A 128 K×8 70-MHz multiport video RAM with auto registerreload and 8×4 block WRITE feature |
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Authors: | Pinkham R Russell D Balistreri A Herndon TH Anderson D Mehta A Nguyen T Hong NH Sakurai H Hatakoshi S Guillemaud A |
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Affiliation: | Texas Instrum. Inc., Houston, TX; |
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Abstract: | An 80-ns 1-Mb multiport video random-access memory (VRAM) can be organized as 128 K×8 or 256 K×4. Uninterrupted serial data streams of 70 MHz are achieved by combining pipelining and interleaving techniques with an internally triggered automatic memory-to-register transfer mechanism. DRAM bandwidth is enhanced by a block WRITE feature which can write as many as four column address locations in every CAS cycle. The write-per-bit feature has been expanded by including an on-chip write-per-bit latch and an extended mode of operation to simplify its use in a wider range of systems. The VRAM is fabricated in a 1 μm CMOS technology using double-level poly/polycide, single level metal, and trench DRAM storage capacitors for high noise immunity |
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