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| stevekolb | merry christmas y'all (: | 11:29 |
|---|---|---|
| thardin | veri logmas | 11:34 |
| 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". | 11:35 |
| 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? | 11:37 |
| pepijndevos | ERROR: Unexpected character in JSON file: '-' | 11:45 |
| pepijndevos | What... | 11:45 |
| pepijndevos | Maybe it's this: "bits": [ 927150930, 960704850, 910373458, 910373458, 927150674, -647424794, -1943870848, -1943904624 ] | 11:46 |
| pepijndevos | WHAT? | 11:46 |
| daveshah | I feel like this was fixed a while ago | 11:47 |
| pepijndevos | Is it a yosys or nextpnr problem? Can try updating either... | 11:47 |
| daveshah | nextpnr | 11:47 |
| daveshah | but actually a while ago = several years | 11:48 |
| pepijndevos | uh, my nextpnr is definitely newer than that hehe | 11:48 |
| daveshah | Its been using the IdString index for a long time which should always be positive unless something is going wrong | 11:48 |
| pepijndevos | Am I somehow overflowing my idstring into negative numbers... | 11:48 |
| pepijndevos | Like... these number are too close to 32 bit for comfort. | 11:50 |
| pepijndevos | but uh... at the end of placement I "only" have 22 bits worth of idstring | 11:55 |
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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 | 12:03 |
| pepijndevos | I think the IOB don't actually have a pad port maybe, so the top level port may just be dangling. | 12:05 |
| 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?)... | 13:50 |
| 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... | 13:52 |
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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. | 18:13 |
| jfcaron | book or other* | 18:13 |
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