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AM3359 Datasheet(PDF) 167 Page - Texas Instruments |
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AM3359 Datasheet(HTML) 167 Page - Texas Instruments |
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167 / 236 page ![]() AM335x A1 A1 DDR2 Device DDR_VREF Nominal Minimum Trace Width is 20 Mils DDR_VREF Bypass Capacitor Neck down to minimum in BGA escape regions is acceptable. Narrowing to accommodate via congestion for short distances is also acceptable. Best performance is obtained if the width of DDR_VREF is maximized. AM3359, AM3358, AM3357 AM3356, AM3354, AM3352 www.ti.com SPRS717F – OCTOBER 2011 – REVISED APRIL 2013 5.6.2.2.2.10 DDR_VREF Routing DDR_VREF is used as a reference by the input buffers of the DDR2 memories as well as the AM335x device. DDR_VREF is intended to be half the DDR2 power supply voltage and should be created using a resistive divider as shown in Figure 5-39 and Figure 5-40. Other methods of creating DDR_VREF are not recommended. Figure 5-43 shows the layout guidelines for DDR_VREF. Figure 5-43. DDR_VREF Routing and Topology Copyright © 2011–2013, Texas Instruments Incorporated Peripheral Information and Timings 167 Submit Documentation Feedback Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 |
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