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Tommy ÞThis is so much fun <a href="https://tommythorn.github.io/tt08-maxbw/" rel="nofollow noopener" translate="no" target="_blank">https://tommythorn.github.io/tt08-maxbw/</a> <a href="https://chaos.social/tags/ASIC" class="mention hashtag" rel="nofollow noopener" target="_blank">#ASIC</a> <a href="https://chaos.social/tags/tinytapeout" class="mention hashtag" rel="nofollow noopener" target="_blank">#tinytapeout</a> <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a> <a href="https://chaos.social/tags/VLSI" class="mention hashtag" rel="nofollow noopener" target="_blank">#VLSI</a> <a href="https://chaos.social/tags/tokenflow" class="mention hashtag" rel="nofollow noopener" target="_blank">#tokenflow</a>

Tommy ÞManaged to push my first (barely) nontrivial async circuit through <a href="https://chaos.social/tags/TinyTapeout" class="mention hashtag" rel="nofollow noopener" target="_blank">#TinyTapeout</a> (bundled data 4-phase). Alas, I totally failed delay matching so I’m just using ridiculously large delays. I still have a couple of hours to improve it. <a href="https://chaos.social/tags/asic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asic</a> <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a>

Tommy ÞAnyone here has an interest in or experience with <a href="https://chaos.social/tags/async" class="mention hashtag" rel="nofollow noopener" target="_blank">#async</a> <a href="https://chaos.social/tags/logic" class="mention hashtag" rel="nofollow noopener" target="_blank">#logic</a>, like <a href="https://chaos.social/tags/mousetrap" class="mention hashtag" rel="nofollow noopener" target="_blank">#mousetrap</a> or Click?<a href="https://chaos.social/tags/VLSI" class="mention hashtag" rel="nofollow noopener" target="_blank">#VLSI</a> <a href="https://chaos.social/tags/AsynchrousLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsynchrousLogic</a> <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a> <a href="https://chaos.social/tags/ASIC" class="mention hashtag" rel="nofollow noopener" target="_blank">#ASIC</a>

Tommy ÞAHHHH! I finally got a ring oscillator working on <a href="https://chaos.social/tags/ECP5" class="mention hashtag" rel="nofollow noopener" target="_blank">#ECP5</a> with the <a href="https://chaos.social/tags/Yosys" class="mention hashtag" rel="nofollow noopener" target="_blank">#Yosys</a> / <a href="https://chaos.social/tags/Nextpnr" class="mention hashtag" rel="nofollow noopener" target="_blank">#Nextpnr</a> tool chain (I’m not complaining, I’m happy they exist and I’m doing something unorthodox)You have to instantiate the inverters as LUTs directly *AND* you have to build the latest tools yourself (I had two different binaries segfault on the design).<a href="https://github.com/YosysHQ/nextpnr/issues/1194#issuecomment-1684724413" rel="nofollow noopener" target="_blank">https://github.com/YosysHQ/nextpnr/issues/1194#issuecomment-1684724413</a> <a href="https://chaos.social/tags/verilog" class="mention hashtag" rel="nofollow noopener" target="_blank">#verilog</a> <a href="https://chaos.social/tags/fpga" class="mention hashtag" rel="nofollow noopener" target="_blank">#fpga</a> <a href="https://chaos.social/tags/ncl" class="mention hashtag" rel="nofollow noopener" target="_blank">#ncl</a> <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a>

Tommy Þ<a href="https://mastodon.gamedev.place/@reduz" class="u-url mention" rel="nofollow noopener" target="_blank">@reduz</a> Alas “technical” covers cosmic areas, but I miss the usenet communities of yore, like comp.arch and comp.arch.fpga.Always ready to discuss anything related to <a href="https://chaos.social/tags/microprocessorarchitecture" class="mention hashtag" rel="nofollow noopener" target="_blank">#microprocessorarchitecture</a>, <a href="https://chaos.social/tags/microprocessorimplementation" class="mention hashtag" rel="nofollow noopener" target="_blank">#microprocessorimplementation</a>, <a href="https://chaos.social/tags/digitallogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#digitallogic</a>, and especially “paths not followed”, like <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a>, <a href="https://chaos.social/tags/blockstructureISAs" class="mention hashtag" rel="nofollow noopener" target="_blank">#blockstructureISAs</a>, etc

Tommy ÞAll the conference papers I want to read are pay-walled at $33 per article (thanks IEEE). That actually gets expensive quickly. Frustrating. <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a> <a href="https://chaos.social/tags/VLSI" class="mention hashtag" rel="nofollow noopener" target="_blank">#VLSI</a> <a href="https://chaos.social/tags/ASIC" class="mention hashtag" rel="nofollow noopener" target="_blank">#ASIC</a> <a href="https://chaos.social/tags/Circuits" class="mention hashtag" rel="nofollow noopener" target="_blank">#Circuits</a>

