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Clock_signal problem

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Clock_signal problem by Unknown on Dec 9, 2003			Not available!
Hello, I have muxed two clock, like: clk4way: process (ClkProc, ClkIn, sel_clk) begin -- process if sel_clk = '0' then ClkIn_1 <= ClkProc; ClkIn_2 <= ClkIn; else ClkIn_2 <= ClkProc; ClkIn_1 <= ClkIn; end if; end process; And I received the below information when compiling my code: Clock Information: ------------------ -----------------------------------+------------------------+-------+ Clock Signal \| Clock buffer(FF name) \| Load \| -----------------------------------+------------------------+-------+ ClkIn_1(Mmux_ClkIn_1_Result1:O) \| NONE()(RamIn_1_Imag_ram_Mram_mem_inst_ramb_0)\| 2 \| ClkProc \| BUFGP \| 711 \| ClkIn_2(Mmux_ClkIn_2_Result1:O) \| NONE()(RamIn_2_Real_ram_Mram_mem_inst_ramb_0)\| 2 \| ClkOut \| BUFGP \| 2 \| -----------------------------------+------------------------+-------+ (*) These 2 clock signal(s) are generated by combinatorial logic, and XST is not able to identify which are the primary clock signals. Please use the CLOCK_SIGNAL constraint to specify the clock signal(s) generated by combinatorial logic. Then I wrote in my code: signal ClkIn_1 : std_logic; signal ClkIn_2 : std_logic; attribute clock_signal: string; attribute clock_signal of ClkIn_2 : signal is "yes"; But the problem continue... Someone knows the problem?? Regards... Tonny Matos Siqueira -------------- next part -------------- An HTML attachment was scrubbed... URL: <A HREF="http://www.opencores.org/forums.cgi/cores/attachments/20031211/93d1cd37/attachment.htm">http://www.opencores.org/forums.cgi/cores/attachments/20031211/93d1cd37/attachment.htm</A> Hello, I have muxed two clock, like: clk4way: process (ClkProc, ClkIn, sel_clk) begin -- process if sel_clk = '0' then ClkIn_1 http://www.opencores.org/forums.cgi/cores/attachments/20031211/93d1cd37/attachment.htm

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