Abstract: An application server reads components data from a component information system (CIS) of a database server connected to the application server. The components data are converted to HDL data. If the converted HDL data includes illegal characters, a user is prompted to modify the illegal characters. If the converted HDL data does not include illegal characters, the application server amends formats of the converted HDL data according to requirements of each client connected to the application server. Each client includes a drawing unit. The application server controls the drawing unit to draw circuit diagram using the HDL data with the amended formats.

Abstract: A printed circuit board includes a top layer, a bottom layer, and a mounting hole vertically extending through the top layer and the bottom layer. A first copper ring is located on a top surface of the top layer and around the mounting hole. A second copper ring is located a bottom surface of the bottom layer and around the mounting hole. A number of first pads are positioned on the first copper ring. A number of second pads are positioned on the second copper ring. The first and second copper rings are covered with solder mask, but the first and second pads are not covered with the solder mask.

Abstract: An application server reads components data from a component information system (CIS) of a database server connected to the application server. The components data are converted to HDL data. If the converted HDL data includes illegal characters, a user is prompted to modify the illegal characters. If the converted HDL data does not include illegal characters, the application server amends formats of the converted HDL data according to requirements of each client connected to the application server. Each client includes a drawing unit. The application server controls the drawing unit to draw circuit diagram using the HDL data with the amended formats.