Tommy ÞWatching a slightly older talk on <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a>. Delightful and had a few things I hadn't heard before: <a href="https://youtu.be/Di-H333l1rQ" rel="nofollow noopener" target="_blank">https://youtu.be/Di-H333l1rQ</a>

Tommy ÞFun! I wonder if Valve's Portal took inspiration from the Real World Potato computer (300 kHz @ 0.75 V) described in <a href="https://www.researchgate.net/publication/280493949_25_Years_Ago_The_First_Asynchronous_Microprocessor" rel="nofollow noopener" target="_blank">https://www.researchgate.net/publication/280493949_25_Years_Ago_The_First_Asynchronous_Microprocessor</a> KW: <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a> <a href="https://chaos.social/tags/VLSI" class="mention hashtag" rel="nofollow noopener" target="_blank">#VLSI</a>

Tommy ÞReading "The Design of an Asynchronous MIPS R3000 Microprocessor" (<a href="https://www.researchgate.net/publication/2448388_The_Design_of_an_Asynchronous_MIPS_R3000_Microprocessor" rel="nofollow noopener" target="_blank">https://www.researchgate.net/publication/2448388_The_Design_of_an_Asynchronous_MIPS_R3000_Microprocessor</a>), a very different way to implement the classsic <a href="https://chaos.social/tags/RISC" class="mention hashtag" rel="nofollow noopener" target="_blank">#RISC</a> <a href="https://chaos.social/tags/pipeline" class="mention hashtag" rel="nofollow noopener" target="_blank">#pipeline</a> KW: <a href="https://chaos.social/tags/AsyncLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#AsyncLogic</a> <a href="https://chaos.social/tags/Architecture" class="mention hashtag" rel="nofollow noopener" target="_blank">#Architecture</a> <a href="https://chaos.social/tags/processor" class="mention hashtag" rel="nofollow noopener" target="_blank">#processor</a>

Tommy Þ<a href="https://chaos.social/@matthewvenn" class="u-url mention" rel="nofollow noopener" target="_blank">@matthewvenn</a> "Efabless want all the submissions to run a top level timing check" So does this mean that anything that's not synchronous logic is out? Clearly async or domino say will not pass any of the timing tool they have. That's a pretty unfortunate restriction. <a href="https://chaos.social/tags/tinytapeout" class="mention hashtag" rel="nofollow noopener" target="_blank">#tinytapeout</a> <a href="https://chaos.social/tags/asic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asic</a> <a href="https://chaos.social/tags/skywater" class="mention hashtag" rel="nofollow noopener" target="_blank">#skywater</a> <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a> <a href="https://chaos.social/tags/dominologic" class="mention hashtag" rel="nofollow noopener" target="_blank">#dominologic</a> <a href="https://chaos.social/tags/digitaldesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#digitaldesign</a> <a href="https://chaos.social/tags/efabless" class="mention hashtag" rel="nofollow noopener" target="_blank">#efabless</a>

Tommy ÞFor <a href="https://chaos.social/tags/tinytapeout" class="mention hashtag" rel="nofollow noopener" target="_blank">#tinytapeout</a> I want to produce some <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a> designs, the challenge being the limited size and IO of course. My initial thought would be something as trivial a ripple-carry adder loop, to meassure the avg. add/s, Interfacing with <a href="https://chaos.social/tags/synchronouslogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#synchronouslogic</a> to get data on and off the scan chain. I can do <a href="https://chaos.social/tags/NCL" class="mention hashtag" rel="nofollow noopener" target="_blank">#NCL</a> easily enough but the higher performance alternatives all require custom cell and/or tricky delays for the <a href="https://chaos.social/tags/QDI" class="mention hashtag" rel="nofollow noopener" target="_blank">#QDI</a> <a href="https://chaos.social/tags/bundleddata" class="mention hashtag" rel="nofollow noopener" target="_blank">#bundleddata</a>. Anyone else working on something like this?

Tommy ÞShoot, I should probably have decorated with <a href="https://chaos.social/tags/asynclogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#asynclogic</a> <a href="https://chaos.social/tags/tinytapeout" class="mention hashtag" rel="nofollow noopener" target="_blank">#tinytapeout</a> <a href="https://chaos.social/tags/vlsi" class="mention hashtag" rel="nofollow noopener" target="_blank">#vlsi</a> <a href="https://chaos.social/tags/verilog" class="mention hashtag" rel="nofollow noopener" target="_blank">#verilog</a> etc. Oh well, I'm new here. (I wonder if <a href="https://fosstodon.org/@mrg" class="u-url mention" rel="nofollow noopener" target="_blank">@mrg</a> have made progress on async support in OpenRAM)

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