From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2007-11-07 13:05:59
Ah, you're right. I neglected to include the CLK line. Let's change two
lines to 'two pair'. ;-)
For clock collissions, I'm unsure and will think about this today.
-jbev
On Tue, 6 Nov 2007, Jim Brain wrote:
> David Wood wrote:
> > Network: Half-duplex packet-based bus network (think: Model railroad DCC
> > system). Collision detection is done by using both serial ports linked
> > together: When you transmit a byte, you also recieve it. Transmit, then
> > check to see if what yout ransmitted is what was seen on the line. If not,
> > there was a collission with another node's data, and you need to retransmit
> > your data after a short/random delay. This should be done after each byte
> > transmitted of course, so you dont flood the line with a packet full of
> > collissions.
> >
> >
> I believe the CIA serial ports are synchronous, so you need the SP1 and
> and CNT signal, which makes this harder, as CNT could get mangled if two
> machines try to transmit at the same time. On the plus side, CNT and
> SP are open drain, so they wouldn't fight each other on the network. It
> seems a token passing or some other collision avoidance scheme is
> needed. The 64 PRG speaks of using the SP/CNT pins in a network, but
> master/slave.
>
> Maybe have a common ATN wire like the IEC protocol? But, how to use it?
>
>
>
>
>
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>
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