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Altera_Forum
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8 years ago

FPGA Development Board - strange shift operation behavior

My development board based on: Cyclone IV EP4CE10E22C8N Quartus: 17.0.0 Lite Edition top-level entity code: module led4_reg(clk, led); parameter BASE_LED_SEQUENCE = 12'b000011101101...
Altera_Forum's avatar
Altera_Forum
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8 years ago

Hi,

Is your board an Altera/terasic dev board or a custom one based on Cyclone IV ? If its the Altera/terasic one, then most likely the LEDs are all active low , meaning, a writing a '0' will turn ON the LED and '1' will turn OFF the LED.