17 Jun
2011
17 Jun
'11
10:59 p.m.
On 18 Jun 2011 at 1:27, Dan Roganti wrote:
hope my ascii schematics still works (using courier
font)
Maybe we're saying the same thing and not seeing it.
Positive logic
AB --DeMorgan-> ~((~A) + (~B))
To negative logic, drop the bubbles on the DeMorgan equivalence on
inputs and outputs. To avoid confusion, we'll say that the logic
gates retain their same operation for high (H) and low (L) voltages:
AB (postive logic) = (A+B) negative logic
LL L LL L
LH L LH H
HL L HL H
HH H HH H
If, in the first colum, we take H = 1 and L = 0, and in the second
column, H = 0 and L = 1, the logic maps are identical.
--Chuck