Integrated circuits with logic regions having input and output bypass paths for accessing registers

Abstract

The invention relates to integrated circuits with logic regions having input and output bypass paths for accessing registers. Integrated circuits such as programmable integrated circuits may include programmable logic regions that can be configured to perform custom functions. Interconnects may be used to route signals throughout the integrated circuit. The programmable logic regions may have input selection circuitry for selecting and providing input signals from the interconnects to the programmable logic regions. The programmable logic regions may include look-up table circuitry for processing the input signals and registers for storing output signals from the look-up table circuitry. The programmable logic regions may include output selection circuitry for selecting which output signals are provided to output circuitry of the programmable logic regions. The programmable logic regions may include bypass paths that provide direct access to the registers from the interconnects by bypassing the input and output selection circuitry. Computer-aided design tools may be used to identify registers in a design that should be used for register pipelining.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application No. 13 / 555,014, filed July 20, 2012, which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates to integrated circuits, such as programmable integrated circuits with interconnected circuits. Background technique [0004] Programmable integrated circuits are well known. Programmable integrated circuits can be programmed by the user to implement desired custom logic functions. In a typical scenario, logic designers use computer-aided design (CAD) tools to design custom logic circuits. These tools generate configuration data when the design process is complete. Configuration data is loaded into programmable integrated circuit memory elements to configure the device to perform the functions of custom logic circuits. In particular, configuration data configures programmable interconnects, programmable trans...

AI Technical Summary

Problems solved by technology

In this case, it would be very time consuming for the input multiplexer to select signals from a single interconnect for delivery to the registers via the lookup table circuit

The signal a

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