Simple Clockable Decoder Chip
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From: Grant Edwards on 6 May 2008 15:51 On 2008-05-06, Eric Smith <eric(a)brouhaha.com> wrote: > Tom??s ?? h??ilidhe wrote: >> As I said elsethread, I've decided to run a 4-Bit counter into a 4- >> to-16 decoder. > > That will work fine, as long as you don't mind the decoding glitches. Or as long as he uses a gray-code counter. You can buy gray code counters, can't you? -- Grant Edwards grante Yow! I wish I was on a at Cincinnati street corner visi.com holding a clean dog!
From: Hans-Bernhard Bröker on 6 May 2008 16:35 Tom�s � h�ilidhe wrote: > People advised me about this. They said stuff like "if a bit of noise > gets onto...". The way I see it though, if I can't rely on electronics > then there's no point in me even trying to get things to work. That's rich, coming from you. You could rely on electronics alright. You would have to stop *designing* them with such total, aggressive disregard to reliability, though. It's become clear that you don't listen to any advice along those lines. That's your decision to make, sure, but that also makes all advers consequences entirely your fault. We did tell you so. > I've left my current board on overnight for three nights in a row and > it was still synchronised. How do you know it's "still" synchronized, as opposed to having rebooted and re-synchronized itself 20 times (always while you weren't looking) over? Anyway, a test like that proves diddly-squat. You have to stress it to expose flaws. Switch on a mobile phone directly on top of your device. Fire up a piezo lighter in different places. Heat it. Cool it. Drop it. Flex it. In short: let it see some abuse.
From: Eric Smith on 5 May 2008 16:33 Tomás Ó hÉilidhe <toe(a)lavabit.com> writes: > The only problem though is that I need a chip that will count to 16 > instead of 10. Does anyone know of a similar chip that will cycle thru > 16 different outputs? Sure, a CPLD. Xilinx XC9536 (5V) or XC9536XL (3.3V) come to mind.
From: Tomás Ó hÉilidhe on 5 May 2008 17:12 On May 5, 9:33 pm, Eric Smith <e...(a)brouhaha.com> wrote: > Tomás Ó hÉilidhe <t...(a)lavabit.com> writes: > > > The only problem though is that I need a chip that will count to 16 > > instead of 10. Does anyone know of a similar chip that will cycle thru > > 16 different outputs? > > Sure, a CPLD. Xilinx XC9536 (5V) or XC9536XL (3.3V) come to mind. Too expensive. As I said elsethread, I've decided to run a 4-Bit counter into a 4- to-16 decoder.
From: Eric Smith on 6 May 2008 03:10
Tomás Ó hÉilidhe wrote: > As I said elsethread, I've decided to run a 4-Bit counter into a 4- > to-16 decoder. That will work fine, as long as you don't mind the decoding glitches. |