EP 0161319 A4 19860402 - APPARATUS FOR CONTROLLING WRITING AND READING IN RELATION TO GRAPHIC MEMORY.
Title (en)
APPARATUS FOR CONTROLLING WRITING AND READING IN RELATION TO GRAPHIC MEMORY.
Title (de)
VORRICHTUNG ZUR STEUERUNG DES SCHREIBENS UND DES LESENS FÜR EIN GRAPHISCHES GEDÄCHTNIS.
Title (fr)
APPAREIL DE COMMANDE D'ECRITURE ET DE LECTURE EN RELATION A UNE MEMOIRE GRAPHIQUE.
Publication
Application
Priority
JP 19957183 A 19831025
Abstract (en)
[origin: WO8502050A1] Apparatus for controlling writing and reading in relation to graphic memories (1R, 1G, 1B) for a red screen, a green screen and a blue screen, respectively, each of the graphic memories having a capacity of N x M bits. The apparatus operates in such a manner that data is written into the graphic memories (1R, 1G, 1B) bit by bit and is read out therefrom in units of M bits. The apparatus is capable of modification of one bit per cycle of a CPU (8) with a reduced number of hardware elements. Each of the graphic memories (1R, 1G, 1B) is constituted by an M-bit output RAM group consisting of M 1-bit output RAMs (20? to 27?) each having a capacity of 1 X N bits. Further, the same address space is allotted to the graphic memories (1R, 1G, 1B), and 1-bit data lines of a data bus (9) of the CPU (8) are respectively connected to all the RAMs (20? to 27?) in each of the graphic memories (1R, 1G, 1B). The writing of data, which is effected bit by bit, is carried out in such a manner that one bit of each of the RAMs (20? to 27?) in each of the graphic memories (1R, 1G, 1B) is specified by the CPU address, and a write signal is delivered to any of the desired M RAMs (20? to 27?) with a part of the CPU address.
IPC 1-7
IPC 8 full level
G09G 5/00 (2006.01); G09G 5/02 (2006.01); G09G 5/04 (2006.01)
CPC (source: EP)
G09G 5/022 (2013.01)
Citation (search report)
- [A] EP 0085480 A2 19830810 - EUROP SYSTEMS ELECTRONICS LTD [GB]
- See references of WO 8502050A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8502050 A1 19850509; DE 3480363 D1 19891207; EP 0161319 A1 19851121; EP 0161319 A4 19860402; EP 0161319 B1 19891102; JP S6090387 A 19850521
DOCDB simple family (application)
JP 8400503 W 19841022; DE 3480363 T 19841022; EP 84903820 A 19841022; JP 19957183 A 19831025