February, 2017
www.us-
tech.com Optimizing Multi-Board System Design Continued from page 57
data integrity and leverage reusable IP for all of the boards, connectors and cables in the system. Key components of the optimal
tool include: system-level design defi- nition, partitioning and connectivity management; cabling definition and connector assignment; concurrent col- laboration across the entire flow; sys- tem modeling for signal and power integrity, mechatronics, thermal, and manufacturability; co-design with MCAD tools for cabling and the enclo- sure; library and work-in-progress design data management; and IP inte- gration with enterprise business sys- tems and manufacturing. During system logic definition,
partitioned sets of blocks represent- ing boards need to be easily defined with drag-and-drop simplicity. The blocks need to also be easily re-parti- tioned, with the intelligence to auto- matically insert connectors between boards and transform intra-board nets into inter-board wires. The solu- tion must allow unlimited freedom to optimize the system across multiple boards during the definition stage. The process should be con-
trolled in the same manner as con- ventional forward and back-annota- tion between a single PCB schematic and a layout. A synchronization util- ity can pre-validate any pending changes and highlight them to the design team. Changes should be clearly enumerated and even color- coded to indicate status. Automatic changes, such as ref-
erence designator name or pin num- ber modifications, should also be clearly noted. Automation during synchronization will eliminate signif- icant and time-consuming manual updates — potentially on the order of weeks per iteration. As many of the inaccuracies in
multi-board system design occur in the connectors, it is important to have correct-by-design connector management that maintains the con- nectors and their pin mappings through any editing. Assuming a high level of automation in the tools, connector modifications would require minimal effort. This automation allows users to
create and modify connectivity at will using generic connectors without concerning themselves with the actu- al physical details of the parts. Connections within and between boards can be grouped to accelerate definition. And finally, to help vali- date connectivity across the system, signal tracing must be available to graphically follow the path of each interconnect. The data management infra-
structure provides the foundation for this multi-discipline collaboration. Data management enables a consis- tent flow-wide synchronization pro - cess, and is at the heart of cross-disci- plinary concurrent design. Access to design data and statistics without having to open authoring tools facili- tates design reviews and decision sup- port. Library and design data can be securely accessed and managed across large multi-user, multi-site enterprises. This process also enables the reuse of boards, connectors and cables.
Manufacturing Considerations For systems that consist of sep-
See at APEX, Booth 3019
arate PCBs with physical connectors, used to bring the boards and cables together into a product-level design, the fabrication process is the same as for any single element. Assembly is where the complex-
ity will vary depending on the num- ber of elements and sub-systems. However for systems that include rigid and flex PCBs, where the flex circuit substrates are attached to one or more rigid boards internally, the manufacturing process becomes more complex for both fabrication and assembly. For these systems that include both rigid and flex boards, some fundamental best
V diagram. Continued on page 61
Page 59
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KIC World Headquarters 858.673.6050
sales@kicmail.com www.kicthermal.com
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