Title :
A dynamic DFI-compatible strobe qualification system for Double Data Rate (DDR) physical interfaces
Author :
Alexandropoulos, Alexios ; Plessas, Fotis ; Birbas, Michael
Author_Institution :
Analogies S.A., Rio, Greece
Abstract :
In this work a dynamic strobe masking system (DSMS) for DDR memory interfaces is presented which works with existing DFI signals to provide dynamic masking and produces a clean strobe suitable for data capture, making it the first dynamic DFI-compatible strobe qualification system. This DSMS scheme produces a masking signal to qualify the expected pulse stream on the DQS line, thus masking out other spurious activity. Post layout simulation results in TSMC 90 nm process validate the proposed masking system in the 200-533 MHz range, meeting the mask shut-off specification in best, typical, and worst case corners.
Keywords :
DRAM chips; DFI-compatible strobe qualification system; DQS line; data capture; double data rate physical memory interface; dynamic strobe masking system; frequency 200 MHz to 533 MHz; masking signal; pulse stream; size 90 nm; Logic gates; DDR-PHY Interface (DFI); Double Data Rate (DDR); Strobe Marking;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-8155-2
DOI :
10.1109/ICECS.2010.5724507
