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Timing Groups and OFFSET Const

消耗积分:2 | 格式:rar | 大小:3444 | 2010-01-11

goodmbby

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Timing Groups and OFFSET Constraints:

•Use the Constraints Editor to create groups of path endpoints
• Use the Constraints Editor to create path-specific OFFSET constraints

Path-Specific Timing
Constraints
• Using global timing constraints (PERIOD, OFFSET, and PAD-TO-PAD) will
constrain your entire design
• Using only global constraints often leads to over-constrained designs
– Constraints are too tight
– Increases compile time and can prevent timing objectives from being met
– Review performance estimates provided by your synthesis tool or the Post-
Map Static Timing Report
• Path-specific constraints override the global constraints on specified paths
– This allows you to loosen the timing requirements on specific paths

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