On 9/22/2019 2:55 PM, Justin Cordesman wrote: > > Forgive me if this is infeasible since I don’t know the architecture > well enough, but what about using the MMU’s privileged position to > watch for a specific peek or poke or both pattern and only then expose > addresses? Assuming that is doable, you could even have alternate > patterns that would expose the MMU at different addresses so that it > was run time selectable. > > Justin > > > On Sep 22, 2019, at 13:37, Mia Magnusson <mia_at_plea.se> wrote: > > > As I look at the MMU PLA mappings, it seems like the following combinations will be prevalent: * ROMs banked in, IO banked in, so $cxxx is a good choice * ROMs out, IO in, so $cxxx is good, and so if $fxxx *All RAM, in which case $fxxx is best. SD, indirect addressing also eats up macrocells in the CPLD, so it's doubly bad. JIm -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2020-05-29 22:40:19
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