wbfmtx
openarty
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wbfmtx
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what is the weirdest/craziest thing you seen FPGAs are used for?
I don't recall writing an article about it, but you can find all my work posted in this repository.
openarty
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C++ Verification Testbench Best-Practice Resources?
I have built a lot of open-source C++ tooling for design verification. You can find a lot of my C++ models posted on my Github. Example C++ models include: UART, SPI/DSPI/QSPI Flash, SD-Card (SPI-based interface), VGA Video, Ethernet MDIO, PS/2 mouse, OLED display, SDRAM and more. (I've even simulated PLLs using C++ models ...) I have also written extensively about doing so at ZipCPU.com.
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PPS detection/regeneration
The repo is the example design. It was used by software, though, that's not (currently) posted. A lot of math went into the coefficients as well--that's all in the software.
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AXI Quad SPI 3.2 Flash programming scripts
Here's the flash controller repo I use. There's a flash controller in there for SPI, Dual SPI, and Quad SPI. The Dual and Quad SPI controllers need a device specific startup script to get them into the right mode. This script should be fairly well explained by the comments. You should find at least one of these controllers that works for you. More recent versions of the controller have a Wishbone arbiter within them -- they're just not checked in the repo yet. (DSPI, QSPI). This makes it so the design fully supports two two Wishbone ports: a config port by which you can send any value and the memory mapped read port. (You can't use both at the same time.)
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Arty S7 - 2 different flash brands
You can compare my configuration file for the Spansion flash with my config file for the Micron flash to see that these are the only two hardware differences between the two
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FPGA and Simulation tools for Risc-V design
I'd then recommend Verilator for simulation testing--but only after your formal design checking is complete. You can find online C++ models of a QSPI flash, RAM, and a serial port which should be good enough to get you going here. When you are ready for more permanent storage, there's also a decent C++ model of an SD card (SPI only).
What are some alternatives?
zipcpu - A small, light weight, RISC CPU soft core
riscv-arch-test
wbicapetwo - Wishbone to ICAPE interface conversion
qspiflash - A set of Wishbone Controlled SPI Flash Controllers
autofpga - A utility for Composing FPGA designs from Peripherals
riscv-formal - RISC-V Formal Verification Framework
wbuart32 - A simple, basic, formally verified UART controller
zbasic - A bare bones, basic, ZipCPU system designed for both testing and quick integration into new systems
dbgbus - A collection of debugging busses developed and presented at zipcpu.com
videozip - A ZipCPU SoC for the Nexys Video board supporting video functionality
sdspi - SD-Card controller, using either SPI, SDIO, or eMMC interfaces
arrowzip - A ZipCPU based demonstration of the MAX1000 FPGA board