[SI-LIST] Re: DDR II Compensation capacitors.
- From: <ryanhb@xxxxxxxxxxxx>
- To: <s.raja@xxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 May 2004 10:13:18 -0400
Raja
It really depends on the memory configuration, but it is likely that the
compensation capacitor for address/command signals will be required for heavily
loaded DDRII systems. Micron has a good description of this approach in their
DDRII app notes, but it basically involves replacing the series stub resistor
on the address bus with a capacitor to ground. With multiple unbuffered DIMMs
at high DDRII speeds this approach will help open the eye for meeting setup and
hold. You will need to simulate your specific configuration to know for sure if
it will help and what component values to use.
Ryan Bethel
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