ADV_VLSI_Test_Lecture3

ADV_VLSI_Test_Lecture3 - Fault Models Traditionally used...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Fault Models: Traditionally used stuck at faults: - From board level design. A Siu . C D V D is stuck at 1. DD A B C D C is stuck at 0 and is connected to ground. Stuck -At -0 S-A -0 SA0 Stuck- At -1 S-A-1 SA1. Can be caused by thin oxide and metal-to metal shorts. - Other models exist, and are perhaps better. Stuck open, shorted. - Modern testers use stuck at models. CMOS problem – a fault can become a combinational circuit. Output= combinationalogic present state and also previous state
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example: A Output. B A B F= B A + With a fault. OUTPUT OUTPUT = outputn B A B A + + Previous output states. A B
Background image of page 2
Key features of testable design: Observability: Degree to which one can examine an internal node in the IC. Controllability: degree to which one can control an internal node in the IC. Sequential fault grading: Fault coverage: a measure of the good news of these test programs. Each circuit node is taken and put to 0 (SA0). The circuit outputs are compared to a known good machine. Then, this is repeated placing the internal nodes sequential to 1
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/24/2011 for the course EEE 5322 taught by Professor W.r.eisenstadt during the Fall '10 term at University of Florida.

Page1 / 4

ADV_VLSI_Test_Lecture3 - Fault Models Traditionally used...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online