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| pepijndevos[m] | <something relevant to not seem like spamming the channel for testing matrix> | 12:21 |
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| janrinze | hmm... i had expected ecp5 to be faster than hx8k. The TTA design does 100 MHz on HX8K but 'only' 78MHz on ecp5 (LFE5UM5G-85F-8BG381) evaluation board? | 15:51 |
| daveshah | Possibly hit an unlucky case somewhere | 15:51 |
| daveshah | picorv32 is at least 2x faster on ECP5-5G than HX8K | 15:51 |
| janrinze | Not sure if I did everything correctly but I expected ecp5 to be significantly faster than hx8k. | 15:51 |
| janrinze | daveshah: could it be BRAM speed? | 15:52 |
| daveshah | BRAM is slow in the non-5G ECP5s but fast on the 5G ECP5 | 15:52 |
| janrinze | the yosys command is : synth_ecp5 -noccu2 -nomux -nodram | 15:53 |
| daveshah | That's not right | 15:53 |
| daveshah | You want just `synth_ecp5` these days | 15:53 |
| daveshah | The nextpnr command would determine device type and speed grade | 15:53 |
| janrinze | Ah. i see, just using synth_ecp5 yields .... (drum roll... ) 185.39 MHz ! yay! | 15:56 |
| tnt | lol | 15:56 |
| janrinze | Nice to know it was just pebcac :-) | 15:58 |
| janrinze | daveshah: I was very curious because I want to know if buying the evaluation board is actually going to get me that bit extra that I am looking for both in speed and size. | 16:02 |
| daveshah | Yes, it certainly should | 16:02 |
| daveshah | Incidentally, do you have --um5g-85k in your nextpnr string? Otherwise there is room to go further | 16:03 |
| janrinze | nextpnr-ecp5 --timing-allow-fail --speed 8 --freq 100 --json build/top.json --lpf ulx3s/top.lpf --um5g-85k --textcfg build/top.config | 16:03 |
| daveshah | Looks good | 16:03 |
| janrinze | :-D thanks | 16:03 |
| janrinze | thanks to the extensive feedback from the nextpnr-ecp5 when no arguments are given. | 16:03 |
| janrinze | daveshah: with in mind 1.8 times faster, 11 times more LUTs and 29 times more BRAM.. no brainer :-D | 16:10 |
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| janrinze | ULX3s has a speed grade 6 which makes it around 10% faster than hx8k. | 16:20 |
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| tnt | janrinze: what's build/top.config for btw ? | 17:30 |
| tnt | oh that's the output file nm | 17:32 |
| daveshah | Yeah like a higher level config format than asc | 17:32 |
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