JPS641043A - Memory access system - Google Patents

Memory access system

Info

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
Application number
JP15553787A
Other languages
Japanese (ja)
Other versions
JPH011043A (en
Inventor
Yutaka Udagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP62-155537A priority Critical patent/JPH011043A/en
Priority claimed from JP62-155537A external-priority patent/JPH011043A/en
Priority to DE3885945T priority patent/DE3885945T2/en
Priority to EP88305704A priority patent/EP0296835B1/en
Publication of JPS641043A publication Critical patent/JPS641043A/en
Publication of JPH011043A publication Critical patent/JPH011043A/en
Priority to US07/582,009 priority patent/US5323488A/en
Pending legal-status Critical Current

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
JP62-155537A 1987-06-24 1987-06-24 Memory access method Pending JPH011043A (en)

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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