ENTITY xr2_x1 IS
GENERIC (
  CONSTANT area          : NATURAL := 2250;
  CONSTANT cin_i0        : NATURAL := 21;
  CONSTANT cin_i1        : NATURAL := 22;
  CONSTANT rdown_i0_q    : NATURAL := 2850;
  CONSTANT rdown_i1_q    : NATURAL := 2850;
  CONSTANT rup_i0_q      : NATURAL := 3210;
  CONSTANT rup_i1_q      : NATURAL := 3210;
  CONSTANT tplh_i1_q     : NATURAL := 261;
  CONSTANT tphl_i0_q     : NATURAL := 292;
  CONSTANT tplh_i0_q     : NATURAL := 293;
  CONSTANT tphh_i0_q     : NATURAL := 366;
  CONSTANT tphl_i1_q     : NATURAL := 377;
  CONSTANT tpll_i1_q     : NATURAL := 388;
  CONSTANT tpll_i0_q     : NATURAL := 389;
  CONSTANT tphh_i1_q     : NATURAL := 405;
  CONSTANT transistors   : NATURAL := 12
);
PORT (
  i0     : IN  BIT;
  i1     : IN  BIT;
  q      : OUT BIT;
  vdd    : IN  BIT;
  vss    : IN  BIT
);
END xr2_x1;

ARCHITECTURE vbe OF xr2_x1 IS

BEGIN
  ASSERT ((vdd AND NOT (vss)) = '1')
  REPORT "power supply is missing on xr2_x1"
  SEVERITY WARNING;
  q <= (i0 XOR i1) AFTER 1000 ps;
END;