PCB size
- Outline of PCB based on Main Components
- Make sure the selected PCB size can fit components
- Place Mounting holes
- Make sure connectors have enough space and there are support mechanical parts
Initial placement
- CPU/ Processor
- User Interfaces
- Connectors eg DDR4 Connector
- Type C USB
- Buttons/ LEDs
- RAMS Should place near to CPU symmetrically in order to easy signal trace length matching
- Also consider space required for length matching since signal trace length matching consumes lot of space
- E-MMC
- WiFI
- Power
- PMIC
- Buck converters/ Boost
After the above is done start placing the following around the CPU, CPU on the TOP side, following components are on the bottom side of the PCB
- Bypass caps should be closer to the pad
- PPU/PD Closer to pad
- REF as close as possible
- Series terminations
- DC Blocking caps closer
- Zener diodes closer to pad
- Ferrite beads
Will have to perform several component placement iterations even after starting the trace layout.
- Start placing other connectors HDMI, USB 3.0, Display connectors
- Place caps /diodes releated to output connectors
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