On Sat, 14 Jul 2012, William Levak wrote: I have rearranged my test program as indicated below. It does make the program shorter and the logic flow simpler. BUT, to get it to work, I have to initialize the shift register to all zeroes, and the last number register and the flip-flops to 214. I don't understand why that should be! > On Thu, 12 Jul 2012, William Levak wrote: > > INITIALIZATION: > > The flip-flops are set to 0. > > The even/odd register is set to 1. > > The last number register is set to 0. > > All the shift register positions are set to 0, except the current output > positions, which are set to 214. > > OPERATION: > > 1. The shift registers output to the flip-flops, which output to the output > register. > > 2. The chip waits for input. If the input is odd and the even/odd register > is even, continue below. Otherwise transfer the low bit of the input > register to the even/odd register, and continue waiting for input. > > 3. Exclusive or the input with the last number register. Exclusive or that > result with the current position of the shift registers. > > 4. Shift the shift registers one position, and copy the input register to > the last number register. > > 5. Go to step 1. and continue indefinitely. > > This looks like it will work, but I have not tested it yet. The advantage is > that 214 is set only once. Everything else is normal chip initialization. > > It does not explain how the even/odd register is set to one when an odd > number is accepted. There does not appear to be a good place to do it. > It isn't likely to be done when the exclusive or's are executed. That would > take very precise timing. The most likely time is when the input register is > coppied to the last number register, but that would take separate logic than > step 2. > > > firstname.lastname@example.org > SDF Public Access UNIX System - http://sdf.lonestar.org > > Message was sent through the cbm-hackers mailing list > email@example.com SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2012-07-17 05:00:05
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