Hi
I need more SRAM on the SEA and don’t have enough pins so I’ll need to use SPI. I need the equivalent of 150ns access time so I’ll need something pretty quick if it’s SPI but I’m struggling to work out how fast. I found 108Mhz QSPI FRAM pretty cheap ($10) but I’d like to be sure it’s quick enough, and also I’m keen to understand how to calculate the access time for a byte from SPI/QSPI!
Hope someone can help.
This information should be available in the specification for SPI PSRAM.
There ingredients are - I’d need to calculate that - which I guess I can do, but would be great if someone has experience of it and can advise. Whilst 108Mhz sounds great, bytes and commands obviously have to be serialized both ways, so assuming no delay (not realistic) then that’s possibly 108Mhz/32 or more (SPI, not QSPI). Never used one before so was just looking for anyone with experience. I haven’t seen per byte access times on the data sheets I’ve looked at - that would be lovely.