¶ CPU IP
¶ Dubhe-80
¶ Overview
StarFive Dubhe-80 processor features a 9+ stage, 3-issue, out-of-order pipeline, fully compliant with RV64GCBVH specifications. With a score of 8.0 SPECInt2006/GHz, Dubhe-80 is designed for mobile, desktop, AI, and automotive applications that require highly energy-efficient computation.
Dubhe-80 has been pre-integrated and verified, making it easy to use for SoC development work. With options of single-core, dual-core, or quad-core in a single cluster with memory coherency, Dubhe-80 is highly scalable.
¶ Block Diagram
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¶ Dubhe-90
¶ Overview
StarFive Dubhe-90 processor features an 11+ stage and 5-issue pipeline, superscalar, and deep out-of-order execution, and supports standard RISC-V RV64GCBH extensions. With a score of 9.4 SPECInt2006/GHz, Dubhe-90 is designed for high-performance computing scenarios and devices, such as data centers, PCs, mobile devices, high-performance network communications, and machine learning.
Dubhe-90 has been pre-integrated and verified, making it easy to use for SoC development work. With options of single-core, dual-core, or quad-core in a single cluster with memory coherency, Dubhe-90 is highly scalable.
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¶ Interconnect Fabric IP
¶ StarLink-500
¶ Overview
StarLink-500 is StarFive's first self-developed interconnect fabric IP with cache coherence support, supporting the construction of multi-cores and SoC to provide cache coherence NoC, connecting multiple CPU clusters, IO devices, and DDR, and maintaining cache coherence within the SoC.
- Providing NoC with cache coherence: connecting multiple CPU clusters, IO devices, and DDR, and maintaining cache coherence within the SoC.
- High Performance: Provides Last Level Cache (LLC), offers Snoop Filter, improves the efficiency of coherence maintenance modules, and memory hierarchy performance.
- Efficient Data Exchange: Supports CPU and IO device sharing of LLC, simplifying CPU and IO data exchange and improving performance.
- Low Power Consumption: Supports LLC way shutdown, cache retention, and other low-power technologies.
- High Reliability: Snoop Filter and LLC support SEC-DED (Single Error Correction Double Error Detection).
- Control Interface Support (CFG & MMIO): CPU configuration of IO devices and on-chip SRAM reading; IO device access and configuration of on-chip interconnect coherence.
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¶ StarLink-700
¶ Overview
StarLink-700 is StarFive's self-developed high-scalable, high-performance interconnect fabric IP supporting cache coherence, enabling the construction of a manycore SoC solution.
- Providing NoC with cache coherence: connecting up to 256 CPU cores, IO devices, and DDR, while maintaining cache coherence within the SoC scope
- High performance: providing a maximum of 512 MB Last Level Cache (LLC) with Snoop Filter, enhancing the efficiency of coherence maintenance modules and memory hierarchy performance.
- High scalability: employing mesh NoC to enhance expandability, and a dedicated control NoC to support control command transmission
- Low latency: adopting a semi-custom design approach to reduce NoC transmission latency.
- Efficient data exchange: supporting CPU and IO devices to share the LLC, simplifying CPU and IO data exchange, and improving performance
- Low power consumption: supporting low power consumption technologies such as LLC way shutdown and Architecture Clock Gating
- High reliability: Snoop Filter and LLC support ECC (SEC-DED, Single Error Correction Double Error Detection)
¶ Block Diagram
¶ Multi-Core Solution
¶ Overview
StarFive RISC-V Multi-Core Solution is a high-performance, high-bandwidth, low-latency SoC solution based on StarFive RISC-V CPU IP and Interconnect Fabric IP. This solution provides:
- RISC-V high performance core--Dubhe-90
- RISC-V high efficiency core--Dubhe-80
- High-speed Interconnect Fabric IP supporting cache coherency--StarLink-500
- RISC-V debug module
- RISC-V PLIC and CLINT
- Power management, security, virtualization (CPU), IO coherency, and memory subsystem.
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¶ Manycore Solution
A high-performance, high-bandwidth, low-latency RISC-V manycore SoC solution based on StarFive RISC-V CPU IPs and Interconnect Fabric IP. This solution provides:
- RISC-V high performance core--Dubhe-90
- High-speed interconnect fabric IP supporting cache coherence--StarLink-700
- RISC-V debug module interface
- RISC-V PLIC and CLINT
- Power management, security, virtualization, IO coherency, and memory subsystem.
