Description
The EBE10RD4AEFA is a 128M words × 72 bits, 1 rank DDR2 SDRAM Module, mounting 18 pieces of DDR2 SDRAM sealed in FBGA package. Read and write operations are performed at the cross points of the CK and the /CK. This high-speed data transfer is realized by the 4bits prefetch-pipelined architecture.

FEATUREs
• 240-pin socket type dual in line memory module (DIMM)
    - PCB height: 30.0mm
    - Lead pitch: 1.0mm
    - Lead-free (RoHS compliant)
• Power supply: VDD = 1.8V ± 0.1V
• Data rate: 667Mbps (max.)
• 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
• Average refresh period
    - 7.8µs at 0°C ≤ TC ≤ +85°C
    - 3.9µs at +85°C < TC ≤ +95°C
• Posted CAS by programmable additive latency for better command and data bus efficiency
• Off-Chip-Driver Impedance Adjustment and On-DieTermination for better signal quality
• /DQS can be disabled for single-ended Data Strobe operation
• 1 piece of PLL clock driver, 2 pieces of register driver and 1 piece of serial EEPROM (2k bits EEPROM) for Presence Detect (PD)