![A representative test setup for physical-layer DDR testing A representative test setup for physical-layer DDR testing](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHFfwYRai7B5K2t-ypoz1QS7180xz8K2ZuMLMAxFPuCe9w1H1XA8lA5IqhFaSXqjdQIeL1oWDyeynql5Z6qvya-1p7bA3nqgSxXDf7klvhVGawBT2qAj0MNOZ2xUuk4d_zRehAWKBHihhD/s200/Figure+1.png) |
Figure 1: A representative test setup
for physical-layer DDR testing |
Double data-rate (DDR) memory has ruled the roost as the main system memory in PCs for a long time. Of late, it's seeing more usage in embedded systems as well. Let's look at the fundamentals of a DDR interface and then move into physical-layer testing (Figure 1).