JPH026352U - - Google Patents
Info
- Publication number
- JPH026352U JPH026352U JP8152288U JP8152288U JPH026352U JP H026352 U JPH026352 U JP H026352U JP 8152288 U JP8152288 U JP 8152288U JP 8152288 U JP8152288 U JP 8152288U JP H026352 U JPH026352 U JP H026352U
- Authority
- JP
- Japan
- Prior art keywords
- dma controller
- control device
- enable signal
- predetermined value
- request
- 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
Links
- 230000000903 blocking effect Effects 0.000 claims 1
- 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
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Bus Control (AREA)
Description
第１図は本考案の一実施例の構成を示した図、
第２図は第１図の装置の動作説明用のタイムチヤ
ートである。
１０……制御装置、１１……ＤＭＡＣ、１２…
…カウンタ、１３……デコーダ、１４……ナンド
ゲート、２０……ＭＰＵ、４０……バスマスタ、
５０……データバス。
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a time chart for explaining the operation of the apparatus shown in FIG. 10...control device, 11...DMAC, 12...
... Counter, 13 ... Decoder, 14 ... NAND gate, 20 ... MPU, 40 ... Bus master,
50...Data bus.
Claims (1)
いて、 ＤＭＡコントローラがＤＭＡ動作をしていると
きに、転送語数をカウントし、カウントが所定値
に達したところでリクエスト・イネーブル信号を
変化させる計数手段と、 前記リクエスト・イネーブル信号が変化すると
、ＤＭＡコントローラへの転送要求信号の供給を
阻止してＤＭＡコントローラにバス権を放させる
ゲート、 を具備したことを特徴とする制御装置。 (2) 前記所定値が可変であることを特徴とする
実用新案登録請求の範囲第(1)項記載の制御装置
。[Claims for Utility Model Registration] (1) In a control device having a DMA controller, the DMA controller counts the number of transferred words while performing DMA operation, and issues a request enable signal when the count reaches a predetermined value. A control device comprising: a counting means for changing the request enable signal; and a gate for blocking the supply of the transfer request signal to the DMA controller and causing the DMA controller to release the bus right when the request enable signal changes. (2) The control device according to claim (1), wherein the predetermined value is variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8152288U JPH026352U (en) | 1988-06-20 | 1988-06-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8152288U JPH026352U (en) | 1988-06-20 | 1988-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH026352U true JPH026352U (en) | 1990-01-17 |
Family
ID=31306301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8152288U Pending JPH026352U (en) | 1988-06-20 | 1988-06-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH026352U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS552679U (en) * | 1978-06-22 | 1980-01-09 |
-
1988
- 1988-06-20 JP JP8152288U patent/JPH026352U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS552679U (en) * | 1978-06-22 | 1980-01-09 | ||
| JPS5821756Y2 (en) * | 1978-06-22 | 1983-05-09 | 積水化成品工業株式会社 | mold making device |
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