On Sat, Mar 14, 2020 at 2:12 PM Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote:
> the MSV11-Q > sends a 'write' signal to _all_ the banks, and selects the one to > _actually_ > use by use of the RAS signal. > [...] > Has anyone else seen this trick used anywhere else? > Yes, that's very common. If you have multiple banks, you have to do some form of address decode for /RAS [*]. If you're doing that, there's no point to having another decode system for /WR. Eric * Alternately, /RAS could be common and /CAS decoded. That effectively does a refresh cycle on all non-selected banks, but using whatever the row address just happens to be, so unless you add a LOT of additional complexity, it's not very helpful, and increases power dissipation. I've only seen a few designs that did this, and there didn't seem to be any good reason for it.