DDR2 signalling basics

[hithesh123]

I am lookign for some materials on DDR2 signalling (SSTL_18).
I read the Jedec specs. They just give the signalling levels.

I need a more basic intro sstl 18 signalling. Why Vref is used and the Vac and Vdc specs etc.

 

[rhaynes]

Try the Micron data sheets and technical notes:

http://www.micron.com/support/technotes.html?domain=English&kind=Category&type=Technical Note&path=products/dram/ddr2_sdram

And there is some good information in this Hynix app note:

http://www.hynix.com/datasheet/Timing_Device/DDR2_device_operation&timing_diagram(Rev.0.1).pdf

Ray