MSM518221

E2L0032-17-Y1 ¡ Semiconductor ¡ Semiconductor MSM518221 262,214-Word ¥ 8-Bit Field Memory This version: Jan. 1998 MSM518221 Previous version: Dec. 1996 DESCRIPTION The OKI MSM518221 is a high performance 2-Mbit, 256K ¥ 8-bit, Field Memory. It is designed for high-speed serial access applications such as HDTVs, conventional NTSC TVs, VTRs, digital movies and Multi-media systems. The 2-Mbit capacity fits one field of a conventional NTSC TV screen. Each of the 8-bit planes has separate serial write and read ports. These employ independent control clocks to support asynchronous read and write operations. Different clock rates are also supported, which allow alternate data rates between write and read data streams. The MSM518221 provides high speed FIFO, First-In First-Out, operation without external refreshing: it refreshes its DRAM storage cells automatically, so that it appears fully static to the users. Moreover, fully static type memory cells and decoders for serial access enable the refresh free serial access operation, so that serial read and/or write control clock can be halted high or low for any duration as long as the power is on. Internal conflicts of memory access and refreshing operations are prevented by special arbitration logic. The MSM518221's function is simple, and similar to a digital delay device whose delay-bit-length is easily set by reset timing. The delay length, and the number of read delay clocks between write and read, is determined by externally co...