SM55161A - Austin Semiconductor

SM55161A 262144 x 16 BIT VRAM MULTIPORT VIDEO RAM

PIN A0-A8 CASL, CASU DQ0-DQ15 DSF NC/GND DESCRIPTION Address inputs Column-Address Strobe/Byte Selects DRAM Data I/O, Write Mask Data Special Function Select Special-Function Select No Connect/Ground (NOTE: Not connected internally to VSS) Special-Function Output Row-Address Strobe Serial Clock Serial Enable Serial-Data Output Output Enable, Transfer Select.

Features

• Organization:
  – DRAM: 262 144 by 16 Bits
  – SAM: 512 by 16 Bits
• Dual-Port Accessibility
  – Simultaneous and Asynchronous Access From the DRAM and SAM Ports
• Bidirectional Data-Transfer Function From the DRAM to the Serial-Data Register, and from Serial Data Register to DRAM
• (8 x 8) x 2 Block Write feature for fast area fill
• Write-Per-Bit Feature for Selective Write to Each RAM I/O; Two Write-Per-Bit Modes to Simplify System Design
• Byte-Write Control (CASL, CASU) Provides Flexibility
• Extended Data Output for Faster System Cycle Time
• Enhanced Page-Mode Operation for Faster Access
• .