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poleguy looking for lost tools (poleguy@mastodon.social)'s status on Monday, 19-May-2025 07:49:43 JST poleguy looking for lost tools
- Joel Michael
- ✧✦Catherine✦✧
@jpm @whitequark I effectively got coax working with dupont connectors at 800 Mbps last week.
https://mastodon.social/@poleguy/114512955425762180
Remember they call them "circuits" because the signal must travel in complete loops (circles). Interestingly the signal never travels down the wire and back in a different wire. That's a mistake due to how we draw schematics and name signals, etc. The signal actually travels from the source to the destination in both halves of the circuit at the same time.
In conversation about a month ago from mastodon.social permalink
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  poleguy (@poleguy@mastodon.social)
  
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  Attached: 1 image Major milestone in the protonpack development. The link is up and seems to not be slipping any bits! I had to change the rate to 800 Mbps (it was 1.024 Mbps, but that put the sample clock at 256 MHz which is not allowed. [DRC AVAL-29] IODELAY_RefClkFreq_alt: Invalid configuration. IDELAYE2 ... has an invalid REFCLK_FREQUENCY value (210.051000). Only values from 190-210, 290-310, or 390-410 are allowed. With a 200 MHz sample clock it stopped slipping continuously, but still had random slips.

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