BWB transmission wiring design system

• US 6,883,157 B2
• Filed: 11/19/2002
• Issued: 04/19/2005
• Est. Priority Date: 05/20/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Matsumoto, Hideaki, Okada, Akira, Teshima, Yasuhiro
• Primary Examiner(s): Do, Thuan
• Assistant Examiner(s): LEVIN, NAUM B
• Application Number:
  US10/299,334
• Publication Number:
  US 20030217349A1
• Time in Patent Office: 882 Days
• Field of Search: 716 4- 6, 716 12- 15, 714724-725, 714736-737, 700 95- 97
• US Class Current: 716/115
• CPC Class Codes: G06F 30/394 Routing G06F30/396 takes precedence
• CPC Class Codes: H05K 1/0237 High frequency adaptations H05K1/0216 takes precedence
• CPC Class Codes: H05K 3/0005 for designing circuits by computer

Abstract

The present invention relates to a BWB wiring design system, and provides a BWB transmission wiring design system capable of guaranteeing the super high-speed operation of a system composed of a BWB and a plurality of printed circuit boards mounted on the BWB. The BWB transmission wiring design system consists mainly of a manager system that manages the wiring in the entire BWB system composed of the plurality of printed circuit boards, and a designer system that designs the wiring on each of the plurality of printed circuit boards while communicating with the manager system. The manager system presents the designer system predetermined design target values relevant to the entire BWB system. Moreover, the manager system presents the designer system the result of judgment made from design information, which is sequentially distributed from the designer system, on whether the design target values can be attained. The designer system finishes a wiring design while referencing the presented design target values and the presented result of judgment.

Claims

1. A back wiring board (BWB) transmission wiring design system having a managing means that manages the wiring in an entire BWB system composed of a plurality of printed circuit boards, and a designing means that designs the wiring on each of the plurality of printed circuit boards while communicating with said managing means, wherein:

said managing means presents said designing means with a predetermined overall design target value of the permissible transmission loss relevant to the entire BWB system, and also presents a result of judgment made from design information, which is distributed from said designing means, on whether the overall design target value can be attained; and

said designing means completes a wiring design while referencing the presented overall design target values and the presented result of judgment;

wherein said managing means presents said designing means with a message helpful in attaining the overall design target value.

2. A BWB transmission wiring design system according to claim 1, wherein:

said managing means includes an LSI device information manager that manages LSI device information concerning signal transmission LSIs installed at transmitting and receiving ends of transmission lines each including signal lines formed on the plurality of printed circuit boards; and

said managing means presents said designing means, as the overall design target value, with a permissible transmission loss that is permitted to occur on the transmission line and that is determined based on the LSI device information.

3. A BWB transmission wiring design system according to claim 2, wherein:

said managing means further includes a part information manager that manages part information concerning parts employed in said BWB system, and a circuit board information manager that manages circuit board information concerning printed circuit boards employed in said BWB system;

the design information distributed from said designing means, and the part information and circuit board information associated with the design information are used to calculate a designed transmission loss that is caused by all of the plurality of printed circuit boards; and

the designed transmission loss is compared with the permissible transmission loss in order to judge whether the overall design target value is attained.

4. A BWB transmission wiring design system according to claim 3, wherein said LSI information manager, part information manager, and circuit board information manager each collect, in real time, design information sequentially distributed from said designing means, and thus, if necessary, update information any time.