SDLC for hardware design? - Page 1
Forum section: electronics / beginners

author: ziggyfish
author_rank: Regular Contributor
timestamp: July 06, 2017, 03:03:05 am
content: My question is, are there standard hardware design methodologies to follow?What I mean is in the software development world, there are standard software development methodologies, such as Waterfall, Agile, Scrum, Spiral, Iterative, etc. Is there a set of methodologies for hardware that is commonly used?

author: vealmike
author_rank: Regular Contributor
timestamp: July 06, 2017, 07:48:47 am
content: Yes, A typical procedure is:Breakfast at work.Dodge S/W agile meeting (sprint to loo.)Read datasheet.Coffee, write workbook.coffee & doughnut, draw schem.Lunch* schematic /labwork** coffee.Call from wife at 8pm reminding you to come home.Repeat daily.* On Fridays, Lunch includes beer.** On Fridays Labwork includes smoking components.

author: dmills
author_rank: Super Contributor
timestamp: July 06, 2017, 02:46:45 pm
content: Add in the need to throw some quick C or assembler together because the SW guys were to busy being agile to actually write the fiddly bits in a sane way and deal with the fact that java does not really do bitbanged peripherals or DMA (But they used it for an embedded project anyway).Also add the need to kick purchasing for 'cost optimising' your BOM.The thing that really differentiates the hardware game, is turnaround time, we hit the build button on a board and we instantly spend a few thousand $ and it takes 6 - 8 weeks for the populated prototypes to turn up. We actually do design reviews because they are cheaper then the lead time on a respin. I sometimes think we should give the software team the same constraint, it might lead to more attention to detail (Not to say thought in the design process).Actually most days lunch should feature beer.I read SDLC and mentally see a "synchronous digital line coding", as used in some telcoms stuff back in the 80s, took me a few seconds to figure out "software development life cycle".Regards, Dan.

author: BradC
author_rank: Super Contributor
timestamp: July 06, 2017, 02:57:26 pm
content: Quote from: dmills on July 06, 2017, 02:46:45 pmThanks. I could not for the life of me figure out what the "new interpretation" was. New namby-pamby claims to acronyms that nobody bothered to check before deciding that their new spin was the only one that existed. It's like when I sit in a meeting with the ESD consultants. ESD means Electro-Static Discharge not this new pink fluffy slippered "Environmentally Sustainable Design" load of twaddle. If I wanted a building that was "green" I'd have specified it be painted that colour. Instead, I want earthing and bonding thanks.

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: July 07, 2017, 02:09:48 am
content: Quote from: BradC on July 06, 2017, 02:57:26 pmAhem, it isSynchronous Data Link Controlfrom the egg heads at IBM, dating to the 1970's at least. My first job after university was writing code for what we now call fieldbus networks. The original poster and lazy thread titler should be whipped with cat5.

author: BravoV
author_rank: Super Contributor
timestamp: July 07, 2017, 03:24:11 am
content: Quote from: chickenHeadKnob on July 07, 2017, 02:09:48 amSame here, in my head, subsequently, the word SNA pop out.

author: dmills
author_rank: Super Contributor
timestamp: July 07, 2017, 11:45:57 am
content: Ah yes, I only ran across it aged about 14 with an old Z80 board that had a sync serial port that could do SDLC or IIRC HDLC.There was a specific chip in the Z80 family that provided this peripheral as I recall.Regards, Dan.

author: vealmike
author_rank: Regular Contributor
timestamp: July 07, 2017, 12:09:54 pm
content: Quote from: BradC on July 06, 2017, 02:57:26 pm

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: July 08, 2017, 02:18:01 am
content: Quote from: dmills on July 07, 2017, 11:45:57 amThe chip you are thinking of was almost certainly the infamous zilog Z8530 scc dual multi protocol serial chip. The universal swiss army knife of serial controllers, it could do it all. Including the apple desk top bus in the earliest mac "bowling balls". I know this chip well, or at least I did.