Difference between revisions of "CSC270 Homework 4 Solution 2011"
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return inputs[ C0 + 2*C1 ] | return inputs[ C0 + 2*C1 ] | ||
| − | def decode3To8( | + | def decode3To8( I2, I1, I0 ): |
outputs = [0, 0, 0, 0, 0, 0, 0, 0] | outputs = [0, 0, 0, 0, 0, 0, 0, 0] | ||
outputs[ I0 + I1*2 + I2*4 ] = 1 | outputs[ I0 + I1*2 + I2*4 ] = 1 | ||
| Line 39: | Line 39: | ||
def main(): | def main(): | ||
#--- verification of the majority voter --- | #--- verification of the majority voter --- | ||
| + | print "Majority voter verification" | ||
print "a b c | f " | print "a b c | f " | ||
print "------+---" | print "------+---" | ||
| Line 46: | Line 47: | ||
f = mux4To1( 0, c, c, 1, a, b ) | f = mux4To1( 0, c, c, 1, a, b ) | ||
print "%d %d %d | %d" % ( a, b, c, f ) | print "%d %d %d | %d" % ( a, b, c, f ) | ||
| + | |||
| + | #--- verification of decoder --- | ||
| + | print "\n\nDecoder verification" | ||
| + | print "a b c | I7 I6 I5 I4 I3 I2 I1 I0" | ||
| + | print "------+------------------------" | ||
| + | for a in [0,1]: | ||
| + | for b in [0,1]: | ||
| + | for c in [0,1]: | ||
| + | I7, I6, I5, I4, I3, I2, I1, I0 = decode3To8( a, b, c ) | ||
| + | print "%d %d %d | %2d %2d %2d %2d %2d %2d %2d %2d" \ | ||
| + | % (a, b, c, I7, I6, I5, I4, I3, I2, I1, I0 ) | ||
main() | main() | ||
| + | |||
</pre></code> | </pre></code> | ||
==Output== | ==Output== | ||
<code><pre> | <code><pre> | ||
| + | Majority voter verification | ||
a b c | f | a b c | f | ||
------+--- | ------+--- | ||
| Line 63: | Line 77: | ||
1 1 0 | 1 | 1 1 0 | 1 | ||
1 1 1 | 1 | 1 1 1 | 1 | ||
| + | |||
| + | |||
| + | Decoder verification | ||
| + | a b c | I7 I6 I5 I4 I3 I2 I1 I0 | ||
| + | ------+------------------------ | ||
| + | 0 0 0 | 1 0 0 0 0 0 0 0 | ||
| + | 0 0 1 | 0 1 0 0 0 0 0 0 | ||
| + | 0 1 0 | 0 0 1 0 0 0 0 0 | ||
| + | 0 1 1 | 0 0 0 1 0 0 0 0 | ||
| + | 1 0 0 | 0 0 0 0 1 0 0 0 | ||
| + | 1 0 1 | 0 0 0 0 0 1 0 0 | ||
| + | 1 1 0 | 0 0 0 0 0 0 1 0 | ||
| + | 1 1 1 | 0 0 0 0 0 0 0 1 | ||
</pre></code> | </pre></code> | ||
| Line 119: | Line 146: | ||
</pre></code> | </pre></code> | ||
| + | |||
| + | =RS Flip-Flops with NAND/NOR and XOR/XOR= | ||
| + | |||
| + | * We cannot store both 1 or 0 in the NAND/NOR. | ||
| + | * Similarly, we cannot store 1 or 0 in the XOR/XOR. | ||
| + | * Some of you used the kits to verify this. VERY GOOD IDEA! | ||
</onlydft> | </onlydft> | ||
