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USB Low-Full-High Speed Peripherals

Anonymous
Not applicable
        hi all   
I have cy7c68013a chip and I want to make PCB for it in two layer but in PCB Layout Recommendations for this chip said that Four layer impedance controlled boards are required to maintain signal quality.   
Please, if any one know any thing about this , answer me quickly .   
   
   
thanks   
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Anonymous
Not applicable
        Hi,   
I made a 4-layer PCB with the cy7c68013a chip and it was fully functionnal. I did not make any impedance control and it worked very well. I am currently designing a 2-layer PCB with the same chip and it should work fine. I suggest to minimize the length of the differential traces to the usb connector. The lengths should be equal. You can also try to respect the impedances (Z0 and Zdiff) of the USB traces, but I didn't take care of this and it work fine. The rest of your PCB will work at 48MHz maximum, which is not fast enough to consider impedance control (In my opinion).   
   
Max   
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