On 2013-06-29, at 08:38, Ruud@Baltissen.org wrote: >> Has anyone of you had some experience .... > > Not at all, but I put one of my two brain cells in overgear. :-D > If the _RFSH line was meant to be connected to GND or +5V only, the > designers could have done it inside the IC. IMHO it is meant to > tell the IC it can do a refresh without fear that it will be > accessed during that moment. The datasheet says about three "refresh modes". It also says "The self-refresh mode provides transparent refresh without system overhead". I hoped it to mean that the system doesn't have to do any dynamic stuff around the chip. > If I was using it in a VIC-20 as RAM > expansion, then I would connect it to PHI2, knowing that nothing > will access it at the moment PH2 = (L). Hm.. I should be able to try this easily too. Actually I was thinking of something like that, as PHI2 (HI) is also used for allowing R/_W.. > Question out of curiousity: why using a 4168 and going through that > much trouble? Because I am running out of 6264/4364s, while I have a pile of unused 4168s. If was able to easily make the circuit both SRAM (_RFSH is NC there) and XRAM compatible I'd be happy with this and the chips would find some use ;-) -- SD! Message was sent through the cbm-hackers mailing listReceived on 2013-06-29 10:00:04
Archive generated by hypermail 2.2.0.