Re: [Video] A simple 16MHz hack for my STE: why memory access is so important.
Posted: Sat Jan 15, 2022 12:22 am
The 536 is *lightly faster than my DFB1 as I run at 50 and Stephen runs at 100 (the RAM's double clocked over the CPU) which (I think) means he can respond to AS half a clock faster than me. He has to space his SDRAM commands out though, on account of minimum times. Something I don't have to worry about at 50.exxos wrote: ↑Fri Jan 14, 2022 11:48 pmMust be doable though as the TFxxx series use 50Mhz CPU and SDRAM I think ?, not sure if that had waitstates, but that can keep up I think..Badwolf wrote: ↑Fri Jan 14, 2022 11:39 pm Crikey! 10ns is a big ask. This is the RAM I'm targeting: https://www.farnell.com/datasheets/2622019.pdf
Net result is I get about 24MB/s reading and he gets about 30, IIRC. Theoretical limit for the 030 at 50MHz is around 45MB/s. I don't think either of us hit that.
I don't know how the 1260 performs -- nor if it uses the same style of SDRAM that Stephen has on the 536 and I have on the DFB1. That would presumably have a much higher theoretical limit, though.
CT60 goes a lot quicker, but I think that's using DDR. Not sure how a single access clocks, mind.
BW