Description
The EBS21RC2ACNA is 256M words × 72 bits, 2 banks Synchronous Dynamic RAM Registered Module, mounted 72 pieces of 256M bits SDRAM sealed in TCP package. This module provides high density and large quantities of memory in a small space without utilizing the surface mounting technology. Decoupling capacitors are mounted on power supply line for noise reduction.

FEATUREs
• Fully compatible with 8 bytes DIMM: JEDEC standard outline
• 168-pin socket type dual in line memory module (DIMM)
    - PCB height: 41.91mm (1.65inch )
    - Lead pitch: 1.27mm
• 3.3V power supply
• Clock frequency: 133MHz (max.)
• LVTTL interface
• Data bus width: × 72 ECC
• Single pulsed /RAS
• 4 Banks can operates simultaneously and independently
• Burst read/write operation and burst read/single write operation capability
• Programmable burst length (BL): 1, 2, 4, 8
• 2 variations of burst sequence
    - Sequential
    - Interleave
• Programmable /CAS latency (CL): 2, 3
• Registered inputs with one clock delay
• Byte control by DQMB
• Refresh cycles: 8192 refresh cycles/64ms
• 2 variations of refresh
    - Auto refresh
    - Self refresh
• 1 piece of PLL clock driver, 3 pieces of register driver and 1 piece of serial EEPROM (2k bits) for Presence Detect (SPD) on PCB.