SPRSP09B December 2017 – January 2019 AMIC120
Refer to the PDF data sheet for device specific package drawings
The region of the PCB used for LPDDR2 circuitry must be isolated from other signals. The LPDDR2 keepout region is defined for this purpose and is shown in Figure 5-82. This region should encompass all LPDDR2 circuitry and the region size varies with component placement and LPDDR2 routing. Non-LPDDR2 signals should not be routed on the same signal layer as LPDDR2 signals within the LPDDR2 keepout region. Non-LPDDR2 signals may be routed in the region provided they are routed on layers separated from LPDDR2 signal layers by a ground layer. No breaks should be allowed in the reference ground or VDDS_DDR power plane in this region. In addition, the VDDS_DDR power plane should cover the entire keepout region.