Date: Tue, 02 Jan 2007 21:35:00 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: freebsd@sopwith.solgatos.com Cc: freebsd-hardware@freebsd.org Subject: Re: max UART speed? Message-ID: <408.1167773700@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 02 Jan 2007 12:40:44 GMT." <200701022040.UAA03200@sopwith.solgatos.com>
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In message <200701022040.UAA03200@sopwith.solgatos.com>, Dieter writes: >http://en.wikipedia.org/wiki/UART > >lists UART speeds up to 2,764,800 bits/second. > >Does it take a special magic UART to do this? > >termios.h only goes up to 921,600 There is no theoretical upper limit, only signal integrity problems. Regular chips can only go to 115200 because of the input clock frequency they have to work with. If you run them on 8x normal clock, you get 921600, 2764800 is 24x normal clock. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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