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USB 2.0 PCB Layout Recommendations for the CY7C68013 EZ-USB FX2

USB 2.0 PCB Layout Recommendations for the CY7C68013 EZ-USB FX2

Anonymous
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What are the USB 2.0 PCB Layout Recommendations for the CY7C68013 EZ-USB FX2?

 

USB 2.0 PCB layout recommendations (as a starting point):

- Four-layer, impedance controlled boards are required.
- Impedance targets must be specified (ask your board vendor what they can achieve).
- Do not cross plane splits.
- Minimize vias.
- Maximize distance to other traces.
- Control trace widths to obtain target impedance.
- Maintain strict trace spacing control.
- Minimize stubs.
- Common mode chokes (two-wire, @100MHz should be < 300 ohms, differential impedance @100MHz should be < 8 ohms) are a USB 2.0 EMI solution.
- Refer to the USB 2.0 design guideline for solutions that work for USB2.0 FS & HS signal quality requirements.
- Proper grounding of chassis is crucial.
- Connector shell must connect to green wire ground early and well.
- Short D+/D- traces from connector to silicon.
- I/O shield must connect securely to chassis and receptacle.
- Bypass/flyback caps on VBus near connector (ESD strikes, "helper").
- Chapter 7 of USB 2.0 spec. -> www.usb.org

We would also recommend reading design guidelines here and the design guidelines document by USB-IF which you can find here.
 

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