AR #13229 - 11.1 Timing - I need a positive hold value, but I get a hold violation on my input port
11.1 Timing - I need a positive hold value, but I get a hold violation on my input port
| AR# | 13229 |
| Topic | SW-Timing Analyzer/TRCE |
| Last Modified | 2009-07-07 00:00:00.0 |
| Status | Active |
Description
Keywords: TRCE, positive, hold, value, input, port
I need a positive hold requirement for my input port, but the timing tools are reporting a hold violation. Why am I receiving a hold violation, and how can I solve this issue?
Solution
If you have positive hold time requirements and you do not specify a data VALID duration with your OFFSET constraints, you will receive a hold error (TRCE assumes VALID=OFFSET for a zero hold time check).For more details on timing constraints, please see the Timing Constraints User Guide: http://www.xilinx.com/support/documentation/sw_manuals/xilinx11/ug612.pdf