I wanna interface an old Motorola 68000-based system with an ESP32, and I was thinking of doing that through SRAM. However I can't seem to find any SRAM that I could put between them. What other options do I have?

The idea was to stick this hypothetical dual-port SRAM straight on the 68k bus and on the ESP32's external RAM interface (QSPI/OSPI).

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    \$\begingroup\$ which 68000 system, in particular? You'd typically just use one of the communication ports that your microprocessor (or microcontroller) has. However, there are literally hundreds of different chips with an 68000 core, so it's impossible to tell what you need. Also, you'll need to tell us what data / for which purpose you're communicating; makes little sense else. \$\endgroup\$ Mar 13 '20 at 11:43
  • \$\begingroup\$ @MarcusMüller the system basically exposes the 68k bus directly, for the most part. \$\endgroup\$
    – SoniEx2
    Mar 13 '20 at 11:48
  • \$\begingroup\$ I don't know the electrical and logical structure of that; and I'd guess it'd be different for the 24 bit and 32 bit variants logically, and electrically totally depend on the individual chip. So, would it really be too much to tell us which chip or system we're talking about, in particular? You're literally asking the same as "I want to connect my x86 to my ARM for unspecified reasons", and I hope you understand why I think that's a bit too unspecific. \$\endgroup\$ Mar 13 '20 at 11:53
  • \$\begingroup\$ no, it really is a literal Motorola 68000. not a 680x0. this is more comparable to saying I have an 8086 than an x86. \$\endgroup\$
    – SoniEx2
    Mar 13 '20 at 11:55
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    \$\begingroup\$ Parallel to parallel dual port SRAM is easy to find (or used to be, when the 68000 wasn't quite so retro). To do what you're asking, the logical choice would be a small FPGA, then you get to write exactly what you are looking for. \$\endgroup\$ Mar 13 '20 at 11:59

This is a very good application for a small FPGA. If you don't need much shared memory, you can use block RAM inside the FPGA. Otherwise, a small parallel SRAM or DRAM should suffice.


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