Xilinx 时序约束用户手册 Timing Constraints User Guide [Guide Subtitle] [optional] UG612 (v12.1) April 19, 2010 [optional] UG612 (v12.1) April 19, 2010 www.xilinx.com TIming Constraints User Guide Xilinx is disclosing this user guide, manual, release note, and/or specification (the "Documentation") to you solely for use in the development of designs to operate with Xilinx hardware devices. You may not reproduce, distribute, republish, download, display, post, or transmit the Documentation in any form or by any means including, but not limited to, electronic, mechanical, photocopying, recording, or otherwise, without the prior written consent of Xilinx. Xilinx expressly disclaims any liability arising out of your use of the Documentation. Xilinx reserves the right, at ……