On 7/7/06, Diego Sáenz <[EMAIL PROTECTED]> wrote:
Request Feature Coments
I think that pc relative call, jump and ret can be usefull so video controler
mini-programs will be relocatable.
Relocatable to where? There are only 512 words of program space. I
could imagine that if you were going to do a lot of weird stuff with
the display, where you didn't want to take the time to load a whole
new program for minor adjustments, that you might have lots of
alternative subroutines. Supporting DPVL might require this. But
even then, it's no big deal to make a handful of writes to adjust
pointers.
Also, this is infeasible from a hardware standpoint, since this would
require inserting a 9-bit adder into what is already the longest
combinatorial path in the design.
It's also probably infeasible to have more than one level of subroutine.
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