Texas Instruments AM18x eXperimenter's Kit TMDSEXP1808L TMDSEXP1808L 데이터 시트
제품 코드
TMDSEXP1808L
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
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
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 device.
VREF is intended to be half the DDR2/mDDR power supply voltage and should be created using a
resistive divider as shown in
VREF is intended to be half the DDR2/mDDR power supply voltage and should be created using a
resistive divider as shown in
. Other methods of creating VREF are not recommended.
shows the layout guidelines for VREF.
Figure 6-20. VREF Routing and Topology
118
Peripheral Information and Electrical Specifications
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