Figure 6-3 Blitter Minterm Venn Diagram - Commodore Amiga Hardware Reference Manual

Blitter
Figure 6-3: Blitter Minterm Venn Diagram
Examples of Venn Diagram Interpretation
1.
It
you wish to select a function D
=
A (that is, destination
=
A source only), you
can select only the minterms that are totally enclosed by the A-circle in the figure
above. This is the set of minterms 7, 6, 5, and 4. When written as a set of Is for the
selected min terms and Os for those not selected, the value becomes:
76543210 MINTERM NUMBERS
11110000
SELEOTED MINTERMS
F
o
equals $FO
2. If you wish to select a function that is a combination of two sources, you then look
for the min terms by both of the circles in their common area. For example, the com-
bination AB (A "and" B) is represented by the area common to both the A and B
circles. This area encloses both minterms 7 and 6.
176 Blitter Hardware