Output structure with cascaded control signals for logic blocks in integrated circuits, and methods of using the same

An integrated circuit, comprising:

• an interconnect structure;
• a plurality of substantially similar logic circuits arrayed to form a column of the logic circuits, each of the logic circuits having at least one input coupled to the interconnect structure and further having first and second outputs;
• and
• a vertical cascade chain having a plurality of first inputs coupled to the first outputs of the logic circuits, a plurality of second inputs coupled to the second outputs of the logic circuits, and a plurality of outputs coupled to the interconnect structure.

A method of placing data from a plurality of logic circuits onto an interconnect structure in a programmable integrated circuit, the method comprising:

• programming each of the logic circuits to apply the data from the logic circuit to a corresponding data input of a corresponding first output multiplexer;
• programmably coupling an initial select line to a data input of a first select multiplexer in a cascade chain of select multiplexers, each of the select multiplexers driving a select input of an associated first output multiplexer having an output coupled to the interconnect structure;
• programming the first select multiplexer to pass a value on the initial select line to an output of the first select multiplexer;
• and
• programming subsequent select multiplexers in the cascade chain to pass values received from preceding select multiplexers in the cascade chain to the outputs of the subsequent select multiplexers.