AR# 2308: M1.3 MAP: Map doesn't validate PROHIBIT constraints before writing them out.
AR# 2308
M1.3 MAP: Map doesn't validate PROHIBIT constraints before writing them out.
描述
Keywords: map, prohibit, par, constraint
Urgency: standard
General Description: Map does not validate PROHIBIT constraints before writing them out to the respective .ucf or .pcf constraints files. For example, the TBUF_R1C1 constraint should be converted to TBUF_R1C1.* since this is the syntax that PAR would expect.
As a result, the PAR will end up flagging errors on such invalid constraints later during the place and route design step.
解决方案
This problem is likely to arise when converting XACTstep 5.x and 6.x designs utilizing the pre-M1 XACT-step constraint syntax, or when using the same pre-M1 syntax in .UCF constraint files with the M1 core tools.
The workaround for this problem is to modify the constraint manually in either the input design, the .ucf, or .pcf constraints file, following M1 guidelines.
Please refer to (Xilinx solution 1604) for more information about M1 specific constraints and syntax.
Bug Reference #: 17577 (fixed in version 1.4) r_stm/kl