32 bit RISC-V Multicore Processor with 256-bit VLEN and AMM

Overview

AndesCore™ A46MP(V) 32-bit multicore CPU IP is an 8-stage superscalar processor with Vector Processing Unit (VPU) based on AndeStar™ V5 architecture and Andes Matrix Multiply (AMM) extension. It supports RISC-V standard “G (IMA-FD)”, “ZC” compression, “B” bit manipulation, DSP/SIMD ‘P’ (draft), “V” (vector), CMO (cache management) extensions, Andes performance enhancements, plus Andes Custom Extension™ (ACE) for user-defined instructions. It supports all RVA22 profile mandatory ISAs relevant for RV32. It features MMU for Linux based applications, dynamic branch prediction for efficient branch execution, dual-issue of common instruction pairs, level-1 private instruction/data caches, private level-2 cache and local memories for low-latency accesses. The A46MP(V) symmetric multiprocessor supports up to 16 cores and a shared level-3 cache controller. Coherence Manger ensures data coherence among CPU accesses and IO transactions from external bus managers. All caches are non-blocking with prefetch support. The A46MPV have a powerful VPU with up to 256b VLEN and Matrix unit, is excellent for computations involving large arrays of data.

Key Features and Performance

AndeStar™ V5 Architecture

Key Features	Benefits
RISC-V RV32 GCBPV+CMO Support all RVA22 mandatory features relevant for RV32	State-of-the art ISA from latest developments in computer architecture Industry standard and open architecture
Andes Extended Instructions	Andes exclusive performance and functionality enhancements
MMU and Sv32 virtual memory translation	For Linux and advanced operating systems with protection between kernel and user program
32-Bit CPU architecture	High performance vector core with small code size and gate count
Machine (M), User (U) and Supervisor (S) Privilege levels	Full privilege protections

CPU Core

Key Features	Benefits
>6.3 CoreMark/MHz, >3.9 DMIPS/MHz, >4.3 SpecInt2006/Ghz	Superior performance-per-MHz
8-stage in-order superscalar pipeline	Superior performance-efficiency, while allowing for high speeds
Extensive branch predication features Branch Target Buffer (BTB) Branch Histroy Table (BHT) Return Address Stack (RAS)	Branch Target Buffer and Branch History Table to speed up control codes Return Address Stack to speeds up procedure returns
MMU (Memory Management Unit) Sv32 virtual-memory systems 4/8-entry fully associative ITLB/DTLB 32-512 entry 4-way set-associative shared TLB Hardware page table walker	Virtual memory support for full address space and easy code/data sharing Support for full-featured OS such as Linux Protection of supervisor and user privilege Hardware for fast address translation
Physical Memory Protection (PMP), configurable up to 32 regions	Basic read/write/execute memory protection with minimum cost
Programmable Physical Memory Attribute (PMA), configurable up to 16 regions	Configurable memory attributes: Memory, I/O, None Cacheable/Non-cacheable Read/write/read & write allocate, no allocate Access fault for non-existent regions
Performance monitors	Program code performance tuning
StackSafe™ hardware stack protection	Easy identification of stack size threshold during development Hardware error detection of stack overflow and underflow at runtime
PowerBrake technology	Performance throttling to digitally reduce power consumption

* DMIPS/MHZ follow Dhrystone’s no-inline ground rules, best performances

Memory Subsystems

Key Features	Benefits
Level-1 I-Cache & D-Cache Size: 16KB to 64KB Cache line size: 64 bytes Set associativity: 4-way Level-2 Private Unified Cache Configurable from 64KB to 512KB 64-byte cache line size 8-way, pseudo random replacement Level-3 Shared Cache Configurable from 256KB to 32MB 64-byte cache line size 16-way, pseudo random replacement	Accelerating accesses to slow memories Flexible cache configurations Accelerate performance with larger private 2nd level cache Large shared L3 cache
ILM & DLM Size: 4KB to 16MB Scalar core access only SRAM interface support Bus managers accessed by AXI subordinate port	For deterministic and efficient program execution Flexible size selection to fit diversified needs
HVM Size: 32KB to 4GB Accessible by both VPU and scalar core Fast vector access with DLEN data width Subordinate port for external DMA When MMU is configured, HVM is addressed by translated physical memory, therefore it can also work with virtual memory under Linu	Local memory for vector data, especially for AI model, can work with external DMA to hide the latency High speed direct access Sharable by up to 16 cores with multiple banks design
Optional ECC error protection with SRAM interface	Code and data integrity protection
Bus Manager port: AXI with 128/256-bit data, I/D joint or separate bus	High throughput with wide data path
BUS Subordinate Port: AXI with 128/256-bit data, for ILM/DLM accesses	Efficient data transfer between CPU and SoC masters
Core/bus clock ratio of N:1	Simplified SoC integration

