This section provides the timing specification for the LPDDR2 interface as a PCB design and manufacturing specification. The design rules constrain PCB trace length, PCB trace skew, signal integrity, cross-talk, and signal timing. These rules, when followed, result in a reliable LPDDR2 memory system without the need for a complex timing closure process. For more information regarding guidelines for using this LPDDR2 specification, see Understanding TI's PCB Routing Rule-Based DDR Timing Specification. This application report provides generic guidelines and approach. All the specifications provided in the data manual take precedence over the generic guidelines and must be adhered to for a reliable LPDDR2 interface operation.