types-pack.vhd

design compile synthesis user guide

package TYPES is
  -- Declares types used in the rest of the design
  type STATE_TYPE is (WAIT_FOR_START,
                      READ_BITS,
                      PARITY_ERROR_DETECTED,
                      ALLOW_READ);
  constant PARALLEL_BIT_COUNT: INTEGER := 8;
  subtype PARALLEL_RANGE is INTEGER
      range 0 to (PARALLEL_BIT_COUNT-1);
  subtype PARALLEL_TYPE is BIT_VECTOR(PARALLEL_RANGE);
end TYPES;