delay line logic

John Larkin · 2009-04-15T20:33:45+00:00

One now near-forgotten logic design paradigm is "delay-line logic",where tapped delay lines were used to sequence digital logic things.DEC did a lot of this in the PDP-8 days, and early DRAM controllerstended to work this way. I suppose passive LC delay lines were cheaperthan flipflops and such, in those distant days.But I just came across a design done in the early 1990's that was amix of CPLDs and delay lines. I guess some old-timer did it. The worstexample was one Atmel CPLD with ***five*** delay lines hooked to it.Several others have two or three.The delay lines are "MSX1000SA050" on the schematic. One input, 5outputs at 10 ns delay steps, +5 and ground, so it may be one of thoseTTL-buffered-LC things. I don't know if people were doing silicondelay lines ca 1990.Does this part number sound familiar to anybody? I've googled andcan't find the manufacturer.John

delay line logic

Apr 15, 2009 64 Replies

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Bob Larter 17 years ago

I love that show. It reminds me of many academics I've known.

W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------

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JosephKK 17 years ago

out

If that is the best you got; you could know very much more about the language if you take the time. .

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Rich Grise 17 years ago

Well, by the time I got to kindergarten, I was already reading at about a 2nd-grade level; I was bored shitless. ("I thought they were supposed to _teach_ us stuff, not sit and make paper dolls all day!") I think that if it had been today, they'd have diagnosed me with ADHD and started drugging me.

Thanks, Rich

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Bob Larter 17 years ago

Pretty similar to me. My mother is a former English teacher who started me well before I was old enough to go to school, so my reading skills were way ahead of other kids from kindergarten through to high school.

W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------

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JosephKK 17 years ago

out

(age

it,

about

supposed to

drugging

Both of you must have hit school after i did. Being able to read was common / normal entering first grade when i was there. .

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