Electronics > FPGA

News on tools for Gowin FPGA.

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technix:
The last time I tried, I have found out that Digilent JTAG-SMT modules for Xilinx FPGAs, at least my reverse engineered clones of JTAG-SMT1 and JTAG-SMT2, are recognized by Gowin software and can at least detect a JTAG chain.

This may be some helpful news for you trying Gowin platform. I will keep you posted as I have ordered parts for a test PCB with Gowin GW1NSR-4C SoC with a Gowin Little Bee FPGA, 8MB PSRAM and a Cortex-M3 hard CPU core on it, and the onboard USB interface is based on my JTAG-SMT1 clone.

technix:

--- Quote from: blueskull on April 28, 2021, 05:47:59 am ---There is no surprise as both of them are FT2232H-based. Also Lattice and Pango ones are FT2232H-based. Altera is the only exception.

FYI, for a slower but cheaper implementation, check out Lichee Tang Nano's implementation, which uses a CH552 programmed to mimic FT2232H, but the baud rate is only up to 2.5Mbps. Of course, since it is USB 1.1, FTDI can easily cook up a patch driver to kill off this device from being used with FTDI drivers, so there is a risk associated.

That being said, if you do not need to use GAO or any debug features, and you only need a flash/sram writer, there are other open source projects based on CH552.

--- End quote ---
At least for that specific target chip, I need something that can work with both Gowin and OpenOCD. Gowin for programming the FPGA, and OpenOCD for debugging ARM code.

JTAG-SMT1 and JTAG-SMT2 has four Output Enable lines which was not set correctly for older versions of Gowin. The news is that current versions of Gowin tools do set them correctly.

And speaking of JTAG-SMT2, that is based on the single-channel FT232H, although that is similar enough with FT2232H channel A.

dmendesf:
Where you got your GW1NSR-4C FPGA? This is a dream chip...

ali_asadzadeh:

--- Quote ---Contact Sipeed (the maker of Lichee Tang series and Lichee Pi series and Mai series of IoT boards), they distribute that chip.
--- End quote ---
Any Price info?

technix:

--- Quote from: dmendesf on April 28, 2021, 06:01:40 am ---Where you got your GW1NSR-4C FPGA? This is a dream chip...

--- End quote ---
I got them as free samples.

I told them I have an open source project idea with it. They said show me your schematics. I said https://github.com/SushiBits/Gowinduino and voilà three sample chips.

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