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Technical questions about OSSC

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This topic contains 2 replies, has 2 voices, and was last updated by  LocoMJ 3 weeks ago.

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  • #9645

    LocoMJ
    Participant

    Hi,

    I’m a guy from Spain and I´m engineer in electronics. This year I’ve come back to the university to course a master about FPGAs. I have to make a work related with FPGA technologies and I’m thinking about some homebrew projects. Between all projects I’ve seen, I choose flashcarts from Krizz, nes2hdmi, GDEmu and OSSC.

    So, I would like to make some questions to Marqs. Here they go:

    – Why did you select an altera FPGA (EP4CE15E22) and why not another one from Xilinx for example? Are there any good reasons?
    – Where is saved the bitstream?
    – Do you use any soft core in OSSC?

    I would like this post could be a post to ask technical questions about OSCC.

    Thanks for such a great scaler 🙂
    Best regards

    #9665

    marqs
    Participant

    – Why did you select an altera FPGA (EP4CE15E22) and why not another one from Xilinx for example? Are there any good reasons?
    There was a couple reasons behind I ended up with EP4CE15E22:
    * FPGA had to be relatively cheap and hand-solderable (no BGAs)
    * During early development I used DE2-115 development board which had higher-end Cyclone IV FPGA, so it was easy transition to EP4CE15E22
    * My short experience with Xilinx’s tools (ISE) wasn’t very positive, although I have to say they didn’t suck nearly as badly as many ASIC design tools. While Quartus is not perfect either, it has worked better for me
    * Xilinx’s FPGAs seemed to be more geared towards professional design instead of hobbyist prototyping (availability, pricing etc.). Take a look e.g. how many Xilinx FPGAs Mouser offers versus Altera

    Where is saved the bitstream?
    It’s saved on a serial flash IC, which FPGA automatically reads at power-on

    Do you use any soft core in OSSC?
    Yes, it uses basic (free) version of Nios 2. If I had more time on my hands, I’d rather put LM32 or RISC-V running on the FPGA

    #9670

    LocoMJ
    Participant

    Thanks for the answers, marqs!

    In the future, I’d like to help to improve the OSSC, or even make something related with old machines and FPGAs.

    I also have the DE1 board but I’m still a newbie in this matters.

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