The Research On Boundary Scan Test Controller With USB Interface

As the result of the micro-electronics'development and highly fine packed ICs, such as embedded system and SoCs, was widely applied, there has been a dramatic increasing in che complexity of electronic system, and lead to the narrower space between function blocks. So the test model based on probes are no longer available. As one of the design for testability technology, Boundary Scan Test (BST) fixes boundary scan cells between the device pins and core logics. Thus, the BSC acts as the virtual test probe that carries out the test stimulus and captures the test response. So BST could improve the system's controllability and observability, and test problem could be settled easily.Firstly, a primary conception on BST standard IEEE1149.1 was introduced. As to be groundwork, some applications about BST in board test, test process and test vector generation arithmetic were enforced. The host block in BST Controller's hardware is DSP, which is change for data control and convert. After do some investigation, CY7C68013 and related software were to be the USB data transfer resolution. By using Veriolg HDL and a Top-Down design model, a TAP control logic was designed, which could reduce some DSP's work. According to some point of hardware, a test perform program which is used for communication with hardware was designed. Otherwise, by using some board-level test theories and methods, a test resolution, including BST infrastructure integrity test, interconnect test and cluster test was given. Using Visual C++, a board-level test vector generation and fault diagnoses software were designed and carried out. Finally, the USB driver for this controller was designed by using Windows DDK development kit.After tested, this controller has a correct function, accord with design request and has some advantages such as plus and play, doesn't need extern power, easy connection, and so on. In application, the test system which is established by the BST controller can test stuck-at faults, open faults and short faults on board, and gives some detail informations.