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<azonenberg> whitequark: yeah my go-to for new projects these days is samtec q-strip
<azonenberg> Which is used (in a custom configuration) by altera as HSMC
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<kbeckmann> azonenberg: which connectors specifically do you use and where do you source them from if I may ask?
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<whitequark> so i invented a new kind of ring buffer
<Sprite_tm> whitequark: is it 8-shaped instead?
<zem> moebius buffer
<sensille> the ring is rotating and the write pointer is fixed?
<whitequark> no, i invented *that* ring buffer a while ago
<whitequark> (well, the read pointer is fixed, but it's the same thing)
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<Sprite_tm> Pff, I'm a poor ole C programmer, I have no idea what rusty mutable slices are.
<Sprite_tm> Guess I should take some time at some point to learn it, but I just never got around to it :/
<whitequark> it's literally what you described
<whitequark> the read pointer is always 0 and the entire buffer rotates on read
<whitequark> useful for dmesg-type things
<Sprite_tm> ...how's that different from a classic ringbuffer approach? The fact that reads can return contiguous memory?
<whitequark> exactly
<whitequark> usually you'd do something with mmap but what if your target doesn't have virtual memory? you do this
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<sorear> can trade off memory usage for CPU with a little bit of hysteresis
<whitequark> it only rotates on reads in the first place
<_whitenotifier-3> [whitequark/libfx2] whitequark pushed 2 commits to master [+0/-0/±2] https://git.io/fj4W1
<_whitenotifier-3> [whitequark/libfx2] whitequark 6bb8e07 - Fix some comment typos.
<_whitenotifier-3> [whitequark/libfx2] whitequark afaae3c - Incorporate even better nop optimization by 8051Enthusiast.
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<azonenberg> kbeckmann1: i normally use QTH-[030|060|090]-01-L-D-A
<azonenberg> and QSH which is the mating part, sourced from digikey
<azonenberg> somewhere around 10 USD per connector in low volume, not cheap but not FMC prices either
<emeb> They're pretty nice for high speed stuff.
<tnt> is that what the SYCZIG or whatever standard uses ?
<azonenberg> It's what HSMC uses at least, but with a custom pinout
<tnt> syzygy ...
<azonenberg> q-strip comes with either all lanes populated, or one every 3 depopulated for diff pairs
<azonenberg> HSMC has a mix of both
<azonenberg> so it's a special order variant that isnt one of the normal samtec SKUs
<azonenberg> but it will mate with a normal q-strip just fine
<emeb> Working on a prototype carrier card for a Zynq Z-Turn board that uses those.
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<azonenberg> emeb: yeah i'm using the qth-030 on starshipraider
<azonenberg> for io card modules
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<kbeckmann> thanks, 10 usd is still a bit hefty but i guess it's not too bad considering the alternatives.
<emeb> wonder how those flex connection as used on the icoboard do price & signal-integrity wise?
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<kbeckmann> yeah i think i'll be using FFC/FPC connectors instead. they seem to work fine for ~1GHz signals and 10cm cables, at least that's what i've heard. also they're used for MIPI cameras etc so it can't be that bad?
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<emeb> Can't argue with the price.
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<TD-Linux> adamgreig, lol your programmers are only $1.10/ea from osh park shipped. ordered some :)
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<emeb> link?