tag: instruction set architecture

RISC-V Micro-Architectural Verification
By Brian Bailey - 21 Dec, 2023 - Comments: 3

RISC-V processors are garnering a lot of attention due to their flexibility and extensibility, but without an efficient and effective verification strategy, buggy implementations may lead to industry problems. Prior to RISC-V, processor verification almost became a lost art for most semiconductor companies. Expertise was condensed into the few commercial companies that provided processors or... » read more

Coding And Debugging RISC-V
By Ann Mutschler - 06 Nov, 2023 - Comments: 0

As monolithic device scaling continues to wind down and evolve toward increasingly heterogeneous designs, it has created an inflection point for chip architects to create customized cores that are much more energy efficient and faster than off-the-shelf processors. Zdeněk Přikryl, CTO of Codasip, talks about where RISC-V fits into this picture, using a modular ISA and custom instruction layer... » read more

Modeling and Testing Microarchitectural Leakage of CPU Exceptions (Microsoft, Vrije Universiteit Amsterdam)
By Technical Paper Link - 22 Aug, 2023 - Comments: 0

A new technical paper titled "Speculation at Fault: Modeling and Testing Microarchitectural Leakage of CPU Exceptions" was published by researchers at Microsoft and Vrije Universiteit Amsterdam. This paper was included at the recent 32nd USENIX Security Symposium. Abstract: "Microarchitectural leakage models provide effective tools to prevent vulnerabilities such as Spectre and Meltdown vi... » read more

Customizing Processors
By Brian Bailey - 28 Jul, 2022 - Comments: 1

The design, verification, and implementation of a processor is the core competence of some companies, but others just want to whip up a small processor as quickly and cheaply as possible. What tools and options exist? Processors range from very small, simple cores that are deeply embedded into products to those operating at the highest possible clock speeds and throughputs in data centers. I... » read more

ISA Extension For Low-Precision NN Training On RISC-V Cores
By Technical Paper Link - 08 Jul, 2022 - Comments: 0

New technical paper titled "MiniFloat-NN and ExSdotp: An ISA Extension and a Modular Open Hardware Unit for Low-Precision Training on RISC-V cores" from researchers at IIS, ETH Zurich; DEI, University of Bologna; and Axelera AI. Abstract "Low-precision formats have recently driven major breakthroughs in neural network (NN) training and inference by reducing the memory footprint of the N... » read more

Why RISC-V Is Succeeding
By Brian Bailey - 24 Feb, 2022 - Comments: 5

There is no disputing the excitement surround the introduction of the RISC-V processor architecture. Yet while many have called it a harbinger of a much broader open-source hardware movement, the reasons behind its success are not obvious, and the implications for an expansion of more open-source cores is far from certain. “The adoption of RISC-V as the preferred architecture for many sili... » read more

Sweeping Changes Ahead For Systems Design
By Ann Mutschler - 29 Jul, 2021 - Comments: 0

Data centers are undergoing a fundamental change, shifting from standard processing models to more data-centric approaches based upon customized hardware, less movement of data, and more pooling of resources. Driven by a flood of web searches, Bitcoin mining, video streaming, data centers are in a race to provide the most efficient and fastest processing possible. But because there are so ma... » read more

RISC-V Targets Data Centers
By Ann Mutschler - 22 Apr, 2021 - Comments: 0

RISC-V vendors are beginning to aim much higher in the compute hierarchy, targeting data centers and supercomputers rather than just simple embedded applications on the edge. In the past, this would have been nearly impossible for a new instruction set architecture. But a growing focus on heterogeneous chip integration, combined with the reduced benefits of scaling and increasing demand for ... » read more

ISA Ownership Matters: A Tale of Three ISAs
By Roddy Urquhart - 28 Jan, 2021 - Comments: 0

An instruction set architecture (ISA) is crucial to the development of processors and their software ecosystems. In the last half century, the majority of ISAs have been owned by single companies, whether product companies for their own chips/systems or processor IP companies who licensed their processors to chip developers. Does ISA ownership matter? Let’s consider three proprietary ISAs a... » read more

Slower Metal Bogs Down SoC Performance
By Bryon Moyer - 15 Oct, 2020 - Comments: 0

Metal interconnect delays are rising, offsetting some of the gains from faster transistors at each successive process node. Older architectures were born in a time when compute time was the limiter. But with interconnects increasingly viewed as the limiter on advanced nodes, there’s an opportunity to rethink how we build systems-on-chips (SoCs). ”Interconnect delay is a fundamental tr... » read more

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