, and a direct memory access controller that performs direct memory access using addresses generated from the microprocessor;
A direct memory access control device having an extension register that adjusts the number of address bits handled by the access controller to the number of address bits generated from the microprocessor, A direct memory access control device comprising: an arithmetic unit that increments a value in the extension register when a related address exceeds a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987177324U JPH0537312Y2 (en) | 1987-11-20 | 1987-11-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987177324U JPH0537312Y2 (en) | 1987-11-20 | 1987-11-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0184154U true JPH0184154U (en) | 1989-06-05 |
| JPH0537312Y2 JPH0537312Y2 (en) | 1993-09-21 |
Family
ID=31468992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987177324U Expired - Lifetime JPH0537312Y2 (en) | 1987-11-20 | 1987-11-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537312Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56157520A (en) * | 1980-05-06 | 1981-12-04 | Fujitsu Ltd | Dma system without cycle steal |
| JPS60262260A (en) * | 1984-06-07 | 1985-12-25 | Fujitsu Ltd | Direct memory access and address extension system |
| JPS61112268A (en) * | 1984-11-06 | 1986-05-30 | Yokogawa Hokushin Electric Corp | Dma controller |
-
1987
- 1987-11-20 JP JP1987177324U patent/JPH0537312Y2/ja not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56157520A (en) * | 1980-05-06 | 1981-12-04 | Fujitsu Ltd | Dma system without cycle steal |
| JPS60262260A (en) * | 1984-06-07 | 1985-12-25 | Fujitsu Ltd | Direct memory access and address extension system |
| JPS61112268A (en) * | 1984-11-06 | 1986-05-30 | Yokogawa Hokushin Electric Corp | Dma controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0537312Y2 (en) | 1993-09-21 |
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