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<rqou> azonenberg: https://twitter.com/azonenberg/status/978132805610700803 <-- you are cancer :P
<azonenberg> rqou: me? my lab is actually surprisingly free of carcinogens
<azonenberg> compared to others i've seen
<rqou> lol
<azonenberg> i use rohs solder, have decent ventilation
<rqou> but your presence itself can cause cancer :P :P
<azonenberg> no that would be dig and his monster xray head
<azonenberg> :p
<azonenberg> Also, that was in part a reference to an incident that occurred circa 2010
<azonenberg> when me and dig lived together
<azonenberg> we did family-style cooking for a while so somebody was making noms for all of us
<azonenberg> (5 people in the apartment)
<azonenberg> i forget who it was, but he was taking forever
<azonenberg> So one of us suggested maybe we should kill and eat the chef instead
<azonenberg> this of course led to a discussion about which of the five of us would make the best meal
<azonenberg> We had me - skinny, not much meat, and in decent shape so hard to catch
<azonenberg> There were two guys high on the list - lots of meat and not very athletic
<azonenberg> one other guy was kinda in the middle
<azonenberg> then dig was firmly in last place
<azonenberg> Plenty of stuff to eat, not a great runner, but if you actually tried to eat him you'd get ten different kinds of cancer
<azonenberg> from all the stuff he had been exposed to :p
<pie__> haaahahaha
<lain> XD
<whitequark> lol
* whitequark writes down: "digshadow is a chemical pufferfish"
<digshadow> azonenberg: haha I now know my spirit animal
<azonenberg> lool
<digshadow> the zombies will bite me and then die off
<digshadow> i'll cure the apocalypse
<azonenberg> lol
<whitequark> what if they absorb the toxins instead
<whitequark> now you've got poisonous zombies.
<azonenberg> grrreat
<azonenberg> but they'll glow in the dark
<azonenberg> easier to aim at :D
* rqou flips a table at abc
<rqou> i can't figure out how to hack in "xor on top of SOP"
<digshadow> rqou: use glue
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<pie__> * sniff glue
* pie__ sublimates
<pie__> ^ dont breathe this
<azonenberg> pie__: smoke, don't breathe this
<azonenberg> speaking of which i just got epoxy all over my artiq shirt :(
<azonenberg> picked up a bottle that had gotten all cloudy and solidified, planning to throw it out
<azonenberg> the whole outside was covered in goop
<azonenberg> Gonna have a fun time deconning the shirt tomorrow, didnt have time to do it tonight
<azonenberg> it's uncured resin so should clean off
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<azonenberg> awygle: btw, re ethernet switch
<azonenberg> digikey has the ksz9031rnx (RGMII) for $2.48 each @ qtyt 25
<azonenberg> and the DP83867 (SGMII) for $5.84 ea @ qty 25
<azonenberg> Which comes out to $62.00 / $148.50 for 25 PHYs (24 ports + one extra to hit price break)
<azonenberg> Original plan: RGMII ports only (way cheaper) but this fails if i want 24 + 4 b/c i dont have enough pins on the fpga
<azonenberg> Second plan: SGMII ports only, costs over twice as much but this may not be worth optimizing given the cost of the remainder of the system
<azonenberg> Most PHYs i've seen recommend keeping RGMII lanes quite short, 6" max / 2" ideal, and i dont think that's possible within the geometry of a 24-port switch with three line cards plus a main board
<azonenberg> SGMII seems to be more forgiving with layout since it's self-timed differential, and i can even put lvds buffers on the backplane for the last line card if i really have to
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<gruetzkopf> hmm, four-pair SGMII
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<azonenberg> gruetzkopf: I'm thinking 3-pair
<azonenberg> the PHY i have in mind does clock recovery and doesn't require TX clock
<azonenberg> But the FPGA i have can't do clock recovery on the RX clock
<azonenberg> i may be able to do oversampling, TBD
<azonenberg> have to look into that more
<azonenberg> But for the time being i wanted to make sure i had RXC just in case i needed it
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<mithro> morning!
<mithro> daveshah: ping?
<daveshah> mithro: morning!
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<kc8apf> azonenberg: RGMII (and RMII for that matter) definitely fail over 6". I've run into problems with that trying to run NCSI from one side of a chassis to another.
<kc8apf> SGMII has been run over 10ft of copper for years at Google
<kc8apf> XAUI is also very forgiving
<azonenberg_work> kc8apf: i was looking at using sgmii because of rgmii not working at long range
<azonenberg_work> my concern was sgmii *using the xilinx lvds gpio*
<azonenberg_work> rather than a GTX
<azonenberg_work> there's no equalization or preemphasis
<azonenberg_work> So your usable eye is a lot smaller
<kc8apf> RGMII has a timing issue over 6"
<azonenberg_work> well parallel busses in general fall flat after a bunch of pcb
<kc8apf> SGMII over a backplane is pretty normal for large switch chassis
<kc8apf> same with XAUI
<azonenberg_work> yeah and i bet those use real serdes
<azonenberg_work> :p
<kc8apf> not always
<azonenberg_work> xilinx's sgmii ip specifically warns that if you don't use a serdes it's limited to very short range chip to chip links on a single pcb
<kc8apf> huh. I don't remember it being _that_ sensitive
<azonenberg_work> i think this is more a general issue of using 1.25 Gbps Fmax LVDS IOs on a kintex7
<azonenberg_work> you dont have much margin
<kc8apf> I guess the receive side would have a hard time meeting LVDS after enough uncontrolled impedance
<azonenberg_work> That too
<azonenberg_work> So i'm thinking, lvds buffers on the backplane
<kc8apf> makes sense to me
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<rqou> (drama, offtopic) does anybody know what the heck is going on between @RealSexyCyborg and Vice?
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<whitequark> you don't want to know
<whitequark> it's one of those topics where the more you dig in the more insane it becomes
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<rqou> is it a repeat of what happened with Make or is it even worse?
<q3k> rqou: iiuc: 1) vice interviews naomi, promises to not dig into her pesonal life 2) vice proceeds to dig into her personal life 3) naomi is pissed
<qu1j0t3> rqou: a bit different. but her tweets seem pretty clear about where they fucked up.
<rqou> ah, i see she just posted a summary a few minutes ago
<rqou> wtf vice
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<awygle> whitequark: IOU two pull requests, cats had to go to the vet this weekend
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<rqou> lol awygle
<rqou> 🐈 🐈 🐈 🐈 🐈
<whitequark> awygle: ow.
<whitequark> what happened
<awygle> Lots of coughing (which looks horrible on cats)
<awygle> One of them appears to be allergic to this particular kind of litter
<awygle> So ultimately no big deal but somewhat alarming and disruptive
<cr1901_modern> Poor kitty :(. Plz give pets for me!
<awygle> cr1901_modern: will do. He's feeling much better now.
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<rqou> azonenberg: can you link me your pcb checklist?
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<q3k> azonenberg_work: huh, any chance I can share this along outside this channel?
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<pie_> ooooh
* pie_ saves
<azonenberg_work> q3k: sure, it's public information
<azonenberg_work> feel free to link to it or print etc
<azonenberg_work> I do ask that you not mirror it online yet as the list is continually evolving
<azonenberg_work> and i want people to get the up-to-date version
<azonenberg_work> Once i've stopped adding things to it, i'll put it on my blog and publish under CC-BY
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