Cadence PCB Best Practices

Working with Real-Time DFA Analysis

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Page 13 of 28

Working with Design Partitions Design Partitioning October 2019 14 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Partition Strategy for Component Placement If a team approach is being considered for component placement, the master designer is responsible for allocating components to their respective partitions. This work is done prior to the export of design partition files (.dpf). The partition designer cannot access unplaced components stored in the master database nor ones not assigned to his or her partition area. Floor-Planning with Quickplace – The Quickplace utility, enhanced in Release15.5 with a Place by Partition option, can accelerate the placement of unplaced components into their respective partition areas. The new position option works with all available filters. If using the Allegro Design Entry HDL front-end, previously known as Concept HDL, Place by schematic page number may be the most efficient filter for master designer to consider. Quickplace is not available to the partition designer. Interactive Placement – The placement user interface is equipped with filtering options similar to the ones available in Quickplace. The master designer can manually place components by schematic page, part number, or wild-carding. When filtering is enabled, the placement list (which can consist of thousands of entries) becomes more manageable by displaying just the list of filtered components. The partition designer has access to the placement user interface by choosing Place – Manual and Show Command from the right mouse button menu. Only components deleted by the partition designer are displayed. Planning Partition Areas – Although the partition designer has the ability to temporarily place components outside his partition, Cadence suggests the master designer extend the partition areas (see Figure 1-4 on page 15) well outside the board outline. This not only gives the partition designer extra space to floor-plan, but also, these components remain in their current location during the import process. Components placed outside the partition area or ones that get deleted are reset to the placement buffer upon import. They will, however, retain a relationship to the partition. If a partition is re-exported, they remain with that partition if they were not placed elsewhere by the master. Components straddling partition boundaries are tagged as un-owned and cannot be moved by either the master or partition designer after export. After Quickplace or manual placement, ensure all components that may have to be repositioned are within the confines of the partition areas.

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