Memory Module

Memory module:
Specification:
DDR 400 MHz,
184-pin socket type dual in line memory module (DIMM)
2.6V power supply
Data rate: 400Mbps (max. )
2.5 V (SSTL_2 compatible) I/O
Double Data Rate architecture; Two data transfers per clock cycle
Bi-directional, data strobe (DQS) is transmitted/received with data, to be used in capturing data at the receiver
Data inputs and outputs are synchronized with DQS
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
Auto precharge option for each burst access
Programmable burst length: 2, 4, 8
Programmable /CAS latency (CL): 3
Programmable output driver strength: Normal
Refresh cycles: (8192 refresh cycles /64ms)
7.8us maximum average periodic refresh interval
2 variations of refresh
Auto refresh
Self refresh