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