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Subject: Re: hardware question (SDRAM or DDRAM?)

Author: Matt Taylor

Date: 14:44:50 12/04/02

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On December 04, 2002 at 12:03:02, Dan Andersson wrote:

>It is almost certain that SDRAM will have lower latency than DDRAM.
>
>MvH Dan Andersson

How can SDRAM have a lower latency than DDR SDRAM? DDR SDRAM -is- SDRAM that can
transmit on both the rising and falling edges of a clock cycle rather than a
single edge.

In actuality, they have approximately the same latency. SDRAM parts are CL=2 or
CL=3. DDR parts are CL=2 or CL=2.5. The CAS latency is measured in bus clocks. A
bus clock on pc100 SDRAM is the same length of time as a bus clock on pc1600 DDR
SDRAM. Likewise pc133 SDRAM and pc2100 DDR SDRAM are equivalent (both run 133
MHz frequencies).

-Matt



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