1. 2’s Complement 4-Bit Saturator
Lab 4
2’s Complement 4-Bit Saturator

2. NASA Tech Briefs
November 2001 A Y0 Y1 Y2 Y3 X0 X1 X2 B X3 X4 X5 c0 c1

3. Sat4bit.abl DECLARATIONS " INPUT PINS " X5..X0 PIN 6,7,11,5,72,71;
" INPUT PINS "
X5..X0 PIN 6,7,11,5,72,71;
X = [X5..X0];
" OUTPUT PINS "
Y3..Y0 PIN 44,43,41,40;
Y = [Y3..Y0];
c0 NODE;
c1 NODE;
s NODE;
A3..A0 NODE;
A = [A3..A0];
B3..B0 NODE;
B = [B3..B0];

4. Add test vectors to .abl file test_vectors (X -> Y) -32 -> -8;
-17 -> -8;
-9 -> -8;
-8 -> -8;
-7 -> -7;
-6 -> -6;
-5 -> -5;
-4 -> -4;
-3 -> -3;
-2 -> -2;
-1 -> -1;
0 -> 0;
1 -> 1;
2 -> 2;
3 -> 3;
4 -> 4;
5 -> 5;
6 -> 6;
7 -> 7;
8 -> 7;
16 -> 7;
31 -> 7;
Add test vectors to
.abl file

5. test_vectors (X -> Y)
Fill in this table in the Lab
test_vectors (X -> Y)
Switch settings
LED1 – LED2
-32 -> -8;
-17 -> -8;
-9 -> -8;
-8 -> -8;
-7 -> -7;
-6 -> -6;
-5 -> -5;
-4 -> -4;
-3 -> -3;
-2 -> -2;
-1 -> -1;
0 -> 0;
1 -> 1;
2 -> 2;
3 -> 3;
4 -> 4;
5 -> 5;
6 -> 6;
7 -> 7;
8 -> 7;
16 -> 7;
31 -> 7;