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resources:eval:user-guides:adin1300-and-adin1200:layout-considerations [04 Sep 2023 11:23] – [MAC Interface Pins] Mark Bolgerresources:eval:user-guides:adin1300-and-adin1200:layout-considerations [21 Nov 2023 16:57] (current) – [MDI Lines] Mark Bolger
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 ==== MDI Lines ==== ==== MDI Lines ====
  
-The MDI interface runs from the ADIN1300 PHY to the transformer, and from there to the RJ45 connector. Traces running from the MDI_x_x pins of the ADIN1300 to the magnetics must be on the same side of the board, kept as short as possible (ideally less than 1 inch in length), and individual trace impedance of these tracks kept below 50 Ω, with differential impedance of 100 Ω for each pair. The same recommendations apply for traces running from the magnetics to the RJ45 connector. Keep impedances constant throughout because any discontinuities may affect signal integrity.+The MDI interface runs from the ADIN1300 PHY to the transformer, and from there to the RJ45 connector. Traces running from the MDI_x_x pins of the ADIN1300 to the magnetics must be on the same side of the board, kept as short as possible (ideally less than 1 inch in length), but more importantly they should be length matched, for the MDI traces, the intra differential pairs these should be length matched within 20 mils for 1G operation and within 50 mils for 100M or 10M operation. The inter differential pairs are not as critical and should be length matched as close as possible, but within 1000 mils. The individual trace impedance of these tracks kept below 50 Ω, with differential impedance of 100 Ω for each pair. The same recommendations apply for traces running from the magnetics to the RJ45 connector. Keep impedances constant throughout because any discontinuities may affect signal integrity.
  
 Each pair must be routed together, trace widths kept the same throughout, trace lengths kept equal where possible, and avoid any right angles on these traces (use curves in traces or 45° angles). Avoid stubs on all signal traces. Where possible, route traces on the same layer. By taking these guidelines into account the difference in latency between each pair is minimized and this will also help in avoiding an increase in common mode noise. Each pair must be routed together, trace widths kept the same throughout, trace lengths kept equal where possible, and avoid any right angles on these traces (use curves in traces or 45° angles). Avoid stubs on all signal traces. Where possible, route traces on the same layer. By taking these guidelines into account the difference in latency between each pair is minimized and this will also help in avoiding an increase in common mode noise.
resources/eval/user-guides/adin1300-and-adin1200/layout-considerations.txt · Last modified: 21 Nov 2023 16:57 by Mark Bolger

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