ZHCSJ48F December 2016 – December 2018 TDA2P-ABZ
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 7-51. Other methods of creating VREF are not recommended. Figure 7-54 shows the layout guidelines for VREF.