14 Dec
2008
14 Dec
'08
5:33 p.m.
Allison wrote:
Have you lookd at DG Nova? Sounds like your
traversing that same path.
Yes and NO!
A table driven assembler can produce anything.
99% of the code I have seen assumes 8 bit bytes.
I have decided to a 20 bit cpu ... 10 bit bytes. So far every thing
seems to fit in the CPLD's I can get, but it is not done until
I get all the bugs checking done, as right now it is more hacking
as I go with the logic.
Try Idea, it fits , fix new bug, it don't fit, start over again.
The IDE can be 9 bits as the upper 8 (or less) bits
are only used for data and a
non required ops. I've done that for 8bits to simplify the interface and the
only cost is 50% of the data space was not used, a minor nit as I had 500%
more than needed.
I plan to do it that way ... Just I/O lines on the CPLD's are very limited.
Allison