Overview

The VG4616321(2) SGRAM is a high-speed CMOS synchronous graphics RAM containing 16M bits. It is internally configured as a dual 256K x 32 DRAM with a synchronous interface (all signals are registered on the positive edge of the clock signal, CLK). Each of the 256K x 32 bit banks is organized as 1024 rows by 256 columns by 32 bits. Read and write accesses to the SGRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of a BankActivate command which is then followed by a Read or Write command.

特性 Features

? Fast access time from clock: 4.5/5/5.5ns

? Fast clock rate: 200/166/143 MHz

? Fully synchronous operation

? Internal pipelined architecture

? Dual internal banks(256K x 32-bit x 2-bank)

? Programmable Mode and Special Mode registers

- CAS Latency: 1, 2, or 3

- Burst Length: 1, 2, 4, 8, or full page

- Burst Type: interleaved or linear burst

- Burst Read Single Write

- Load Color or Mask register

? Burst stop function

? Individual byte controlled by DQM0-3

? Block write and write-per-bit capability

? Auto Refresh and Self Refresh

? 2048 refresh cycles/32ms

? Single + 3.3V ±0.3V power supply

? Input Reference Voltage : Vref = 1.5V ±0.2V

? Interface: LVTTL and SSTL_3

? JEDEC 100-pin Plastic QFP package