W641GG2JB中文資料華邦電子數(shù)據(jù)手冊PDF規(guī)格書

GENERAL DESCRIPTION

The W641GG2JB 1-Gbit GDDR3 GRAPHICS SDRAM is a high speed dynamic random-access memory designed for applications requiring high bandwidth. It contains 1,073,741,824 bits. The device can be configured to operate in two different modes:

? in 2-CS mode the chip is organized as two 512 Mbit memories of 8 banks each, with 4096 row locations and 512 column locations per bank.

? in 1-CS mode the chip is organized as one 1 Gbit memory, with 8192 row locations and 512 column locations perbank.

The GDDR3 GRAPHICS SDRAM uses a double data rate architecture to achieve high speed operation. The double

data rate architecture is essentially a 4n prefetch architecture with an interface designed to transfer two data words per clock cycle at the I/O pins. A single read or write access for the GDDR3 GRAPHICS SDRAM effectively consists of a 4n data transfer every two clock cycles at the internal DRAM core and four corresponding n-bit wide, one-half-clock cycle data transfers at the I/O pins.

FEATURES

? Density: 1Gbit

? Power supply (VDD, VDDQ): 1.8V 0.1V

? Organization: 1 Chip Select x 8 banks x 4M words x 32 bits (1-CS mode) and 2 Chip Select x 8 banks x 2M words x 32 bits (2-CS mode)

? Eight internal banks per Chip Select for concurrent operation

? 4n prefetch architecture: 128 bit per array Read or Write access

? Double-data rate architecture: two data transfers per clock cycle

? Single ended interface for data, address and command

? Differential clock inputs CLK, CLK#

? Commands entered on each positive CLK edge

? Single ended Read strobe (RDQS) per byte, edge-aligned with Read data

? Single ended Write strobe (WDQS) per byte, center aligned with Write data

? Write data mask (DM) function

? DLL aligns DQ and RDQS transitions with CLK clock edges for Reads

? Burst length (BL): 4 or 8

? Sequential burst type only

? Programmable CAS latency: 7 to 14

? Programmable Write latency: 3 to 7

? Auto precharge option for each burst access

? Pseudo open drain outputs with 40 pulldown, 40 pullup

? ODT: nom. values of 60 , 120 or 240

? Programmable termination and driver strength offsets

? Refresh cycles: 8192 cycles/32ms

? Auto-refresh and self-refresh modes

? ODT and output drive strength auto-calibration with external resistor ZQ pin (240 )

? Programmable IO interface including on chip termination (ODT)

? tRAS lockout support

? Vendor ID for device identification

? Mirror function with MF pin

? Boundary Scan function with SEN pin

? tWR programmable for Writes with Auto-Precharge

? Calibrated output drive. Active termination support

? Short RAS to CAS timing for Writes

? Operating case temperature range: Tcase = 0°C to +105°C

? Package: 136-ball TFBGA.

? RoHS Compliant Product