From: Shalom.Bresticker@motorola.com
Date: Thu Oct 11 2001 - 03:46:31 PDT
Precedence: bulk
<p>>Number: 47
>Category: errata
>Originator: Shalom.Bresticker@motorola.com
>Description:
The descriptions of tri0 and tri1 in section 3.7.4 are inaccurate and misleading.
The accurate sentence (for tri1) is "When no driver drives a tri1 net, its value is 1."
Inaccurate are
"The tri0 and tri1 nets model nets with resistive pulldown and resistive pullup devices on them," and "A tri1 net is
equivalent to a wire net with a continuous 1 value of pull strength driving it."
The difference occurs if the net is being driven by a driver weaker than pull.
In a true pullup net, the pullup will override the driver. In a tri1, the weak driver will succeed.
Similarly, if a true pullup net is also driven by a pull0
strength, there will be contention, but not in a tri1 net.
Note that the second inaccurate sentence does not appear in 1364-1995.
At the very least, the second inaccurate sentence, which was
added in 1364-2001 should be deleted.
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