DESCRIPTION

The ISSI IS42G32256 is a high-speed 16-Mbit CMOS Synchronous Graphics RAM organized as 256K words x 32 bits x 2 banks. With SGRAM, all input and output signals are synchronized with the rising edge of the system clock. Programmable Mode Register and Special Registers provide a choice of Read or Write burst lengths of 1, 2, 4, or 8 locations or a Full Page with burst termination options. The SGRAM performance is enhanced with the Write-per-bit (WPB) and eight columns of Block Write functions.

FEATURES

? 256,144 words x 32 bits x 2-bank organization

? All inputs are sampled at the positive going edge of the system clock

? Dual internal bank control

? Single 3.3V ± 3V power supply

? Programmable mode register

– Burst length (1, 2, 4, 8, and full page)

– CAS latency (2 and 3)

– Burst type: Sequential and Interleave

? Burst Read single-bit Write Operation

? Refresh capability

– Auto, self-refresh

? 2,048 refresh cycles/32 ms

? LVTTL compatible inputs and outputs

? 100-pin PQFP (14mm x 20mm)

GRAPHIC FEATURES

? SMRS cycle

– Load mask register

– Load color register

? Write per bit (old mask)

? Block write (eight columns)