![]() ![]() ![]() For example, in Figure 1, the multiple interface-error markers between instance D1/C1 and D1/D2 show that the placement of instance D1 shifted.įigure 1. Groups of violations between block regions can identify shifted placements or overlapping blocks that chip designers can easily fix. ![]() And wouldn’t it be even better if you could do all this automatically? Why it happensĬhip-level designers typically identify block-placement issues by looking for routing violations in the interface region where blocks abut in the design floorplan. It simplifies chip-level debugging while providing block owners with actionable information they can use to debug and fix these errors within their blocks. Removing these from the chip-level context and pushing the error reporting in this instances down into targeted blocks benefits both the block and chip owners. Because they are contextual, they cannot be fixed by the chip-level designers, but because they aren’t identified as such, they cause a lot of unnecessary debugging and even tapeout delays. However, when the incomplete block data does not yet comply with design rule checking (DRC), block-level contextual errors can be promoted to the chip level. Running chip-level verification at intervals throughout the design implementation flow lets chip-level designers find and fix block placement issues early in the design flow, while they are still relatively easy to adjust. Periodically, the chip-level team merges chip-level data and incomplete block layouts exported from place and route (P&R) tools in the OASIS or GDS format to perform incremental physical verification. In a continuous-build model, teams working on block-level designs work parallel to the chip-level designers, who instantiate work-in-progress blocks into the chip’s floorplan. In a continuous-build design flow, at which level should your error markers be addressed?Īlmost all of today’s chip designers use the continuous-build environment approach in contrast to the waterfall methodology of the past. ![]()
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