Unify + document default stackups #61
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Use the new "ground" role to semantically distinguish ground planes from power planes. Explains the SIG/GND/PWR top-3 layer convention for module reusability. Documents the impedance-controlled layers and their reference planes. Signed-off-by: akhilles <akhilvelagapudi@gmail.com>
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| # Layer convention for 4L/6L/8L stackups: | ||
| # - First 3 layers: SIG/GND/PWR (always) | ||
| # - Last layer: SIG (always) | ||
| # | ||
| # This enables module reusability - a 4L module can be ported to 6L/8L by using the | ||
| # same top 3 layers and bottom layer. Internal layers provide additional routing. | ||
| # | ||
| # Impedance Control: | ||
| # - GCPW (Grounded Coplanar Waveguide) for all impedance-controlled routing | ||
| # - L1 (top) is primary impedance-controlled layer | ||
| # - L6/L8 (bottom) serve as backup impedance-controlled layers on 6L/8L | ||
| # - 8L also provides L6 as symmetric stripline (GND/SIG/GND) |
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Use the new "ground" role to semantically distinguish ground planes from power planes. Explains the SIG/GND/PWR top-3 layer convention for module reusability. Documents the impedance-controlled layers and their reference planes.