Equality Detector Module M5.1 Section 6.1. Equality Detector XNOR X Y Z Z = !(X $ Y) X Y Z 0 0 1 0 1...
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Transcript of Equality Detector Module M5.1 Section 6.1. Equality Detector XNOR X Y Z Z = !(X $ Y) X Y Z 0 0 1 0 1...
4-Bit Equality Comparator
A0
A1
A2
A3
B0
B1
B2
B3
A_EQ_B
C0
C1
C3
C2
FIELD A = [A0..3];FIELD B = [B0..3];FIELD C = [C0..3];
Bit Fields
FIELD A = [A0..3];FIELD B = [B0..3];FIELD C = [C0..3];
A represents [A0, A1, A2, A3]
B represents [B0, B1, B2, B3]
C represents [C0, C1, C2, C3]
Listing 6.1 eqcomp1.pld
Name eqcomp1;Partno OU0004;Revision 01;Date 7/26/91;Designer R. E. Haskell;Company Oakland University;Location Rochester, MI;Assembly CSE 171;Device G16V8;Format j;
/******************************************************//* *//* This is a 4-bit equality comparator *//* using the ANDing of 4 XOR gates *//* *//******************************************************//* Target Device: G16V8 *//******************************************************/
/* Inputs: */
Pin [2..5] = [A0..3];Pin [6..9] = [B0..3];
/* Outputs: */
Pin 19 = A_EQ_B;
/* Intermediate variables */
FIELD A = [A0..3];FIELD B = [B0..3];FIELD C = [C0..3];
/* Logic equations */
C = !(A $ B);
A_EQ_B = C0 & C1 & C2 & C3;
Listing 6.1 eqcomp1.pld
Name eqcomp1;Partno OU0004;Revision 01;Date 7/26/91;Designer R. E. Haskell;Company Oakland University;Location Rochester, MI;Assembly CSE 171;Device G16V8;Format j;
/******************************************************//* *//* This is a 4-bit equality comparator *//* using the ANDing of 4 XNOR gates *//* *//******************************************************//* Target Device: G16V8 *//******************************************************/
/* Intermediate variables */
FIELD A = [A0..3];FIELD B = [B0..3];FIELD C = [C0..3];
/* Logic equations */
C = !(A $ B);
A_EQ_B = C0 & C1 & C2 & C3;
C = !(A $ B)
C0 = !(A0 $ B0)C1 = !(A1 $ B1)C2 = !(A2 $ B2)C3 = !(A3 $ B3)
A0
A1
A2
A3
B0
B1
B2
B3
A_EQ_B
C0
C1
C3
C2
.DOC File=============================================== Expanded Product Terms===============================================
A => A0 , A1 , A2 , A3
A_EQ_B => !A0 & !A1 & !A2 & !A3 & !B0 & !B1 & !B2 & !B3 # A0 & !A1 & !A2 & !A3 & B0 & !B1 & !B2 & !B3 # !A0 & A1 & !A2 & !A3 & !B0 & B1 & !B2 & !B3 # A0 & A1 & !A2 & !A3 & B0 & B1 & !B2 & !B3 # !A0 & !A1 & A2 & !A3 & !B0 & !B1 & B2 & !B3 # A0 & !A1 & A2 & !A3 & B0 & !B1 & B2 & !B3 # !A0 & A1 & A2 & !A3 & !B0 & B1 & B2 & !B3 # A0 & A1 & A2 & !A3 & B0 & B1 & B2 & !B3 # !A0 & !A1 & A2 & A3 & !B0 & !B1 & B2 & B3 # A0 & !A1 & A2 & A3 & B0 & !B1 & B2 & B3 # !A0 & A1 & A2 & A3 & !B0 & B1 & B2 & B3 # A0 & A1 & A2 & A3 & B0 & B1 & B2 & B3 # !A0 & A1 & !A2 & A3 & !B0 & B1 & !B2 & B3 # A0 & A1 & !A2 & A3 & B0 & B1 & !B2 & B3 # !A0 & !A1 & !A2 & A3 & !B0 & !B1 & !B2 & B3 # A0 & !A1 & !A2 & A3 & B0 & !B1 & !B2 & B3
B => B0 , B1 , B2 , B3
The GAL 16V8
1
2
3
4
5
6
7
9
10 11
12
8
19
20
17
18
15
16
13
14
GND
Vcc I/CLK I I/O
I I
I
I
I
I
I
I/OE
I/O
I/O
I/O
I/O
I/O
I/O
I/O
GAL 16V8
Structure of the GAL 16V8 PLDX X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
Pin 2
Pin 3
Pin 19
X
Y
Z
/* Inputs: */
Pin [2..5] = [A0..3];Pin [6..9] = [B0..3];
/* Outputs: */
Pin 19 = A_EQ_B;Pin 18 = D01; /* Intermediate pin output */Pin 17 = D23; /* Intermediate pin output */
/* Intermediate variables */
FIELD A = [A0..3];FIELD B = [B0..3];FIELD C = [C0..3];
/* Logic equations: */
C = !(A $ B);D01 = C0 & C1;D23 = C2 & C3;
A_EQ_B = D01 & D23;
=============================================== Expanded Product Terms===============================================
A => A0 , A1 , A2 , A3
A_EQ_B => D01 & D23
B => B0 , B1 , B2 , B3
C => C0 , C1 , C2 , C3
C0 => A0 & B0 # !A0 & !B0
C1 => A1 & B1 # !A1 & !B1
C2 => A2 & B2 # !A2 & !B2
C3 => A3 & B3 # !A3 & !B3
D01 => !A0 & !A1 & !B0 & !B1 # A0 & !A1 & B0 & !B1 # !A0 & A1 & !B0 & B1 # A0 & A1 & B0 & B1
D23 => !A2 & !A3 & !B2 & !B3 # A2 & !A3 & B2 & !B3 # !A2 & A3 & !B2 & B3 # A2 & A3 & B2 & B3
A_EQ_B.oe => 1
D01.oe => 1
D23.oe => 1
4-Bit Equality Comparator====================================-=============== Chip Diagram====================================================
______________ | eqcomp2 | x---|1 20|---x Vcc A0 x---|2 19|---x A_EQ_B A1 x---|3 18|---x D01 A2 x---|4 17|---x D23 A3 x---|5 16|---x B0 x---|6 15|---x B1 x---|7 14|---x B2 x---|8 13|---x B3 x---|9 12|---x GND x---|10 11|---x |______________|
End of .doc file