I was given a project that was shelved some time ago, and the engineer that was working it is long gone.  No PIC, has a PSoC on it, being used as a USB bridge among other things.  It was routed as just signals, across the board, so no wonder it doesnt work. I assume that it should be routed as diff pair for one thing, but anyone know off the top of thier head what the route length restrictions are?  Also, the design has a 120ohm transformer in line (assume for EMI?) as well as a 27.4ohm resistor in series with the D+/D- lines.  All the designs I've seen just come from the chip direct to to the header for the USB connector.  Anyone experianced with putting USB down on a board have a comment?  It is designed to be plugged into just a USB port on a PC
 
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