Electronics > FPGA

Being Stuck with Efinix

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AndyC_772:
Check with Digi-key, their web site says 22nd June for most variants. Just use the I4 variant and you can be up and running next week.

NorthGuy:

--- Quote from: gnuarm on January 06, 2023, 07:02:16 pm ---For a brief microsecond, I thought I could eliminate the flash and let the host board program the FPGA, but I forgot the very first thing - the daughercard has to identify itself.  There can be multiple card types.  So the FPGA has to be programmed to some default state to at least provide the control/status interface.  So that means a flash.  That's why, even a one time programmable FPGA would suit me better.

--- End quote ---

Your FPGA may have one-time programmable fuses which you can read through JTAG, then you don't need flash if your only goal is identification.

Also JTAG allows to build a chain of devices. You can add a small MCU to the chain for identification purposes.

Xilinx will generally work with any QSPI flash. They're all standard. The list of supported flashes is more like product placement thing. Even if Xilinx software refuses working with flash, you can create your own design for flash programming - it's only few hours of work, may be a day ...

Programming flash requires lots of waiting for every row, flash erase also takes time. So you cannot make it faster than the flash chip allows.

asmi:

--- Quote from: NorthGuy on June 16, 2023, 02:52:54 pm ---Xilinx will generally work with any QSPI flash. They're all standard. The list of supported flashes is more like product placement thing. Even if Xilinx software refuses working with flash, you can create your own design for flash programming - it's only few hours of work, may be a day ...

--- End quote ---
Xilinx will boot off just about any qspi flash, but if you want to do indirect programming via Vivado/Vitis, you will have to use one of supported parts. To be fair they've recently added a whole bunch of ISSI devices, so it's absolutely not a problem to procure compatible parts.

gnuarm:

--- Quote from: AndyC_772 on June 16, 2023, 11:21:32 am ---Check with Digi-key, their web site says 22nd June for most variants. Just use the I4 variant and you can be up and running next week.

--- End quote ---

Digikey is where I'm finding my info.  But I checked again and see that of the six variants in the QFP100 package, the three less expensive variants are not available until October, while the three most expensive variants claim they will have approximately 200 in a week, and the rest in October.

Still, I have an order to fill.  I don't know if I want to put my trust in a supplier.  I had far too much trouble with the last order.

glenenglish:
Just be careful of which FLASH start in 3 or 4 byte addressing mode and ensure that is compatible with your kit.
Some maintain  a mode change  only until some other instruction gets executed, some maintain the mode change until power cycle or some hardware reset cmd .

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