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? > > > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.