clifford changed the topic of #yosys to: Yosys Open SYnthesis Suite: http://www.clifford.at/yosys/ -- Channel Logs: https://irclog.whitequark.org/yosys
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<stevekolb> merry christmas y'all (:
<thardin> veri logmas
<stevekolb> Not sure if this is a yosys or rather a nextpnr topic but I am currently tinkering with my first gateware design and am looking for ways to understand what parts of my rtl code are responsible for which portions of logic/device utilization and max frequency / "max delay posedge".
<stevekolb> Is there something sort of like a profiler that I can use to understand how I filled up my fpga, and how I broke the timing budgets?
<pepijndevos> ERROR: Unexpected character in JSON file: '-'
<pepijndevos> What...
<pepijndevos> Maybe it's this: "bits": [ 927150930, 960704850, 910373458, 910373458, 927150674, -647424794, -1943870848, -1943904624 ]
<pepijndevos> WHAT?
<daveshah> I feel like this was fixed a while ago
<pepijndevos> Is it a yosys or nextpnr problem? Can try updating either...
<daveshah> nextpnr
<daveshah> but actually a while ago = several years
<pepijndevos> uh, my nextpnr is definitely newer than that hehe
<daveshah> Its been using the IdString index for a long time which should always be positive unless something is going wrong
<pepijndevos> Am I somehow overflowing my idstring into negative numbers...
<pepijndevos> Like... these number are too close to 32 bit for comfort.
<pepijndevos> but uh... at the end of placement I "only" have 22 bits worth of idstring
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<pepijndevos> daveshah, I have suspicions towards this code, but no clue what's wrong exactly. https://github.com/pepijndevos/nextpnr/blob/gowin2/gowin/pack.cc#L213
<pepijndevos> I think the IOB don't actually have a pad port maybe, so the top level port may just be dangling.
<stevekolb> So I have started poking the json output of yosys a bit, counting cells occupied by modules/wires/registers. Rough stats show some unproportionate cell allocations for stuff I expected to be trivial (like 10k cells for one 32bit output reg?)...
<stevekolb> Not sure how meaningful my data science here is tho, given that I don't really understand the semantics of that json data yet...
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<jfcaron> Is there a good book other learning resource for learning to use the ice40? I got an icoBoard, but these scattered blog posts and youtube videos are not getting me very far. I can cargo-cult the LED blink demos but I think I need more thorough materials.
<jfcaron> book or other*
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