JPS5563423A - Data transfer system - Google Patents
Data transfer systemInfo
- Publication number
- JPS5563423A JPS5563423A JP13665878A JP13665878A JPS5563423A JP S5563423 A JPS5563423 A JP S5563423A JP 13665878 A JP13665878 A JP 13665878A JP 13665878 A JP13665878 A JP 13665878A JP S5563423 A JPS5563423 A JP S5563423A
- Authority
- JP
- Japan
- Prior art keywords
- data transfer
- data
- bus
- zone designation
- designation line
- 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
Landscapes
- Bus Control (AREA)
Abstract
PURPOSE: To increase the system performance, by performing the data transfer in 16 and 32-bits with one data transfer bus and the control of data transfer with zone designation signal, in the data processing system.
CONSTITUTION: The said zone designation line 18 is activated with at least one direct memory access unit (DMA unit) connected to the zone designation line 18. When the DMA unit activating the said zone designation line 18 is in operation, the part between the main memory 10 and the data bus 16 is controlled so that the data transfer using all the buses having the data transfer width given to the data bus 16 can be made. When another DMA unit at least, not connected to the zone designation line 18 is in operation, the part between the main memory 10 and the data bus 16 is controlled so that the data transfer using a part of the bus of the data transfer width given to the data bus 16 can be made.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13665878A JPS6022777B2 (en) | 1978-11-08 | 1978-11-08 | Data transfer method |
US06/377,044 US4514808A (en) | 1978-04-28 | 1982-05-11 | Data transfer system for a data processing system provided with direct memory access units |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13665878A JPS6022777B2 (en) | 1978-11-08 | 1978-11-08 | Data transfer method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5563423A true JPS5563423A (en) | 1980-05-13 |
JPS6022777B2 JPS6022777B2 (en) | 1985-06-04 |
Family
ID=15180465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13665878A Expired JPS6022777B2 (en) | 1978-04-28 | 1978-11-08 | Data transfer method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6022777B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5729935U (en) * | 1980-07-28 | 1982-02-17 | ||
JPS5990131A (en) * | 1982-11-12 | 1984-05-24 | Nec Corp | Transfer device of direct memory access |
JPH0399353A (en) * | 1989-09-05 | 1991-04-24 | Internatl Business Mach Corp <Ibm> | Data buffer mechanism |
-
1978
- 1978-11-08 JP JP13665878A patent/JPS6022777B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5729935U (en) * | 1980-07-28 | 1982-02-17 | ||
JPS5990131A (en) * | 1982-11-12 | 1984-05-24 | Nec Corp | Transfer device of direct memory access |
JPH0399353A (en) * | 1989-09-05 | 1991-04-24 | Internatl Business Mach Corp <Ibm> | Data buffer mechanism |
Also Published As
Publication number | Publication date |
---|---|
JPS6022777B2 (en) | 1985-06-04 |
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