Post AXbQkmVhTfgwtZiSsC by xerz@fedi.xerz.one
(DIR) More posts by xerz@fedi.xerz.one
(DIR) Post #AXbIZ6R6lhWvaPULke by xerz@fedi.xerz.one
2023-07-11T23:54:22.617103Z
0 likes, 0 repeats
I have finally understood it.Process nodes USED to be named after two lengths. One is obvious to understand, gate length ‒ aka, how long the gate of a FET transistor is. The gate, btw, takes care of regulating what a transistor should do, and tends to be the smallest part of it.The other one was something that took me a bit more time to tell: the half-pitch. What this actually means is the half of how wide M1 layer interconnects are. So basically, half the length of a “wire”. I guess they always make interconnects twice as big as the absolute minimum the machinery allows for.These days, if we tried to stick by these rules, “3nm” should be more like ~10-15nm.Sources:https://www.extremetech.com/computing/296154-how-are-process-nodes-definedhttps://en.wikichip.org/wiki/technology_nodehttps://www.tel.com/museum/magazine/material/150227_report04_01/ (I just read the briefing on DuckDuckGo for half-pitch lol)https://en.wikipedia.org/wiki/3_nm_process
(DIR) Post #AXbIhSijndQ115ik9A by xerz@fedi.xerz.one
2023-07-11T23:55:57.086000Z
0 likes, 0 repeats
why can't people, just, explain these thingsis it SO HARD to say "yeah, nanometers used to be for half a wire"
(DIR) Post #AXbNkNveZSU6nLyVJQ by xerz@fedi.xerz.one
2023-07-12T00:52:27.780645Z
0 likes, 0 repeats
btw knowing this it's a lot easier to read this back: https://www.tomshardware.com/news/imecs-sub-1nm-process-node-and-transistor-roadmap-until-2036-from-nanometers-to-the-angstrom-erabasically, by 2028 we're stuck
(DIR) Post #AXbNnxDLpwxJ6ExG52 by xerz@fedi.xerz.one
2023-07-12T00:53:09.372848Z
0 likes, 0 repeats
btw knowing this it's a lot easier to read this back: https://www.tomshardware.com/news/imecs-sub-1nm-process-node-and-transistor-roadmap-until-2036-from-nanometers-to-the-angstrom-erabasically, by ~2028-2032 we're stuck
(DIR) Post #AXbNyj88XdhMbVeWh6 by xerz@fedi.xerz.one
2023-07-12T00:55:04.928772Z
0 likes, 0 repeats
(Yes, metal pitch should be interconnect pitch)
(DIR) Post #AXbOJhGEgec8t5RLns by xerz@fedi.xerz.one
2023-07-12T00:58:52.860130Z
0 likes, 0 repeats
Yes, metal pitch is the same thing as interconnect pitchalso oops I think I got my definition slightly wrong
(DIR) Post #AXbPRQZAjzPdNgY10C by xerz@fedi.xerz.one
2023-07-12T01:11:27.750714Z
0 likes, 0 repeats
@sysinshell you mean SkyWaters' 90nm process node that Google sponsors? Yeah, that was the very last process node which name matched its half-pitch
(DIR) Post #AXbPdBphLSn5A2t0TI by xerz@fedi.xerz.one
2023-07-12T01:13:37.481438Z
0 likes, 0 repeats
No more editing, only :blobcatsleep2:
(DIR) Post #AXbQkmVhTfgwtZiSsC by xerz@fedi.xerz.one
2023-07-12T01:26:10.438311Z
0 likes, 0 repeats
…I cannot sleep because I know I'm tired and I make more mistakes when tired…
(DIR) Post #AXbRNmry4mElIqjOHg by xerz@fedi.xerz.one
2023-07-12T01:33:13.590151Z
0 likes, 0 repeats
Solution: a picture is worth a thousand words https://www.iue.tuwien.ac.at/phd/rovitto/node11.html
(DIR) Post #AXbRr42LKLyewcXnwO by xerz@fedi.xerz.one
2023-07-12T01:38:30.525404Z
0 likes, 0 repeats
(Don't overthink it tho or you'll explode because reasons)
(DIR) Post #AXc8q2An4EJwu5FbVI by radarskiy@mastodon.social
2023-07-12T02:06:03Z
0 likes, 0 repeats
@xerz No.It used to be a node was named after the notable limiting geometry, i.e. whatever horizontal distance under statistical control had the smallest number. Now, it's whatever was the previous node's number divided by the the square root of two.It was never more than that. Anything else was a coincidence that was backward defined into a plan.
(DIR) Post #AXc8q37zW7fxrgwsmO by xerz@fedi.xerz.one
2023-07-12T09:37:55.109200Z
0 likes, 0 repeats
@radarskiy So, how does that differ from what I'm saying? :blobcatthink:
(DIR) Post #AXc90cfIFIVIyeZE7k by vertigo@hackers.town
2023-07-12T01:45:22Z
0 likes, 0 repeats
@xerz :blobthinkingglare: Taps the sign.Get some rest, before rest gets you!
(DIR) Post #AXc90dVl6ETHbN77tw by xerz@fedi.xerz.one
2023-07-12T09:41:32.265074Z
0 likes, 0 repeats
@vertigo don't worry, I slept and now I can explain clearly that the gate is not labeled as an interconnect, thus the half-pitch is indeed halfway :blobcatuwu:
(DIR) Post #AXcU9CMLW6F12GdRke by ignaloidas@not.acu.lt
2023-07-12T13:38:54.636Z
0 likes, 0 repeats
@xerz@fedi.xerz.one tbh right now it's more of a "how long would a gate of FET transistor have to be in a traditional process to have this density"