Arrangement of a dynamic random access memory

Details Arrangement of a dynamic random access memory Arrangement of a dynamic random access memory

1982-09-27

1985-12-10

Popek, Joseph A.

Static information storage and retrieval

Addressing

365189, G11C 1140

Patent

active

045584362

ABSTRACT:
The dynamic random access memory for use in a video circuit scanning video images according to the interlaced scanning method and reproducing the images on monitors of different resolutions is described. The RAM memory is composed of as many RAM segments as there are graduations of picture elements available, each segment including a plurality of RAM chips determined by the minimum read/write cycle time and by the scanning cycle time. To speed up the addressing during the switchover from the low-resolution to a high-resolution reception, the memory is organized into two halves, for storing respectively signals pertaining to odd-numbered and even-numbered picture lines. In each half, the vertical columns are subdivided into groups of lines pertaining to a single video data word. The adjoining pairs of columns store the signals pertaining to corresponding pairs of consecutive video lines which, in each pair, are arranged one below the other. In this manner the access time in the memory during the low-resolution is made faster.

REFERENCES:
patent: 4092728 (1978-05-01), Baltzer
patent: 4370712 (1983-01-01), Johnson et al.
patent: 4375678 (1983-03-01), Krebs, Jr.

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