32-bit Multiprocessor with Level-2 Cache-Coherence

AndesCore™ A25MP 32-bit multicore CPU IP is based on AndeStar™ V5 architecture. It supports RISC-V standard ‘IMAC-FD’ extensions, Andes contributed DSP/SIMD 'P' extension (draft), user-level interrupt 'N' extension, and Andes performance/functionality enhancements such as instructions for faster memory accesses, faster branch handling, and Andes Custom Extension™ (ACE) to add user defined instructions. It features MMU for Linux based applications, branch prediction for efficient branch execution, level-1 instruction/data caches and local memories for low-latency accesses.

The A25MP symmetric multiprocessor supports up to 4 cores and a level-2 cache controller with instruction and data prefetch. Andes Coherence Unit (ACU) manages level-1 cache coherence including I/O coherence for cacheless bus masters, and duplicated L1 tag to screen allocated lines for snoop queries. Other A25MP features include ECC for level-1/2 memory soft error protection, Platform-Level Interrupt Controller (PLIC) with enhancements for vectored dispatch and priority-based preemption, CoDense™, StackSafe™ for software quality improvement, and QuickNap™, PowerBrake, and WFI for power management.

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