Date: Fri, 28 Jun 2002 07:51:36 +0000 From: "neil barnes" <[EMAIL PROTECTED]> Subject: Re: [LIB] L50 & USB?
>Date: Fri, 28 Jun 2002 02:26:51 -0500 >From: John Musielewicz <[EMAIL PROTECTED]> >Subject: Re: [LIB] L50 & USB? > >On Thu, 27 Jun 2002 22:50:24 -0700, you wrote: > > >Date: Fri, 28 Jun 2002 05:44:58 +0000 > >From: "neil barnes" <[EMAIL PROTECTED]> > >I suspect the timing requirements for USB are not meetable. > >Are you saying the minimum data speeds are hardwired and it only >sends and recieves at those speeds and the usb controller will stop >and give you an error if its not transmitting fast enough? That would >be a problem and make usb a really inflexible method of a data >interface. If all a person wanted was a usb-like interface with the >same pinout, so it can be used with any usb equipped laptop, and >wanted to use it as something like a programming interface speeds >become much less revelant. Plus since many micro controllers use 8 and >16 bits busses it couldn't be used with those. I guess serial will >live on. Tell you the truth, I haven't investigated in detail. There are three speeds defined for USB2 - 1.5, 12, and 480Mb/s - only one of which is capable of being handled by 16-bit pcmcia if the data is coming continuously. I guess if the device isn't capable of handling all the modes - e.g. high speed isosynchronous continuous data - then it doesn't qualify as USB. Hence, no logo, hence no parts. If you have a couple of hours to kill, the full specification is online at www.usb.org Neil _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
