March R. Smith - University of St Thomas - Minnesota ENGR 330: Today’s Class SuppliesSupplies –Motherboard –Bag of stuff –Wires ProjectProject BussesBusses Processor I/O operationsProcessor I/O operations

March R. Smith - University of St Thomas - Minnesota Project Phase 1: ProposalPhase 1: Proposal –Most have done this – finish this weekend! Phase 2: Research/ReportPhase 2: Research/Report –Start now – find datasheets on the Internet –Wikipedia may be a starting point, but DON’T RELY ON IT Phase 3: Draft ReportPhase 3: Draft Report –Finished in late November Phase 4: Peer ReviewPhase 4: Peer Review –Review another team’s report, note errors, make corrections Phase 5: FinalPhase 5: Final –Apply appropriate changes, produce & give presentation

March R. Smith - University of St Thomas - Minnesota Project Dates –Monday 11/12 – have your processor proposal in Just about everyone is set right nowJust about everyone is set right now –Late November – draft paper deadline Last possible date: November 23Last possible date: November 23 Question: should it be before Thanksgiving?Question: should it be before Thanksgiving? –December 3 – Peer review of another team’s paper You read and comment on another team’s reportYou read and comment on another team’s report They comment on yoursThey comment on yours –December 10 & 12 – Final Reports and Presentations

March R. Smith - University of St Thomas - Minnesota How does the CPU talk other things? How does it talk to RAM?How does it talk to RAM? How does it talk to I/O devices?How does it talk to I/O devices? What is the interface?What is the interface? The bus gameThe bus game –Metronome (s) –Call when ready (as)

March R. Smith - University of St Thomas - Minnesota Internal vs External Busses Internal bus of the LC-3Internal bus of the LC-3 –Data? –Addresses? –Control signals? External bussesExternal busses Serial vs ParallelSerial vs Parallel

March R. Smith - University of St Thomas - Minnesota Computer design questions How could a processor do I/O?How could a processor do I/O? –What does it mean to “do I/O?” How to do it without I/O instructions?How to do it without I/O instructions? What about the speed differences?What about the speed differences? How do we free the processor from busy wait?How do we free the processor from busy wait? Must the CPU move every data byte itself?Must the CPU move every data byte itself?

March R. Smith - University of St Thomas - Minnesota That’s it. Questions?Questions? Creative Commons License This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License. To view a copy of this license, visit or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.