any good way to emulate fast NOR SPI/QPI /etc FLASH with SRAM ?

[Hella_Wini22]

I'd like to play around with hardware that eitzher gets configured with ( FPGAs, FPGA SoCs etc) and/or execute code from such device (some microcontrollers, PC, CPUs etc).

To do this I'd like to use SRAM. Up to some extent, I could use onboard SRAM on FPGA, but those are quite small.

External DRAM is too slow latency-wise etc. Is there an obvious solution to this dilemma ? 🙄

[Benta]

Serial SRAM?
But you'll have to devise some kind of battery power to keep them active after programming.
Or do in-circuit programming with power on.
https://www.issi.com/US/product-serial-sram-and-serial-ram.shtml

[tom66]

I'm pretty sure you could emulate SPI ROM with another FPGA - with the bitstream stored in some external SRAM.  If you stick to SDR speed SPI flash (maybe 1-bit @ ~50MHz) then it would probably be a few hundred lines of Verilog to write a simple emulator.

Some fast microcontrollers with DMA might just about be able to do this as well.

As for an actual product, I'm not aware of one.

[Postal2]

...External DRAM is too slow latency-wise etc. Is there an obvious solution to this dilemma ? 🙄

FRAM.
https://www.infineon.com/dgdl/Infineon-FM22L16_4_MBIT_(256K_X_16)_F-RAM-DataSheet-v09_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0ec87dbd40fc
https://www.farnell.com/datasheets/2309611.pdf