Biography
Enrollment Date: 2009
Graduation Date：2012
Degree：M.S.
Defense Date：2012.05.25
Advisors：Liji Wu
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Research and implementation on memory Test in 32-bit CPU Based SiP
Abstract:
SiP is a very high integration packaging technology that develops on the basis of SoC, through the techniques of micro-assembly and interconnection to accomplish systematic functions in a single package. This article is mainly about research on the testing of memory in 32-bit based CPU SiP, it includes board level verification、test method of memory in SiP and test platform building.
The SiP under discussion here is composed of a 32-bit CPU and an 8Gb NAND Flash chip, to ensure the feasibility of SiP, a board level verification method is used to verify the package in theory and experiment. During the board level verification, the NAND Flash chip is not in the same package with CPU. In board level verification, the NAND Flash is chosen here is Micon MT29F2G08AACWP with a memory capacity of 2Gb and 8-it.Board level verification is done in CodeWarrior compiler environment, the main task of board level verification is to test the communication between CPU and NAND Flash through the functions in NAND Flash. During the verification, every page (the smallest operational units in NAND Flash under discussion) in the 2 Gb capacity is tested.
After the board level verification successful finished, which proves the feasibility of SiP, then begins the testing of SiP sample. SiP testing is done on a testing PCB board with SiP sample wired on it, special testing pins will be kept for the testing in the SiP sample. The testing of SiP include software testing and hardware testing, the former is about the functional operation of NAND Flash in SiP under the control of CPU, the latter is to use the logical analyzer to collect the curve of all the control signals while NAND Flash is in operation, which is to ensure the correctness of electrical characteristics of SiP internal communication.
A testing method--S_32_M1 for memory in SiP is presented in this article, using this method in testing 32-CPU based SiP, coverage of 100% is reached while every page in the 8Gb NAND Flash being operatd.