The documentation area is where you can find extensive, versioned information about our software online, for free. (I1.388860) 142 0 R (I1.388872) 143 0 R (I1.388898) 144 0 R (I1.391890) 145 0 R (I1.392010) 146 0 R If you can spot impedance discontinuities, you can prevent excess insertion/return losses in leading to your DDR4 memory modules. The DDR3 routing guidelines section in the AM335x datasheet are different from what I expected. endobj >> One approach to achieving greater signal sensitivity and constraints involves bundling the data byte lanes. If you're routing on the inner layers, striplines or dual striplines can be used for differential pairs. /Rect [360 405.18 558 414.54] AN3940: This document provides general hardware and layout considerations and guidelines for hardware engineers implementing a DDR3 memory subsystem. /ProcSet [/PDF /Text /ImageC]

(P.2) 221 0 R (P.3) 222 0 R (P.4) 223 0 R (P.5) 224 0 R (P.6) 225 0 R /Rotate 0 stream


(M9.11897.Heading2.1.Designers.Checklist) 182 0 R (M9.13273.FigTitle.Figure2.Alternating.Data.Byte.Lanes.on.Different.Critical.LayersPart.2) 183 0 R (M9.14960.TBTitle.Table4.DDR.Signal.Groups.Layout.Recommendations) 184 0 R (M9.15924.TBItemC.51) 185 0 R (M9.16926.Heading2.3.DDR.VTT.Voltage.Rail) 186 0 R (P.14) 216 0 R (P.15) 217 0 R (P.16) 218 0 R (P.17) 219 0 R (P.18) 220 0 R

DDR2/DDR3 Low-Cost PCB Design Guidelines for Artix-7 and Spartan-7 FPGAs Routing Channels are the total number of available routing paths out of the BGA—e.g., (Number of BGA balls on one side –1)× four sides. The layout scheme in fly-by topology is preferrable over a double-T topology for multiple signal integrity reasons. /Dests 12 0 R /Type /Annot

I modeld the setup from Xlinx's guideline for DDR4 in HyperLynx and found out that impedance discontinuity does not affect much signal qualty.
DDR3 SDRAM Memory Interface How the Open Source Ventilator Project Went from Design to Build in Record Time. /Creator (FrameMaker 7.2) << Be careful with selecting the spacing between traces and pairs from application notes as these often assume a specific layer stack. << /Type /Annot /T1_0 37 0 R ������G;7/�Yd;��! Prior to working in the PCB industry, he taught at Portland State University. His work has been published in over a dozen peer-reviewed journals and conference proceedings, and he has written hundreds of technical blogs on PCB design for a number of companies. /Title (8 Revision history) << With the schematic in hand, you can locate key components and nets. endobj

Note that the JEDEC spec for DDR3 and specifies two drive strengths at 34 and 40 Ω for single-ended I/Os. (G385635) 78 0 R (G385642) 79 0 R (G385650) 80 0 R (G385666) 81 0 R (G385720) 82 0 R DDR3 Routing Topology DDR3 - Introduction Double data rate three (DDR3) is a type of dynamic random-access memory ( DRAM ) released in June of 2007 as the successor to DDR2 . While routing a DDR4 memory I have found that in "PCB Guidelines for DDR4 SDRAM"  there are different trace impedance for a Address/Command/Control signals (for example on page 43). May be there are some SI or EMI issues or something else? /Outlines 6 0 R (G392671) 108 0 R (G397544) 109 0 R (G397551) 110 0 R (G397579) 111 0 R (G397586) 112 0 R endobj Fly-by topology is shown below. • USB - For more information, see the High-Speed Interface Layout Guidelines 6 Designing the Power Subsystem Once the block diagram has been validated for pin multiplexing, electrical, and timing compatibility, the /Length 66

(I1.399767) 167 0 R (I1.399780) 168 0 R (I1.399794) 169 0 R (I1.399807) 170 0 R (I1.399821) 171 0 R 2y�.-;!���K�Z� ���^�i�"L��0���-�� @8(��r�;q��7�L��y��&�Q��q�4�j���|�9�� >> endobj Each branch could split again to support 2 chips each, for a total of 4 chips. DDR3 SDRAM is the third generation of the DDR SDRAM family, and offers stream /Contents [32 0 R 33 0 R] /Type /Metadata

/Length 2575


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