> -----Original Message----- > From: Andrew Warren [SMTP:aiw@CYPRESS.COM] > Sent: Tuesday, January 21, 2003 12:59 AM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [PIC]: Interfacing a PIC to a computer via USB2.0 ? > > Michael Rigby-Jones wrote: > > > If USB2 is anything like USB1.1, then the maximum speed varies > > dramaticaly depending on cpu overhead. > > A more-accurate phrasing would be: If a particular USB2 chip has > the same architecture as a USB1.1 chip whose maximum speed > depended on CPU overhead, then that USB2 chip's maximum speed > will also depend on CPU overhead. > > At least one USB2 chip (the Cypress EZ-USB FX2 that I recommended > in my previous post) can transfer data between USB and off-chip > circuitry without any CPU intervention at all, so CPU load has no > effect on USB throughput. > > -Andy > I actualy meant the host USB in the PC rather than the slave device. Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to postmaster@bookham.com. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu