piclist-bounces@mit.edu wrote:
> With multiple drivers able to drive the bus, each driver has
> to know when it can disable itself, once it has finished
> transmitting. In order to operate the bus at the maximum
> speed, the driver needs to be disabled as soon as possible
> after the last bit has been sent.

hmmm. I recall vaguely an article I read about this:

<http://archive.chipcenter.com/embapps/emba062.htm>

not sure if this is what you are looking for, and its been 
a while since i read it, but ISTR there is a circuit 
illustrated that uses the humble 555 to automatically 
disable the driver after the last bit is sent.

Maybe it will be of some use.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist