High Speed Memory Module

  • Published : 2006.10.11

Abstract

[ $\blacksquare$ ] I/O Signal $\square$ We see adequate margin for the RC B design $\square$ Minimum ODW value is 328ps using Ac to DC measurement for the read case. $\square$ Minimum ODW value is 350ps using AC to DC mesurement method for the write case. $\blacksquare$ CLK Signal $\square$ The slew-rate decreases when the Cterm value increases $\square$ Lower slew-rate could effect delay and jitter. $\square$ There are some ldge issues during transitions with lower Cterm and without Cterm. $\square$ Our recommendation for the Cterm value range is between 1.5pF to 2.4pF. $\blacksquare$ ADD/CMD/Ctrl Signal $\square$ High output slew-rate at low VDD causes ring back that reduces voltage margin because of x-talk. $\square$ 30ohm Rterm for the CTRL signal shows a better signal integrity result compared to 36ohm.

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