azonenberg changed the topic of #scopehal to: libscopehal, libscopeprotocols, and glscopeclient development and testing |,, | Logs:
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<azonenberg> is there a better option than this?
<lain> azonenberg: I mean, that's how I did it
<azonenberg> the sad thing is almost all of this could be very easily done in kicad with some extra features
<azonenberg> all you need to do is store propagation velocity per {layer, netclass} and per layer pair for vias
<azonenberg> have a field in the part to store package delay
<azonenberg> and then do all matching in the time domain, back-converting the skew to mm at the current layer's propagation velocity for calculating the target length
<lain> azonenberg: yep, that's what I found very frustrating about it
<azonenberg> like, is this not an obvious feature?
<azonenberg> I suspect people like me using kicad for designs of this scale are in the relative minority
<azonenberg> and don't complain enough :p
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<_whitenotifier-b> [starshipraider] azonenberg pushed 5 commits to master [+5/-0/±4]
<_whitenotifier-b> [starshipraider] azonenberg e90e8a0 - Final pinout constraints for pod FPGA
<_whitenotifier-b> [starshipraider] azonenberg 1a452f6 - Updated ipcores
<_whitenotifier-b> [starshipraider] azonenberg e353835 - Via simulations for MAXWELL stackup
<_whitenotifier-b> [starshipraider] ... and 2 more commits.
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<_whitenotifier-b> [starshipraider] einthecorgi2 forked the repository -
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<monochroma> :o
<einthecorgi2> I forked starshipraider and got started on the active probe supply. I think the only major point of discussion is having the precision regulator on the probe head or keeping them on the main board.
<monochroma> einthecorgi2: oh yeah, been meaning to ask you where you were sourcing your SoCs for corgibutt?
<einthecorgi2> Ah, directly from sunplus. I have quantity pricing, II order 100 of them for the first production run. I need to think of a better name for that board.
<monochroma> ah okay
<monochroma> and why? :< it's an awesome name ;)
<einthecorgi2> good to know :D mabye ill just keep it.
<monochroma> einthecorgi2: are you able to say what units of 100 are cost wise? looks like everyone else is selling them for ~$20 in singles
<einthecorgi2> $17.30@100
<einthecorgi2> $16.10@1000
<monochroma> ah nice
<einthecorgi2> what are you thinking about using it for?
<monochroma> general managment IC for some different projects. so far i think the microchip SoMs are winning due to being availble from digikey, but they are potatos for the price :P
<einthecorgi2> nice. I was looking for an alternative for an industrial grade application processor from the AM335x. I have just been short on CPU power in the last few applications and am looking for a good replacment. I am going to finish corgibutt anyway but I dont like the lack of peripherals, but for the price im not complaining.
<einthecorgi2> the downside to the SAMA5D27 is the processing power is pretty low. I would also consider the STM32-MP1 as that have pretty good general purpose peripherals. But it will be more expensive to integrated.
<monochroma> yeah, i wish the allwinner parts had a vendor other than alibaba
<einthecorgi2> yup. A year ago I was on the trail to making a general purpose SOM and I started with allwinner. I have a bunch of SOC sitting around. In the end I made an SOM for the A40. I considered this to be the best, but now they will only make this if you order enough for a production run I think. Olimex is doing something with the part but as good as there efforts are it has never caused a change in the supply chain for the
<einthecorgi2> parts.
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<Degi> I think precision regulator on the probe makes the most sense if it needs to be precise.
<Degi> For OP amp supply, in the PSU and then decoupling caps in the probe might suffice
<Degi> Yeah the LT3094's etc on the probe head would make more sense, then you could set the voltage on the probe head
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