PoC.arith.div

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Implementation of a Non-Performing restoring divider with a configurable radix. The multi-cycle division is controlled by ‘start’ / ‘rdy’. A new division is started by asserting ‘start’. The result Q = A/D is available when ‘rdy’ returns to ‘1’. A division by zero is identified by output Z. The Q and R outputs are undefined in this case.

Entity Declaration:

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entity arith_div is
  generic (
    A_BITS             : positive;          -- Dividend Width
    D_BITS             : positive;          -- Divisor Width
    RAPOW              : positive := 1;     -- Power of Compute Radix (2**RAPOW)
    PIPELINED          : boolean  := false  -- Computation Pipeline
  );
  port (
    -- Global Reset/Clock
    clk : in std_logic;
    rst : in std_logic;
    
    -- Ready / Start
    start : in  std_logic;
    ready : out std_logic;
    
    -- Arguments / Result (2's complement)
    A : in  std_logic_vector(A_BITS-1 downto 0);  -- Dividend
    D : in  std_logic_vector(D_BITS-1 downto 0);  -- Divisor
    Q : out std_logic_vector(A_BITS-1 downto 0);  -- Quotient
    R : out std_logic_vector(D_BITS-1 downto 0);  -- Remainder
    Z : out std_logic  -- Division by Zero
  );
end entity arith_div;