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Answers Database
M1.3 MAP: "Unable to obey design constraints" errors / Unsupported CLB combinations involving dual output logical components (DPRAM, RAM16x2)![]() Record #2345
Product Family: Software ![]() F and G combinational outputs from the same CLB drive 2- or 3-input LUT that could be pa cked into the H LUT. The same problem presents itself when trying to map a 16x2 RAM with additional logic that could fit into an H-LUT. Solution 1: The only workaround available is to create the desired CLB configuration in EPIC, generate a physical macro from it, and instantiate it into your design. For more information on creating physical macros, refer to the (Xilinx Manual EPIC Design Editor Reference/User Guide). End of Record #2345 - Last Modified: 06/26/99 16:19 |
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