ZHCSJ47E March 2017 – December 2018 DRA76P , DRA77P
ADVANCE INFORMATION for pre-production products; subject to change without notice.
VREF (ddrx_vref0) is used as a reference by the input buffers of the DDR2 memories as well as the processor. VREF is intended to be half the DDR2 power supply voltage and should be created using a resistive divider as shown in Figure 7-48. Other methods of creating VREF are not recommended. Figure 7-51 shows the layout guidelines for VREF.