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   Lucie / minute (mntmn@mastodon.social)'s status on Thursday, 11-Dec-2025 00:03:48 JST Lucie / minute

   i'm looking for low-cost options to debug MIPI-DSI signals, a device that receives DSI and that i can poke for information (incl video timing and errors) about the video stream, either in place of a display or interposed. any ideas/experiences? thinking about crosslink NX dev boards (but never worked with crosslink) all the way to 1ghz-rate scope (or would i need 2ghz for ~800mhz dsi HS rate?) or LA and decoding on computer.

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Thursday, 11-Dec-2025 00:03:45 JST ✧✦Catherine✦✧

     in reply to

     • Andrew Zonenberg
     • Kraftwerk-Das Model Collapse

     @dngrs @mntmn 1.6 GHz bandwidth is a minimum per Nyquist, sampling rate generally has to be significantly higher than that (I'd expect 5-10 GHz to work?), plus you need a special probe just to capture the signals (cc @azonenberg); I would expect anything involving Crosslink to take a _massive_ amount of time

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     Kraftwerk-Das Model Collapse (dngrs@chaos.social)'s status on Thursday, 11-Dec-2025 00:03:47 JST Kraftwerk-Das Model Collapse

     in reply to

     • ✧✦Catherine✦✧

     @mntmn hmm, @whitequark any ideas?

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Thursday, 11-Dec-2025 00:11:34 JST ✧✦Catherine✦✧

     in reply to

     • Andrew Zonenberg
     • Kraftwerk-Das Model Collapse

     @azonenberg @dngrs @mntmn oh you're right, I'm not really awake yet, oops

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     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Thursday, 11-Dec-2025 00:11:36 JST Andrew Zonenberg

     in reply to

     • ✧✦Catherine✦✧
     • Kraftwerk-Das Model Collapse

     @whitequark @dngrs @mntmn 800 Mbps data rate is 400 MHz Nyquist bandwidth / 800 Msps minimum. I can't remember if the MIPI clock is half rate or full rate (which would require double the BW).

     You can actually run close to Nyquist with upsampling if you are just doing data recovery not SI work. I've decoded 25G NRZ with a 40 Gsps scope before, and on the extreme case 1.25 Gbps 1000Base-X (625 MHz Nyquist bandwidth) with a 2 Gsps scope.

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     Lucie / minute (mntmn@mastodon.social)'s status on Thursday, 11-Dec-2025 01:30:40 JST Lucie / minute

     in reply to

     • Andrew Zonenberg
     • ✧✦Catherine✦✧
     • Kraftwerk-Das Model Collapse

     @whitequark @dngrs @azonenberg thx especially for the crosslink judgement, that's kind of what i feared yeah