DESIGNING PROGRAM OF PROGRAMMABLE LOGIC DEVICE, PROGRAMMABLE LOGIC DEVICE DESIGNING APPARATUS, AND METHOD THEREOF

摘要

In the designing program of a programmable logic device, the logical expression of the combinational circuit is acquired from the arranged wire information on the programmable logic device. Next, a wire delay amount connected to an input port of the combinational circuit is acquired from the arranged wire information. Next, the input ports of the connection destinations of the wires connected to at least two input ports of the combinational circuit are exchanged so that the input order coincides with the input order corresponding to the logical expression of the combinational circuit stored in the input port change table. This processing is based on a cell delay amount of the combinational circuit and the wire delay amount. Then, the logical expression of the combinational circuit is changed in accordance with the exchange of the input ports of the connection destinations of the wires.