Heat oven to 350°F. Unroll 1 can of dough and separate into 2 long rectangles. Place in ungreased 13x9-inch pan; press in bottom and 1/2 inch up sides to form crust. (If using crescent rolls, firmly press perforations to seal.) Bake 5 minutes. Meanwhile, in large bowl, mix walnuts, 1/2 cup of the sugar and the cinnamon.