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Altera_Forum's avatar
Altera_Forum
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18 years ago

Multiple Distinct Clocks Error

Hello everyone, I am trying to write some code to use the debounced keys on the Altera DE2 board. I have spent days on the same error: "Error (10820): Netlist error at lab1.vhd(49): can't infe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

I received the same error about the multiple clocks. My design had the following format: 

process (rst, clk) begin
   if rising_edge(rst) then
      -- asynchronous reset stuff
   elsif rising_edge(clk) then
      -- synchronous stuff
   end if;
end process;

The fix for me was to change my reset from rising edge triggered to level sensitive: 

process (rst, clk) begin
   if (rst = '1') then
      -- asynchronous reset stuff
   elsif rising_edge(clk) then
      -- synchronous stuff
   end if;
end process;

Hope this helps.