利用 2.1i 版软件约束 Virtex 设计 Application Note: Virtex R Constraining Virtex Design in 2.1i XAPP400 (v1.0) October 1, 1999 Application Note Summary/ Constraining a Virtex Design is different in 2.1i compared to older versions of the software. Introduction There are improvements in the Trace, Timing Analyzer, FloorPlanner, Constraints Editor, and other implementation tools to help make the designing procedure easier for Virtex. This paper is devoted to describing some of the sim……