Logic modules for semiconductor integrated circuits

Abstract

The present invention provides a logic module (400) that is capable of implementing data-path and random logic (command Z in bloc 42) uses control logic for selectively coupling one or more of the input terminals (10, 12, 14, 16, 18, 40) to the at least one output terminal (20) . The control logic comprises a plurality of logic elements (26, 28, 30, 32) arranged to generate a first set of two-input logic functions (f , (a, b)) and a programmable inverter (36) arranged to generate a second set of two-input logic functions, the second set of two-input logic functions being the complement functions of the first set of two-input logic functions. SRAM memory cells (4 bit memory batch (38)) may be used for configuration purposes, realising a compact logic module or block that is also re-programmable .

Description

technical field [0001] The present invention relates to logic modules for semiconductor integrated circuits, and in particular to multiplexer-based logic modules used in programmable hardware such as Field Programmable Gate Arrays (FPGAs). Background technique [0002] Various types of programmable hardware solutions exist in the market today. The different types are broadly categorized as: Programmable Array Logic (PAL), consisting of a programmable AND plane followed by a fixed OR plane; Field Programmable Gate Array (FPGA), whose main The main switch technology is SRAM and anti-fuse; and complex programmable logic device (CPLD), its main switch technology is like in Erasable Programmable Read-Only Memory (EPROM) and Electrically Erasable Programmable Read-Only Memory (EPROM) Floating gate transistors like those used in EEPROM) devices. [0003] SRAM-based programmable schemes are in-circuit programmable (unlike EPROM, which is reprogrammable out-of-circuit), and thus ar...

AI Technical Summary

Problems solved by technology

The disadvantage of these solutions is that they are only one-time programmable as a result of using antifuse

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