Configurable computational unit embedded in a programmable device

A programmable logic device, comprising:

• a plurality of input/output cells;
• an array of macrocells;
• a plurality of routing resources that programmably couple said macrocells and said input/output cells;
• and
• at least one configurable computational unit programmably coupled to said routing resources, said configurable computational unit comprising:
• at least an adder circuit and a multiply circuit;
• and
• said adder circuit switchably coupled to said multiply circuit and an accumulate circuit.

An apparatus comprising:

• a field programmable gate array;
• a plurality of configurable computational units embedded within said field programmable gate array, each of said configurable computational units comprises:
• an adder circuit switchably coupled to an m×n multiply circuit and an accumulator circuit;
• a first input terminal for receiving a first set of data;
• said m×n multiply circuit having a multiplicand terminal coupled to said first input terminal, a multiplier terminal coupled to said first input terminal, and an output terminal, said multiplicand receiving m bits of data from said first set of data and said multiplier terminal receiving n bits of data from said first set of data;
• a first multiplexer circuit having a first data terminal coupled to said output terminal of said m×n multiply circuit, a second data terminal coupled to said first input terminal, an output terminal, and a select terminal;
• and
• said adder circuit having a first input terminal coupled to said output terminal of said first multiplexer circuit, and having a second input terminal and an output terminal.

A programmable logic device, comprising:

• a plurality of input/output cells;
• an array of macrocells;
• a plurality of routing resources that programmably couple said macrocells and said input/output cells;
• and
• a plurality of configurable computational units embedded within said programmable logic device and programmably coupled to said routing resources, wherein said configurable computational units are restricted from use when said programmable logic device is a virtual device.