ALU symbol ???

[KruSat]

What is the significance of keeping the symbol of ALU as.....
(view the symbol using const. width text like "courier")

A B
|||| ||||
\~~~~\ /~~~~/
\ \/ /
\ ALU /
\_______/
||||
S


while the other symbols are simply blocks....

plz. help me to solve my query...

 

[Rich Grise]

What is the significance of keeping the symbol of ALU as..... (view the
symbol using const. width text like "courier")

Maybe if you embellished the symbol a little bit:

A B
|||| ||||
\~~~~\ /~~~~/
\ \/ /
F --/4/--\ ALU /
\______/
/ |||| \
Cout S Cin

Where "F" is the "Funtion" selector, A and B are the operands, and S is
the result. I suppose they _could_ have just drawn a box, but that doesn't
impart the sense of what happens - A and B get conglomerated together
somehow, and the output is a whole new number. And F can be anything - AND,
OR, NAND, NOR, XOR, XNOR, ADD, SUB, MULT, DIV, SHIFT - whatever.
(admittedly, MULT and DIV would need more bits of output. ;-) )

Hope This Helps!
Rich