The EBE21RD4ABHA is a 256M words × 72 bits, 2 ranks DDR2 SDRAM Module, mounting 36 pieces of 512M bits DDR2 SDRAM with sFBGA stacking technology. Read and write operations are performed at the cross points of the CK and the /CK. This highspeed data transfer is realized by the 4bits prefetchpipelined architecture. Data strobe (DQS and /DQS) both for read and write are available for high speed and reliable data bus design. By setting extended mode register, the on-chip Delay Locked Loop (DLL) can be set enable or disable. This module provides high density mounting without utilizing surface mount technology. Decoupling capacitors are mounted beside each SDRAM on the module board.

*240-pin socket type dual in line memory module (DIMM)
-PCB height: 30.0mm
-Lead pitch: 1.0mm
*1.8V power supply
*Data rate: 533Mbps/400Mbps (max.)
*1.8 V (SSTL_18 compatible) I/O
*Double-data-rate architecture: two data transfers per clock cycle
*Bi-directional, data strobe (DQS and /DQS) is transmitted /received with data, to be used in
capturing data at the receiver
*DQS is edge aligned with data for READs; center aligned with data for WRITEs
*Differential clock inputs (CK and /CK)
*DLL aligns DQ and DQS transitions with CK transitions
*Commands entered on each positive CK edge; data referenced to both edges of DQS
*Four internal banks for concurrent operation (Components)
*Burst length: 4, 8
*/CAS latency (CL): 3, 4, 5
*Auto precharge option for each burst access
*Auto refresh and self refresh modes
*7.8μs average periodic refresh interval
*Posted CAS by programmable additive latency for better command and data bus efficiency
*Off-Chip-Driver Impedance Adjustment and On-Die-Termination for better signal quality
*/DQS can be disabled for single-ended Data Strobe operation
*1 piece of PLL clock driver, 4 piece of register driver and 1 piece of serial EEPROM (2k bits EEPROM) for Presence Detect (PD)


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