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| pepijndevos_ | ZirconiumX, do you think it'd make sense to generate decoupling caps for every IC in the netlist? | 10:43 |
|---|---|---|
| ZirconiumX | pepijndevos_: Sure it would | 10:44 |
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| pepijndevos_ | What kind of person expects you to put a decoupling cap and put the vcc and gnd as far appart as possible... | 12:56 |
| ZirconiumX | pepijndevos_: Somebody who wants you to attach it to one of the pins, rather than both :P | 13:07 |
| tnt | I've seen entire boards with the cap soldered direction onto the IC pins, on top of the IC itself. | 13:08 |
| tnt | s/direction/directly/ | 13:08 |
| sorear | love me a 1-terminal capacitor | 13:23 |
| pepijndevos_ | ZirconiumX, https://imgur.com/a/PlAjAOE only thing left to do is check if the generated connections make sense and ad text. | 13:34 |
| tpb | Title: Imgur: The magic of the Internet (at imgur.com) | 13:34 |
| pepijndevos_ | Not yet sure wha exactly to write. I don't have a fancy nickname like you so it'd be pepijn de vos and ZirconiumX. I also tend to use leftover PCBs as buisiness cards... although I have plenty by now | 13:36 |
| ZirconiumX | pepijndevos_: Feel free to use my real name if you think it fits better :P | 13:37 |
| pepijndevos_ | ZirconiumX, something like this? https://imgur.com/oX93M9U | 13:45 |
| tpb | Title: Imgur: The magic of the Internet (at imgur.com) | 13:45 |
| ZirconiumX | :P | 13:45 |
| ZirconiumX | Sure | 13:45 |
| pepijndevos_ | How am I ever going to check any of this is correct... | 13:47 |
| pepijndevos_ | eeeeh, at least these decoupling caps are the worst... rerouting... | 13:50 |
| pepijndevos_ | I'm so glad this thing will only run at a few khz, I don't want to find out all my traces are too long. | 14:03 |
| ZirconiumX | It really does not matter, pepijndevos_ | 14:03 |
| ZirconiumX | Only if you're at the hundreds of MHz does it matter | 14:04 |
| pepijndevos_ | So what limits the speed of a 74xx CPU then? Pretty much all of them seem to run in the low mhz numbers. | 14:05 |
| ZirconiumX | pepijndevos_: The C74-6502 runs at 20MHz | 14:07 |
| ZirconiumX | But mostly it's propagation delay in the ICs themselves | 14:07 |
| ZirconiumX | Well, propagation delay plus switching speed | 14:08 |
| ZirconiumX | AC logic is faster than AHC logic, which is faster than HC logic | 14:09 |
| pepijndevos_ | I figured longer traces -> more inductance, capacitive loading -> bad things, but I guess not quite as bad as I thought. | 14:09 |
| ZirconiumX | AHC has shorter propagation delay, but the switching speeds of AHC and HC are about the same | 14:09 |
| pepijndevos_ | I should look up the differences between those families | 14:09 |
| pepijndevos_ | "Over 40 different logic subfamilies use this standardized part number schem" | 14:11 |
| tnt | So, what does that board do ? | 14:12 |
| pepijndevos_ | fade the LED XD | 14:13 |
| pepijndevos_ | It's more of a PoC that synthesis works, before I order a huge CPU board and find all the logic is backwards | 14:14 |
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| pepijndevos_ | How can I eecute a command *before* a script? | 19:57 |
| pepijndevos_ | If I do yosys -p something -s script -p something it does script something something | 19:57 |
| daveshah | How about -p "something; script script.ys; something" | 19:58 |
| pepijndevos_ | ah ok, lemme try | 19:59 |
| pepijndevos_ | yay! | 20:00 |
| pepijndevos_ | I can compile VHDL to 78xx!!! | 20:00 |
| pepijndevos_ | Although... would it not make sense to have paths in scripts be relative to the script location? | 20:01 |
| pepijndevos_ | I'm running a script from another directory and all the paths break | 20:02 |
| daveshah | Depends what you are doing | 20:02 |
| pepijndevos_ | I guess you want both... | 20:03 |
| daveshah | Paths relative to the current directory sounds pretty conventional (e.g. a shell script) | 20:03 |
| pepijndevos_ | yea, but often times at least in python scripts you seen funny hacks to get the path of the current script and then get the basedir from that to have script-relative paths | 20:03 |
| pepijndevos_ | Basically my problem is that ZirconiumX made this beatiful script to synthesize to 74xx, but basically iy only works if you're in a subdir of the repo itself. Is there any way to package it in a more reusable way? | 20:05 |
| daveshah | There might be some way of doing it with the Tcl API | 20:06 |
| pepijndevos_ | whoa http://www.clifford.at/yosys/cmd_tcl.html | 20:08 |
| tpb | Title: Yosys Open SYnthesis Suite :: Command Reference :: tcl (at www.clifford.at) | 20:08 |
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