Hello all , there is a question about USB2.0, what happens if we ahd the following scenario : USB2.0 Hub connected to USB2.0 Host two USB Devices connected to the Hub, 2.0 and a 1.1 each one of them should work on it rated speed (i.e. 2.0 will work at high speed and the 1.1 will be at Full speed) every 1ms the 1.1 should have a start of frame paket every 125us the 2.0 should have a start of frame (microframe) how does the USB deals with every 8 microframes ? ( 8*125us=1ms !! ) --------------------------------- Do you Yahoo!? Yahoo! Search - Find what youÂ’re looking for faster. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.opencores.org/forums/usb/attachments/20040306/3741248c/attachment.htm

That's the job of the USB 2.0 hub, to sort out who gets what. Marc Reinig System Solutions -----Original Message----- From: usb-bounces@opencores.org [mailto:usb-bounces@opencores.org]On Behalf Of Mohammad AK Sent: Saturday, March 06, 2004 1:39 AM To: usb@opencores.org Subject: [usb] USB2.0 Hub Hello all , there is a question about USB2.0, what happens if we ahd the following scenario : a.. USB2.0 Hub connected to USB2.0 Host b.. two USB Devices connected to the Hub, 2.0 and a 1.1 c.. each one of them should work on it rated speed (i.e. 2.0 will work at high speed and the 1.1 will be at Full speed) d.. every 1ms the 1.1 should have a start of frame paket e.. every 125us the 2.0 should have a start of frame (microframe) how does the USB deals with every 8 microframes ? ( 8*125us=1ms !! ) ---------------------------------------------------------------------------- -- Do you Yahoo!? Yahoo! Search - Find what youre looking for faster. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.opencores.org/forums/usb/attachments/20040306/20760959/attachment.htm