JPS5687149A - Memory access control system - Google Patents
Memory access control systemInfo
- Publication number
- JPS5687149A JPS5687149A JP16502479A JP16502479A JPS5687149A JP S5687149 A JPS5687149 A JP S5687149A JP 16502479 A JP16502479 A JP 16502479A JP 16502479 A JP16502479 A JP 16502479A JP S5687149 A JPS5687149 A JP S5687149A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- input
- output devices
- bus
- transfer
- 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 enable the transfer of effective information, by using the time difference of access time of a memory and a CPU, while switching an address bus, data bus and control bus which are used in common.
CONSTITUTION: Among CPU1, direct memory access device 2 and input and output devices 4W7, the address bus AB, data bus DB, and control bus CB are connected and the transfer of information is made among the memory 3 and the input and output devices 4W7, then the device 2 from CPU1 and the memory 3 via the buses CB, AB and DB, are set with the start address and transfer number of information. Further, connection is made so that the direct memory access DMA can be made to the input and output devices 4W7, and the input and output devices 4W7 connected supply the DMA request to the device 2. Next, the device 2 receives the request and feeds the approval signal to the input and output devices 4W7, the start address of the memory 3 is output to the bus AB, utilizing the time difference of the access time of CPU and memory, allow to transfer the information effectively.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16502479A JPS5687149A (en) | 1979-12-19 | 1979-12-19 | Memory access control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16502479A JPS5687149A (en) | 1979-12-19 | 1979-12-19 | Memory access control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5687149A true JPS5687149A (en) | 1981-07-15 |
Family
ID=15804389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16502479A Pending JPS5687149A (en) | 1979-12-19 | 1979-12-19 | Memory access control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5687149A (en) |
-
1979
- 1979-12-19 JP JP16502479A patent/JPS5687149A/en active Pending
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