Electronic circuit with array of programmable logic cells

Abstract

An electronic circuit has a programmable logic cell with a plurality of programmable logic units that are capable of being configured to operate in a multi-bit operand mode and a multiplexing mode. The programmable logic units are coupled in parallel between an input circuit and an output circuit. In a multi-bit operand processing mode the input circuit is configured to supply logic input signals from different ones of the logic inputs to the programmable logic units. The programmable logic units are coupled to successive positions along a carry chain at least in the multi-bit operand mode, so as to process carry signals from the carry chain. An output circuit passes outputs from the programmable logic units in parallel in the multi-bit operand mode. The programmable logic units have look-up tables which share the same configuration bits. The programmable logic units can also have multiplexers for passing one of the received input signals when configured to operate in a multiplexing mode of operation.

Description

technical field [0001] The present invention relates to an electronic circuit having an array of programmable logic cells. Background technique [0002] Programmable logic cells enable circuit designers to adapt the logic functions of individual instances of mass-produced electronic circuits, such as integrated circuits. This reduces the time interval from design to production of a working circuit, and it reduces manufacturing costs for low-volume production and for prototypes. [0003] In an example of an implementation, a programmable unit contains a memory, which is addressed by an input signal to the unit, which stores a pre-programmed output signal for each combination of input signal values ​​at the respective addresses determined by these addressable by value. This memory is assigned a LUT (Look Up Table) function for looking up output signals that are generated in response to different input signals. [0004] Any logic function can be implemented through a LUT if ...

AI Technical Summary

Problems solved by technology

[0007] However, signal processing implementations that function in this more general purpose circuit that can also implement random logic functions are still far from efficient compared to complex signal processing circuits

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