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AM1802 Datasheet(PDF) 91 Page - Texas Instruments

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Part # AM1802
Description  AM1802 ARM Microprocessor
PDF  180 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

AM1802 Datasheet(HTML) 91 Page - Texas Instruments

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DDR2/mDDR
Device
RegionshouldencompassallDDR2/mDDRcircuitryandvaries
dependingonplacement.Non-DDR2/mDDRsignalsshouldnotbe
routedontheDDRsignallayerswithintheDDR2/mDDRkeepout
region.Non-DDR2/mDDRsignalsmayberoutedintheregion
providedtheyareroutedonlayersseparatedfromDDR2/mDDR
signallayersbyagroundlayer.Nobreaksshouldbeallowedinthe
referencegroundlayersinthisregion.Inaddition,the1.8Vpower
planeshouldcovertheentirekeepoutregion.
AM1802
www.ti.com
SPRS710C – NOVEMBER 2010 – REVISED MARCH 2012
5.11.3.5 DDR2/mDDR Keep Out Region
The region of the PCB used for the DDR2/mDDR circuitry must be isolated from other signals. The
DDR2/mDDR keep out region is defined for this purpose and is shown in Figure 5-19. The size of this
region varies with the placement and DDR routing. Additional clearances required for the keep out region
are shown in Table 5-28.
Figure 5-19. DDR2/mDDR Keepout Region
Copyright © 2010–2012, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
91
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