Hi everyone, i have enveloped this mail with the schematic of my usb transcieve connection. The chip i select is PDIUSB11A .Can anyone have a glance to it and tell me his opinion? I would like to run my usb device in full speed mode, should i pull up D+ or D- ? Am i wrong in my schematic ? Thank you very much for your consideration. Regards, TOM _________________________________________________________________ MSN ¬Ûï´£¨Ñ±z³Ì²³æªº¤è¦¡¤À¨É¨Ã¦C¦L±zªº¬Û¤ù¡A½Ð²¾¦Ü : http://photos.msn.com.hk/support/worldwide.aspx -------------- next part -------------- A non-text attachment was scrubbed... Name: usb_connection.jpg Type: image/pjpeg Size: 61765 bytes Desc: not available Url : http://www.opencores.org/forums/usb/attachments/20040407/d0f30577/usb_connection-0001.bin

A full speed device pulls up D+. However, it must either be sourced by Vusb
or gated by Vusb since the spec doesn't allow you to source current on the
bus in the absence of Vusb. I would also bypass the Vusb with a 0.1uF cap
in addition to the 1.5uF cap.

Marc Reinig
System Solutions