Robust%20Path%20Delay%20Test

1
Robust Path Delay Test

• Garimella Srinivas
• Gottiparthy Ramraj
• Vippa Prakash

2
CONTENTS

• Introduction
• Path Count Algorithm
• Critical Path Detection
• Robust path delay test with 5-valued logic
• Conclusion
• Demo and Questions

3
Introduction

• Delay Test A circuit that passes delay test
  must produce correct outputs when inputs are
  applied and outputs observed with specified
  timing.

• Fault Models
• Gate Delay Fault Model
• Path Delay Fault Model
• Path Count
• Critical Path Longest Delay Combinational Path.

4
Path Count Algorithm
A
1
1
B
3
F
1
G
J
1
L
2
C
3
K
E
H
1
I
1
D
1
Path Count 8
5
Critical Path Detection
A
1
L
B
H
2
I
O
3
Q
1
C
F
P
J
2
K
1
D
G
M
R
2
E
N
6
Robust Path Delay Test
Gate Transition And / Nand Or/ Nor
Rising (U1) U1 S0
Falling (U0) S1 U0
A
1
S1
B
2
S1
3
Q
1
U0
C
U0
F
U0
S1
2
U0
1
E
D
G
U0
R
2
7
Robust Path Delay Test
G1
s-a-0
S1
S1
3
Q
U0
C
U0
S1
U0
2
U0
1
D
G
U0
G2
s-a-0
8
Conclusion

• Achievements
• Better understanding of Hitec tool.
• Improvements
• Implement an Algorithm to determine Vectors.
• Implement Non-Robust test in case robust test
  fails.

9
Demo And Questions