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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<develonepi3> Hello I have a toplevel_pll.v for iCE40HX8K-EVB. This board has 100MHz clock. is there a way to find what desired freq was used?
<develonepi3> Hello All; This is "https://github.com/develone/VexRiscv/blob/master/Murax-Catboard/toplevel_pll.v" file in question. I have HX8K which has a clock 100MHz.
<Twix> you can just calculate the frequency the PLL will output
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<develonepi3> Twix: icepll -i 100 -o 12 Error: PLL output frequency 12.000 MHz is outside range 16 MHz - 275 MHz! See "https://github.com/develone/VexRiscv/blob/master/Murax-Catboard/pllcalc.xls"
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<Twix> ah now i understand, you are asking how to get the 12 MHz from 100 MHz input?
<Twix> one way would be to use the PLL generate a higher frequency(e.g. 24 MHz) and divide it inside your logic. You could use a counter for that
<develonepi3> Twix I have a toplevel_pll.v which has the DIVR, DIVF, and DIVQ. "https://github.com/develone/VexRiscv/blob/master/Murax-Catboard/toplevel_pll.v"
<develonepi3> Twix This is for iCE40/iCE40HX8K-EVB which has 100MHz like the my target HX8K.
<tnt> ... don't divide in logic unless you have no choice.
<tnt> here you do : You can use the post divide by 2 of the PLL.
<tnt> See `GENCLK_HALF`
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<develonepi3> tnt The file already has GENCLK.
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<develonepi3> tnt & Twix this is to run Murax Risc-V on a HX8K written scala.
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<lambda> another question about SV types: is this expected behaviour? typedefs apply to the entire scope they are in, no matter their position, yet parsing requires the type to be defined as *anything* before it's used as an identifier https://bpa.st/33YQ
<tpb> Title: View paste 33YQ (at bpa.st)
<lambda> if the first line is removed, it doesn't parse anymore, even though that type signature is never actually used
<gatecat> I do remember reading they must be defined before they are used. I suspect t3 should be 8bit but it's been over a year since I looked
<lambda> alright, LRM reading time it is
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