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HM538123BJ-8
HM538123B Series 1 M VRAM (128-kword × 8-bit) ADE-203-231D (Z) Rev. 4.0 Nov. 1997 Description The HM538123B is a 1-Mbit multiport video RAM equipped with a 128-kword × 8-bit dynamic RAM and a 256-word × 8-bit SAM (serial access memory). Its RAM and SAM operate independently and asynchronously. It can transfer data between RAM and SAM. In addition, it has two modes to realize fast writing in RAM. Block write and flash write modes clear the data of 4-word × 8-bit and the data of one row (256-word × 8-bit) respectively in one cycle of RAM. And the HM538123B makes split transfer cycle possible by dividing SAM into two split buffers equipped with 128-word × 8-bit each. This cycle can transfer data to SAM which is not active, and enables a continuous serial access. Features • Multiport organization Asynchronous and simultaneous operation of RAM and SAM capability RAM: 128-kword × 8-bit and SAM: 256-word × 8-bit • Access time RAM: 60 ns/70 ns/80 ns/100 ns max SAM: 20 ns/22 ns/25 ns/25 ns max • Cycle time RAM: 125 ns/135 ns/150 ns/180 ns min SAM: 25 ns/25 ns/30 ns/30 ns min • Low power Active RAM: 413 mW max SAM: 275 mW max Standby 38.5 mW max • High-speed page mode capability • Mask write mode capability • Bidirectional data transfer cycle between RAM and SAM capability • Split transfer cycle capability • Block write mode capability • Flash write mode capability
ELPIDA
エルピーダメモリ株式会社
日本
DRAM（ダイナミック・ランダム・アクセス・メモリ）のリーディングカンパニーです。世界トップレベルの技術力により、開発・設計・製造・販売活動を積極的に展開しています。
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