Longtime M&A rivals Latham & Watkins and Skadden, Arps, Slate, Meagher & Flom are on opposite sides of the proposed $6.6 billion merger announced Monday between microchip makers Avago Technologies Ltd. and LSI Corp.

Avago, which is based in Singapore and San Jose, announced that it is funding its acquisition of LSI with $1 billion of its own cash, another $1 billion through an investment by former private equity owner Silver Lake Partners and a $4.6 billion loan from a group of banks led by Deutsche Bank Securities.