psram-tang-nano-9k
serv
| psram-tang-nano-9k | serv | |
|---|---|---|
| 7 | 20 | |
| 44 | 1,258 | |
| - | - | |
| 0.0 | 7.6 | |
| over 1 year ago | about 1 month ago | |
| Verilog | Verilog | |
| Apache License 2.0 | ISC License |
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psram-tang-nano-9k
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Using the OSS PsramController with both dies
See my reply here: https://github.com/zf3/psram-tang-nano-9k/issues/6
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Open HyperRAM interface for Nano 9K
I added a note about his to the controller's readme. "Quick discussion about going above 83Mhz".
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Gowin: PSRAM unusable on Tang Nano 9K: stuck in Wrapped Burst mode in read and write operations (HyperRAM on Tang Nano 4K works OK with Linear Bursts)
Another difference that I find in that W955D8MBYA data sheet compared to W955N8MBY, is that W955D8MBYA does not mention anywhere that differential signaling would be optional: but instead it marks it as required. If that is the case, then the question for Best Behavior(tm) of how to properly feed it LVDS does rise again. ( https://github.com/zf3/psram-tang-nano-9k/issues/1 )
- An open source PSRAM/HyperRAM controller for Tang Nano 9k
serv
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RISC-V support in Android just got a big setback
> Right now, most devices on the market do not support the C extension
This is not true and easily verifiable.
The C extension is defacto required, the only cores that don't support it are special purpose soft cores.
C extension in the smallest IP available core https://github.com/olofk/serv?tab=readme-ov-file
Supports M and C extensions https://github.com/YosysHQ/picorv32
Another sized optimized core with C extension support https://github.com/lowrisc/ibex
C extension in the 10 cent microcontroller https://www.wch-ic.com/products/CH32V003.html
This one should get your goat, it implements as much as it can using only compressed instructions https://github.com/gsmecher/minimax
- SERV – The SErial RISC-V CPU
- SERV: A bit-serial RISC-V core
- SERV – open-source Tiny SErial RISC-V CPU
- How many LUT for an 8 bit CPU?
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Minimax: a Compressed-First, Microcoded RISC-V CPU
In short: it works, though the implementation lacks the crystal clarity of FemtoRV32 and PicoRV32. The core is larger than SERV but has higher IPC and (very arguably) a more conventional implementation. The compressed instruction set is easier to expand into regular RV32I instructions than it is to execute directly.
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Apple to Move a Part of Its Embedded Cores to RISC-V
https://github.com/olofk/serv
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I have created a Reddit community about PicoBlaze soft processor...
As for the size advantage: this mattered more when LUTs were precious and when PicoBlaze's competition was either similarly unorthodox (J1 Forth CPU) or several times larger (MicroBlaze). Nowadays, there are very small RISC-V cores like FemtoRV32 Quark or SERV. RISC-V benefits from mainstream open-source tooling and has momentum that's hard to beat.
- Microchip to develop 12-core RISC-V processor for NASA
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RISC-V announces first new specifications of 2022 adding to 16 ratified in 2021
The RISC-V spec does allow non-trapping behavior and SeRV in particular has non-trapping behavior, which is an important part of how it can fit into 200 4-input LUTs.
https://github.com/olofk/serv#good-to-know
What are some alternatives?
uhd - The USRP™ Hardware Driver Repository
neorv32 - :rocket: A tiny, customizable and extensible MCU-class 32-bit RISC-V soft-core CPU and microcontroller-like SoC written in platform-independent VHDL.
nano4k_hdmi_tx - Open-source HDMI/DVI transmitter for the Gowin GW1NSR-powered Tang Nano 4K
riscv-cores-list - RISC-V Cores, SoC platforms and SoCs
psram-tang-nano-9k - An open source PSRAM/HyperRAM controller for Sipeed Tang Nano 9K / Gowin GW1NR-LV9QN88PC6/15 FPGA
IronOS - Open Source Soldering Iron firmware
open-fpga-verilog-tutorial - Learn how to design digital systems and synthesize them into an FPGA using only opensource tools
fusesoc - Package manager and build abstraction tool for FPGA/ASIC development
corundum - Open source FPGA-based NIC and platform for in-network compute
neo430 - :computer: A damn small msp430-compatible customizable soft-core microcontroller-like processor system written in platform-independent VHDL.
riscv - RISC-V CPU Core (RV32IM)
edalize - An abstraction library for interfacing EDA tools