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X74_521

8-Bit Identity Comparator with Active-Low Enable and Output

XC3000
XC4000E
XC4000X
XC5200
XC9000
Spartan
SpartanXL
Virtex
Macro
Macro
Macro
Macro
Macro
Macro
Macro
N/A

figures/x4191n.gif

X74_521 is an 8-bit identity comparator with 16 data inputs for two 8-bit words (P7 - P0 and Q7 - Q0), active-Low data output (PEQ), and active-Low enable (G). When G is High, the PEQ output is High. When G is Low and the two input words are equal, PEQ is Low. X74_521 does a bit comparison of the two words to determine equality. When any of the two equivalent bits from the two words are not equal, PEQ is High.

Inputs
Outputs
G
P7, Q7
P6, Q6
P5, Q5
P4, Q4
P3, Q3
P2, Q2
P1, Q1
P0, Q0
PEQ
1
X
X
X
X
X
X
X
X
1
0
P7Q7
X
X
X
X
X
X
X
1
0
X
P6Q6
X
X
X
X
X
X
1
0
X
X
P5Q5
X
X
X
X
X
1
0
X
X
X
P4Q4
X
X
X
X
1
0
X
X
X
X
P3Q3
X
X
X
1
0
X
X
X
X
X
P2Q2
X
X
1
0
X
X
X
X
X
X
P1Q1
X
1
0
X
X
X
X
X
X
X
P0Q0
1
0
P7=Q7
P6=Q6
P5=Q5
P4=Q4
P3=Q3
P2=Q2
P1=Q1
P0=Q0
0

Figure 11.45 X74_521 Implementation XC3000, XC4000, XC5200, XC9000, Spartans

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