Configurable Logic in Microcontrollers Revolutionizes Small Applications
●Introduction
■Microcontrollers (MCU) are becoming even more flexible as suppliers integrate more external components on-chip. For engineers, this means a new arsenal of tools and possibilities for embedded development. Configurable logic (CL) hardware is one of these relatively new add-ons to the microcontroller market.
■The CL hardware implements combinatorial logic like the basic Boolean AND, OR, or XOR functions, as well as sequential logic like latches. This flexibility allows embedded programmers to easily add their own, custom functionality. From simple signal inverters to more complex Manchester decoders, the configurable logic can operate completely independently from the processor core (CPU). The configurable logic hardware is typically programmed in C and initializes a set of dedicated registers. With C as the programming language, embedded designers will not need to learn another programming language such as VHDL.
■Microcontrollers with configurable logic help reduce BOM costs and minimize board size by integrating off-chip glue logic. CPU resources are freed because configurable logic operates independently from the core. In addition, the capabilities of other peripherals are extended when they are connected to configurable logic. With all this flexibility, small, power-efficient MCUs can be used in applications previously exclusive to larger, flly configurable devices like FPGAs or expensive ASICs.
■To understand the capabilities of the highly flexible features of configurable logic, this paper will explore the general operation of CL hardware on currently available microcontrollers, as well as how configurable logic drives smaller and cheaper applications.
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2017/07/27 |
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348 KB |
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