What is the boundary?

Border scanning is a method for testing all connections to plates with circuits (PCB) using border scan cells instead of physical probes. It is a standard widely accepted by electronic companies. Prototype and product design can also benefit from border scans. With the advent of increasingly miniaturized components, larger devices of the device, multilayer boards and surface -mounted packaging, the physical approach to all PCB connections was increasingly difficult. Testing in the circuit is essential for investigating manufacturing defects, such as open and abbreviations and damaged or missing components. It was necessary to develop another methodology for testing the PCB without requireing a physical approach to all components on the board. All components in the device itself. This group of engineers created a process for testing border scanning at the age of 80. In 1990 it was standardized as IEEE STD. 1149.1-1990.

while jtag did not invent the concept itself, they were helpful in converting the basic thoughts ofInternational standard. At present, the border scan is also known as Jtag. Revision IEEE STD. 1149.1 was introduced in 1993, and it was called 1149.1a. This particular revision consisted of certain improvements and clarification. Later in 1994, a complement describing the language of the border scanning description (BSDL) was added.

Physical access was built into the device by including the internal registers of the serial shift to its borders. These registers are called border scan registers and can be considered virtual nails. They can be used to test all PCB connections. Bounegistry gifts Scan are located at the beginning and end of the areas that will most likely be damaged during the board assembly. This is also called the connection area.

These border scan registers or cells can force and capture data from the pins to the device. The data obtained in this way are compared withExpected results for testing records for errors. This is a much easier way to test components for proper connection, work functionality and alignment. Border scanning was originally used in the production phase of the product life cycle, but due to the introduction of the IEEE-1149.1 standard, they are currently used throughout the product life cycle.

The advantage of using border scans to test PCBs is lower equipment costs that accelerate development; short test times; better test coverage; and higher product quality. Electronics manufacturers around the world rely on border scanning to test PCB efficiently and cheaply.