QUICK EYE-DIAGRAM SCAN A DDR memory interface can be made up of many DQ (data) channels. For instance, a DDR DIMM (dual-inline memory module) consists of 64 DQ channels that equal 64 bits or 8 bytes.

On an oscilloscope's eye-pattern diagram, the distance between peak deterministic and random jitter amplitudes (the unit interval, or UI) is often called a "bathtub," which functions as a bit ...