Date: Sat, 15 Aug 98 05:23:00 -0000 From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow) To: aic7xxx@FreeBSD.ORG Subject: AHA2790UW has speed-limit problems ? Message-ID: <5d50b821@bilow.bilow.uu.ids.net>
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Ross Harvey wrote in a message to Mike Bilow: RH> The problem is complicated considerably by the non-intuitive RH> fact that your objective is _not_ to minimize the total RH> signal distortion, but rather you want to minimize the RH> magnitude of the largest single distortion at any sample RH> point, even if this means increasing distortion that would RH> be below the noise margin. That's why you don't want RH> reflections to superimpose, even at the price of more noise. At the risk of getting into an argument which could be as unending and controversial as whether toilet paper should feed from under or over the roll, it is worth pointing out that damping per se is sufficient to solve this problem, and the easiest way to achieve that -- regardless of what the standard says and whatever theoretical justifications may be advanced -- is simply to overterminate the bus. If there is a third terminator added in the middle of the bus somewhere, it will usually correct superimposition problems. -- Mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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