Patent attributes
A method is provided to automatically allocate resources of an integrated circuit (IC) to form multipliers in a given design to optimize the use of IC resources. Information about the multipliers in the design is extracted to place the multipliers into a priority order. The priority allows primitives in the IC, like DSP blocks LUTs or MUXCYs to be economically allocated to the multipliers. The ordering criteria can include: (1) a user defined criteria, (2) the number of primitives required to implement a multiplier, or (3) a size of the multiplier operands. This invention further optimally allocates LUTs and MUXCYs when DSP48 blocks are exhausted. The steps for generating a multiplier include: constructing a partial product matrix and minimizing the adders used in the multiplier by minimizing the size of support for the partial products. Either LUTs or MUXCYs are selected depending on the size of support determined.
