FreeScale DRR NoteFreescale Semiconductor Application Note Document Number: AN2582 Rev. 4, 10/2005 Hardware and Layout Design Considerations for DDR Memory Interfaces by DSD Applications Freescale Semiconductor, Inc. Austin, TX Embedded systems that utilize double data rate memory (DDR) can realize increased performance over traditional single data rate (SDR) memories. As the name implies, DDR enables two data transactions to occur within a single clock cycle without having to double the applied clock or without having to double the size of the data bus. This increased data bus performance is achieved by the introduction of source-synchronous data strobes that permit data to be captured on both the falling and rising edges of the strobe. Although DDR can bring improved performance to an embedded design,……