| 主权项 |
1. A computer-based method for checking signal transmission lines of a printed circuit board (PCB) layout, the method comprising:
determining differential pairs to be checked in a displayed PCB layout, and dividing the differential pairs to be checked into a first group of differential pairs and a second group of differential pairs according to a preset rule using a computer device; responding to user input to set a first reference distance between differential pairs belonging to a same group and a second reference distance between differential pairs respectively belonging to the first and second groups using the computer device; creating a plurality of first boxes each surrounding one line section of one to be checked signal differential line of the first group, and creating a plurality of second boxes each surrounding one of the first boxes when the one signal differential line of the first group needs to be checked, and further creating a plurality of third boxes each surrounding one line section of one to be checked differential line of the second group when the one signal differential line of the second group needs to be checked using the computer device, wherein the length of each first box is the same as the corresponding line section to be checked in the first box, the width of each first box is the total of the width of the line section to be checked in the first box and twice of the first reference distance, the length of each second box is the same as the corresponding first box surrounded by the second box, and the width of each second box is the total of the width of the line section to be checked in the first box and twice of the second reference distance, the length of each third box is the same as the corresponding line section to be checked in the third box, the width of each third box is the total of the width of the line section to be checked in the third box and twice of the first reference distance, the line section to be checked surrounded by each first box and each second box is the symmetry axis of the first box and the second box, and the line section to be checked surrounded by each third box is the symmetry axis of the third box; and closing signal layers of the displayed PCB except the signal layer adjacent to the signal layer where the line section to be checked is in, and determining whether or not in each first box, each second box, and each third box there are differential lines which do not satisfy design standards using the computer device, wherein when one line section of the first group needs to be checked, whether or not in each first box there are other line sections which belong to the first group or the second group are determined, and whether or not in each second box there are other line sections which belong to the second group are determined, each determined other line section in each first box and the line section to be checked in the first box are a pair of line sections which do not satisfy the design standards, and each determined other line section in each second box and the line section to be checked in the second box are a pair of line sections which do not satisfy the design standards; and when one line section of the second group needs to be checked, whether or not in the third box there are other line sections which belong to the second group are determined, and each determined other line section in each third box and the line section be checked in the third box are a pair of line sections which do not satisfy the design standards. |
