You didn't say if it's a full speed, high speed or low speed USB. Differential tracks are important only at high speed, maybe if are very long routes on full speed too. I'm talking about routing on least two layer PCB with ground plane, not wiring with wire wrapping or soldering wires (even those are ok for short connections). I'm wondering how many has measured 480Mbit/sec on an USB connection ? Vasile On 1/31/07, alan smith wrote: > 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 > > --------------------------------- > No need to miss a message. Get email on-the-go > with Yahoo! Mail for Mobile. Get started. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist