JPS641043A - Memory access system - Google Patents
Memory access systemInfo
- Publication number
- JPS641043A JPS641043A JP15553787A JP15553787A JPS641043A JP S641043 A JPS641043 A JP S641043A JP 15553787 A JP15553787 A JP 15553787A JP 15553787 A JP15553787 A JP 15553787A JP S641043 A JPS641043 A JP S641043A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- color
- time
- access
- transferred
- 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
Abstract
PURPOSE: To equally divide and assign a set of unit times to access request sources to operate a memory in each unit time by defining a minimum access time of the memory as the unit time and expressing the wait allowance time of plural access request sources with the set of unit times.
CONSTITUTION: A microprocessor 1 of a system is operated by the control program in a program memory 2, and the whole of a copying machine is controlled by the processor 1. Print data is DMA-transferred between a work memory 5 or a memory 6 and a host interface 4 by a DMA controller 4. Color data read from a color original by a reader 7 is color converted and is compressed to each picture signal by a compressing circuit 8 and is transferred to the memory 6. A precedence control circuit 9 reads out picture data of each color from the memory 6 and sends it to corresponding color data decoding circuits 10W13, and the access to the memory 6 is controlled in accordance with preliminarily determined precedence.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155537A JPH011043A (en) | 1987-06-24 | Memory access method | |
DE3885945T DE3885945T2 (en) | 1987-06-24 | 1988-06-22 | Color printer. |
EP88305704A EP0296835B1 (en) | 1987-06-24 | 1988-06-22 | Colour printer apparatus |
US07/582,009 US5323488A (en) | 1987-06-24 | 1990-09-14 | Memory access method and circuit in which access timing to a memory is divided into N periods to be accessed from N access request sources |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155537A JPH011043A (en) | 1987-06-24 | Memory access method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS641043A true JPS641043A (en) | 1989-01-05 |
JPH011043A JPH011043A (en) | 1989-01-05 |
Family
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