Simple Micro APB Bus Controller

CoreABC is a simple, low gate count controller for Advanced Microcontroller Bus Architecture (AMBA®) advanced peripheral bus (APB) based designs. In particular, it is targeted to control CoreAI and CorePWM in mixed-signal applications, but it can be used to control any APB or APB3 bus IP core. CoreABC supports a comprehensive assembler-based configurable instruction set architecture and extensive and flexible configuration of size and feature options allowing it to be tuned to meet the resource constraints and processing power requirements of a wide variety of applications. The instructions executed are either held in a small internal ROM constructed from logic tiles ("hard" configuration), stored in RAM blocks internal to CoreABC ("soft" configuration), or in Fusion or SmartFusion devices, in on-chip nonvolatile memory ("NVM" configuration). The core is easy to configure and program offering efficient local control for use in real-time applications in Microsemi FPGAs.

The core consists of six main blocks:
* Instruction block
* Sequencer
* ALU and flags
* Storage
* ACM
* APB controller
* AMBA3 APB master interface controller

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