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MDuse's avatar
MDuse
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7 years ago

Program not working as expected

Hi, my device consists of MCU, MAX V CPLD and sensor device. MAX V CPLD is used to interface sensor to MCU. I have a code in VHDL for MAX V CPLD: entity Device is port ( clk16: in std_logic...
MDuse's avatar
MDuse
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7 years ago

FYI: with scope, I can see that the code doesn't work when MCU pulls the line low exactly at rising edge of clk_out. Then, CPLD correctly detects start = '0' but it doesn't set start to zero (line 28). CPLD then starts doing its job but the start line is released once MCU releases. That is not good as MCU detects rising edge (finished job) when CPLD is actually still working.