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TMS320DM647_0804 데이터시트(PDF) 104 Page - Texas Instruments

부품명 TMS320DM647_0804
상세설명  Digital Media Processor
PDF  182 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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TMS320DM647_0804 데이터시트(HTML) 104 Page - Texas Instruments

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6.9.3.10 VREF Routing
DM648
Device
A1
A1
DDR2Device
VREFNominalMinimum
TraceWidthis20Mils
VREFBypassCapacitor
NeckdowntominimuminBGA escape
regionsisacceptable.Narrowingto
accomodateviacongestionforshort
distancesisalsoacceptable.Best
performanceisobtainedifthewidth
ofVREFismaximized.
6.9.3.11 DDR2 CK and ADDR_CTRL Routing
A1
A1
A
T
DM648
TMS320DM647/TMS320DM648
Digital Media Processor
SPRS372B – MAY 2007 – REVISED APRIL 2008
www.ti.com
VREF is used as a reference by the input buffers of the DDR2 memories as well as the DM647’s. VREF is
intended to be 1/2 the DDR2 power supply voltage and should be created using a resistive divider as
shown in Figure 6-12. Other methods of creating VREF are not recommended. Figure 6-16 shows the
layout guidelines for VREF.
Figure 6-16. VREF Routing and Topology
Figure 6-17 shows the topology of the routing for the CK and ADDR_CTRL net classes. The route is a
balanced T as it is intended that the length of segments B and C be equal. In addition, the length of A
should be maximized.
Figure 6-17. CK and ADDR_CTRL Routing and Topology
Peripheral Information and Electrical Specifications
104
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