PREHEAT oven to 350°F. Combine cereal, brown sugar and margarine; set aside. Prepare cake batter as directed on package. Pour half of the batter into greased 13x9-inch baking pan; top with half each of the cereal mixture and raspberries. Repeat all layers.

BAKE 40 min. or until wooden toothpick inserted in center comes out clean. Cool completely.

COMBINE icing sugar and orange juice. Drizzle over cake. Let stand until set. Cut into squares.