Multi-mode memory device

Static information storage and retrieval – Addressing – Byte or page addressing

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365 78, 36518912, G11C 700, G11C 1142

Patent

active

049473808

ABSTRACT:
The invention relates to a memory device of the charge-coupled shift register type which is subdivided into four sections each of which has a storage capacity of, for example 208,800 bits and which can operate in different modes: parallel-in/parallel-out (as background video memory); 2.times.2 parallel-in, demultiplex/multiplex mode, for example for 100 Hz TV; scan mode; parallel-in-recirculation mode; "shortened" memory, for example for 525-line system, etcetera. Control is realized via a decoding and timing block in which a multi-bit control word is serially input and decoded. In a scan mode (for example, as a teletext memory), the memory sections are scanned one-by-one under the control of a separate scan register in which a scan bit (logic 1) is step-wise shifted until all sections have been read. Via a data output, the scan bit is transferred, for example to the scan register of a further memory device (via its serial data input) which is connected in series with the former memory device.

REFERENCES:
patent: 4103347 (1978-07-01), Barton
patent: 4150364 (1979-04-01), Baltzer
patent: 4225947 (1980-09-01), Councill et al.
patent: 4663735 (1987-05-01), Novak et al.
patent: 4679083 (1987-07-01), Schmitz
patent: 4680738 (1987-07-01), Tam
patent: 4747081 (1988-05-01), Heilveil et al.
patent: 4796231 (1989-01-01), Pinkham
Berkhoff et al., "Applications of Picture Memories in Television Receivers", IEEE Trans. Consum. Elec., vol. CE-29, No. 3, Aug. 1983, pp. 251-258.

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