Circuit and Functional Design Technologies for 2 Mb VRAM

Katsuyuki SATO  Masahiro OGATA  Miki MATSUMOTO  Ryouta HAMAMOTO  Kiichi MANITA  Terutaka OKADA  Yuji SAKAI  Kanji OISHI  Masahiro YAMAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.11   pp.1632-1640
Publication Date: 1993/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on LSI Memories)
Category: Application Specific Memory
integrated electronics,  electronics circuit,  memory technologies,  video RAM,  

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Four circuit techniques and a layout design scheme were proposed to realize a 2 Mb VRAM used 0.8 µm technology. They are the enhanced circuit technologies for high speed operation, the functional circuit design and the effective repair schemes for a VRAM, the low power consumption techniques to active and standby mode and a careful layout design scheme realizing high noise immunity. Using these design techniques, a 2 Mb VRAM is suitable for the graphics application of a 5125128 pixels basis screen, with a clear mode of 4.6 GByte/sec and a 4-multi column write mode of 400 MByte/sec, even using the same 0.8 µm technology as the previous VRAM (1 Mb) was realized.