A1
A1
DDR2/mDDR Device
VREF Nominal Minimum
Trace Width is 20 Mils
VREF Bypass Capacitor
Neck down to minimum in BGA escape
regions is acceptable. Narrowing to
accomodate via congestion for short
distances is also acceptable. Best
performance is obtained if the width
of VREF is maximized.
DDR2/mDDR
128
TMS320C6748
SPRS590G – JUNE 2009 – REVISED JANUARY 2017
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Peripheral Information and Electrical Specifications
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6.11.3.10 VREF Routing
VREF is used as a reference by the input buffers of the DDR2/mDDR memories as well as the C6748.
VREF is intended to be half the DDR2/mDDR power supply voltage and should be created using a
resistive divider as shown in
Figure 6-18
. Other methods of creating VREF are not recommended.
Figure 6-22
shows the layout guidelines for VREF.
Figure 6-22. VREF Routing and Topology