Routing changes were made to improve signal timing.
DDR guidelines can be found from most DDR suppliers. Low power DDR routing is similar to 2.5V DDR, except the lower voltage reduces signal threshold margin so your traces must be matched closer depending on dielectric your are routing through.
If you need help laying out your product, or want LPD to layout your project for you, please contact
product.sales@logicpd.com for more information. LPD has a full service design group that can help you in design, layout, manufacturing, and packaging.
-Kurt