"21'b0" Verilog to VHDL explination please

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Hello

In Verilog I got this code:

cont <= 21'b0;

oRST <= 1'b1;

What does it mean in VHDL?

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In VHDL const would have to have 21 bits, eg.,

signal const : std_logic_vector(20 downto 0);

and you'd assign all zeros to it using

const <= (others => '0');

The signal oRST is a 1-bit signal, eg.,

signal oRST : std_logic;

and you'd assign a 1 to it via

oRST <= '1';

Cheers,

Dave