30 Jul
2013
30 Jul
'13
10:33 a.m.
On Tue, Jul 30, 2013 at 11:17 AM, Kyle Owen <kylevowen at gmail.com> wrote:
When I said "extra," I was trying to imply
"leftover" on the RAM side of
things. Take, for instance, the 4MB RAM board from the folks at N8VEM.
Configured for 16-bit operations, a 12-bit word will fit just fine with a
nibble left over.
Maybe we're arguing the same thing; I don't know. But the question still
stands: what would one do with a spare nibble for each word?
Ignore it.
Except that you might need to have some address range that is mapped
as contiguous 8-bit bytes with the top 4 bits as don't care, so that
you can deal with device registers without losing the ability to
access half of the bits out of every other register.