Multicore Cache Coherence

Key Features	Benefits
Support up to 16 cores MESI cache coherence protocol 128/256-bit I/O coherence port for cacheless bus managers	Symmetric multicore and shared L3 cache controller with cache coherence, and I/O coherence for bus managers without caches Convenient and efficient interface for SoCs with rich I/O transactions

Vector Processing Unit (VPU)

Key Features	Benefits
RISC-V V-extension (RVV) 1.0 spec Custom RVV instructions based on ACE-RVV LMUL supporting 1, 2, 4, 8, 1/2, 1/4, 1/8 BF16 data type support for all floating point computations	 Standard and Custom RISC-V vector support
Vector dual issue Available 2nd multiply-add unit	Two vector instructions can be issued at same cycle up to 2 MAC units for maximum performance
Configurable VLEN/DLEN from 128/256 bits with 1:1 or 2:1 ratio Multiple independent vector execution units for parallel execution Dual Independent memory access paths with dual RVV load/store and Andes Streaming Port (ASP) load/store	Addressing a wide range of compute requirements with different area/performance trade-off High Speed memory accesses to CoProcessor memory in addition to the standard memory hierarchy with DLEN data width

Andes Matrix Multiply Extension (AMM)

Key Features	Benefits
2D load/store Upto 16*16 Matrix Multiply INT8 data type	Accelerate AI computation

Platform-Level Interrupt Controller (PLIC)

Key Features

Benefits

Implements RISC-V PLIC specification

Up to 1023 interrupt sources
Up to 255 interrupt priority levels

Interrupt handling for SoC with multiple processors

Enhanced interrupt features

Priority-based preemption
Selectable edge trigger or level trigger

Complete hardware preemption support

Debug Support

Key Features	Benefits
Implements RISC-V debug specifications ver 1.0	Supported by industry debug tool suppliers
JTAG Debug Port	Industry-standard support
Embedded Debug Module with up to 8 triggers	Flexible configurations to tradeoff between gate count and debugging capabilities
Exception redirection support	Entering debugger upon selected exceptions without using breakpoints
RISC-V Trace 1.0 Instruction Trace interface	Supported by Andes tools

Key Features

2 different packages with or without vector: A46MPV, A46MP
in-order dual-issue 8-stage CPU core with up to 256-bit VLEN
Symmetric multiprocessing up to 16 cores
Private Level-2 cache
Shared L3 cache and coherence support
Dual scalar and vector load/store unit
Enhanced sharable High bandwidth vector local memory (HVM)
AndeStar™ V5 Instruction Set Architecture (ISA)
- Compliant to RISC-V RV32 GCBPV + CMO extensions
- Andes performance extension
- Andes CoDense™ extension for further compaction of code size
- support RVA22 mandatory features relevant for RV32 processors
Separately licensable Andes Custom Extension™ (ACE) for customized scalar and vector instruction
Branch predication to speed up control code
Linux-capable Memory Management Unit (MMU)
Physical Memory Protection (PMP) and programmable Physical Memory Attribute (PPMA)
Andes-enhanced Platform-Level Interrupt Controller (PLIC) for a wide range of system events and real-time performance
Multiprocessing up to 16 cores with hardware managed data coherence
Configurable VPU vector length (VLEN) and datapath length (DLEN)
BF16 full arithmetic mode for scalar and vector
Andes Matrix Multiply Extension for fast matrix multiply computation
Platform-Level Interrupt Controller (PLIC) support with easy arrangement of preemptive interrupts
ECC or Parity for SRAM error protection
StackSafe™ hardware to help measuring stack size, and detecting runtime overflow/underflow
Versatile configurations to tradeoff between core size and performance requirements
PowerBrake and WFI (Wait For Interrupt) for different power saving occasions

Block Diagram

Applications

Computer Vision and Image Processing
Digital Signal Processing
Machine/Deep Learning Acceleration
Real-time Control
Networking

Technical Specifications

Short description

32 bit RISC-V Multicore Processor with 256-bit VLEN and AMM

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32 bit RISC-V Multicore Processor with 256-bit VLEN and AMM

Overview

Key Features

Block Diagram

Applications

Technical Specifications

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