GENERAL DESCRIPTION
FOR 1M x 32Bit x 4 Bank GDDR2 SDRAM
The 4Mx32 GDDR2 is 134,217,728 bits of hyper synchronous data rate Dynamic RAM organized as 4 x 1,048,976 words by 32 bits, fabricated with SAMSUNG’s high performance CMOS technology. Synchronous features with Data Strobe allow extremely high performance up to 4GB/s/chip. I/O transactions are possible on both edges of the clock cycle. Range of operating frequencies, and programmable latencies allow the device to be useful for a variety of high performance memory system applications.

FEATURES
• 2.5V + 0.1V power supply for device operation
• 1.8V + 0.1V power supply for I/O interface
• On-Die Termination for all inputs except CKE,ZQ
• Output Driver Strength adjustment by EMRS
• SSTL_18 compatible inputs/outputs
• 4 banks operation
• MRS cycle with address key programs
    - CAS latency : 5, 6, 7 (clock)
    - Burst length : 4 only
    - Burst type : sequential only
• Additive latency (AL): 0,1(clock)
• Read latency(RL) : CL+AL
• Write latency(WL) : AL+1
• Differential Data Strobes for Data-in, Date out ;
    - 4 DQS and /DQS(one differential strobe per byte)
    - Single Data Strobes by EMRS.
• Edge aligned data & data strobe output
• Center aligned data & data strobe input
• DM for write masking only
• Auto & Self refresh
• 32ms refresh period (4K cycle) (16ms is under consideration)
• 144 Ball FBGA
• Maximum clock frequency up to 500MHz
• Maximum data rate up to 1Gbps/pin
• DLL for Address, CMD and outputs