Trying to understand vhdl led blinking code

vhdl

I have a led blinking code for MachXO2 breakout board written in VHDL. Actually I am new to VHDL.

I am not able to understand the meaning of these lines:

--internal oscillator
   COMPONENT OSCH
      GENERIC(
            NOM_FREQ: string := "53.20");
      PORT( 
            STDBY    : IN  STD_LOGIC;
            OSC      : OUT STD_LOGIC;
            SEDSTDBY : OUT STD_LOGIC);
   END COMPONENT;
BEGIN
   --internal oscillator
   OSCInst0: OSCH
      GENERIC MAP (NOM_FREQ  => "53.20")
      PORT MAP (STDBY => '0', OSC => clk, SEDSTDBY => OPEN);

Can you please tell me What these lines are doing?

Best Answer

These lines use an externally defined component, called OSCH, that magically provides a clock on the osc output as long as the stdby input is low.

The osc output is then connected to the clk signal and the stdby input connected to 0 (i.e. the switch-off function is not used.

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