digital testing

Modern Packaging

By: Malou Mistal

evolution of electronic packaging

From DIP -> QFP -> BGA -> CSP

Changes driven  by increasing pin count, system performance and heterogonous integration

Board Testing Issue

By: Gwyne Gonzales

JTAG Boundary-Scan

By: Mylene A. King

JTAG Boundary Scan

  • Introduction
  • Device Architecture
  • Board Level Application
  • Demo

What is JTAG?

joint test acCESS group

BOUNDARY SCAN

why it is develop?

Motivation for BOUNDARY SCAN

  • Modern Packaging
  • Board Testing Issues

serial shift register around the boundary of the device

 PRINCIPLE of Boundary scan architecture

USING BOUNDary scan path

boundary scan cell

Note: This is just an example.

IEee 1149.1 STANDARD

(JTAG) boundary scan

video

DeviCE ARCHITECTURE

DEVICE architecture

instruction register

standard instruction

TAP controller

(test access port)

tap controller

tap controller state diagram

bypass register

identification register

boundary scan register

BOARD LEVEL APPLICATION

general strategy

Step 1 - Carry out a board-level boundary-scan infrastructure test

Step 2 - Use the Extest instruction to select the boundary-scan registers

Step 3 - Apply tests to the non-boundary-scan devices

interconnect test example

testing non-boundary scan devices

testing a ram array via boundary scan

tester hardware

where are we today?

the explosive growth of boundary scan technology

references

IEEE 1149.1 JTAG and Boundary Scan Tutorial by Dr. Ben Bennetts

DEMO

DEmo videos

END

Digital Testing

By Mylene King

Digital Testing

COE215 Design of Digital Systems and Computers

  • 944