JPS5533268A - Dma system for electronic computer - Google Patents
Dma system for electronic computerInfo
- Publication number
- JPS5533268A JPS5533268A JP10640578A JP10640578A JPS5533268A JP S5533268 A JPS5533268 A JP S5533268A JP 10640578 A JP10640578 A JP 10640578A JP 10640578 A JP10640578 A JP 10640578A JP S5533268 A JPS5533268 A JP S5533268A
- Authority
- JP
- Japan
- Prior art keywords
- dma
- cpu
- transfer
- drum
- ram
- 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
Landscapes
- Bus Control (AREA)
Abstract
PURPOSE: To increase a processing speed by disconnecting CPU from DMA operation until the DMA operation ends, by giving indication relating the DMA operation at an operation start.
CONSTITUTION: To transfer data between shared RAM 12 and drum 17, CPU 11 sends commands TRACK NO, SECTOR NO and READ/WRITE of drum 17 to the magnetic drum 17 via DCU 14. On receiving a START ADDRESS signal, etc., DMA unit 13 start DMA transfer. Once the DMA transfer is started, shared, RAM 12 and DMA unit 13 are connected together. When fixed transfer is done between shared RAM 12 and magnetic drum 17, DMA 13 connects shared RAM 12 to CPU bus 18 and sends a STATUS signal of READY back to CPU 11 via DCU 14, thereby finishing the DMA operation.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640578A JPS5533268A (en) | 1978-08-31 | 1978-08-31 | Dma system for electronic computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640578A JPS5533268A (en) | 1978-08-31 | 1978-08-31 | Dma system for electronic computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5533268A true JPS5533268A (en) | 1980-03-08 |
Family
ID=14432762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10640578A Pending JPS5533268A (en) | 1978-08-31 | 1978-08-31 | Dma system for electronic computer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5533268A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6155763A (en) * | 1984-08-27 | 1986-03-20 | Fujitsu Ltd | Channel data storing control system in control device |
| JPH06105447B2 (en) * | 1989-08-23 | 1994-12-21 | ディジタル イクイップメント コーポレーション | Data processing system device and method for controlling the same |
-
1978
- 1978-08-31 JP JP10640578A patent/JPS5533268A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6155763A (en) * | 1984-08-27 | 1986-03-20 | Fujitsu Ltd | Channel data storing control system in control device |
| JPH06105447B2 (en) * | 1989-08-23 | 1994-12-21 | ディジタル イクイップメント コーポレーション | Data processing system device and method for controlling the same |
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