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512k of Non-volatile Ram

A project log for Merlin

68000 Retro Super Computer

matthew-pearceMatthew Pearce 12/11/2021 at 08:140 Comments

My 2x SPI FRAM prototype is now up and running and memory mapped in. It now works as normal ram but retains data after power off. This will be used for firmware storage. 1 chip stores upper 8bits the second stores lower 8bits. Because I'm using an FPGA I just add as many SPI interfaces as I need so both chips run in parallel.

Hex dump of my test s-rec program after being loaded into FRAM.

The actual code - FRAM is mapped to E40000-E80000:

The dual FRAM pmod board prototype.


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