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Altera_Forum's avatar
Altera_Forum
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12 years ago

What should I use here - Need changing value in different processes

Hi, first post here and very poor VHDL knowledge. Tried my best but can't figure this out. Here is my problem: I have 3 buttons. When any one is pressed I want to reset a corresponding variable...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

you cannot clock a register from 2 sources, and you especially cannot clock a register when another clock is fired. having: 


if rising_edge(clk1) then
  if rising_edge(clk2) then

is impossible - think about it. You're asking to detect a rising edge that is exactly co-incident with another rising edge. I think what you mean is: 


if rising_edge(stepper_clk_i) then
  if clk_6Hz = '1' then --clock enable coding