How Cache Coherency Impacts Power, Performance


As discussed in part one, one of the reasons cache coherency is becoming more important is the shared common memory resource in designs today. Various agents in the design want to access the data the fastest they can, putting pressure on the CPU complex to manage all of the requests. Until a generation ago, it was okay for the CPU to control that memory and have access to it, as well as be t... » read more

Executive Insight: K. Charles Janac


K. Charles Janac, chairman and CEO of Arteris, sat down with Semiconductor Engineering to talk about what's changing in the automotive market, the impact of big data, and heterogeneous cache coherency. What follows are excerpts of that discussion. SE: What are the big changes you're seeing in semiconductor design? Janac: There are a lot of changes right now. Mobility is slowing down and b... » read more

Coherency, Cache And Configurability


Coherency is gaining traction across a wide spectrum of applications as systems vendors begin leveraging heterogeneous computing to improve performance, minimize power, and simplify software development. Coherency is not a new concept, but making it easier to apply has always been a challenge. This is why it has largely been relegated to CPUs with identical processor cores. But the approach ... » read more

What Is Coherency?


Coherency is about ensuring all processors, or bus masters in the system see the same view of memory. Cache coherency means that all components have the same view of shared data. Just as you need both of your eyes to have the same view in order to see properly, it’s critical for every IP block that has access to a shared data source to view consistent data. For example, if I have a process... » read more

Blog Review: Dec. 31


Mentor's J. VanDomelen zeroes in on the two most interesting discoveries from the Philae comet landing. So what was that "eerie cyclical clicking" sound? Synopsys' Ray Varghese digs into basic coherent transaction testing for AXI/ACE compliant interconnects. You might want to put on another pot of coffee. Cadence's Brian Fuller offers some deep insights into synthesis, verification and te... » read more

Executive Insight: Simon Segars


SE: What concerns you most? Segars: In the context of design and where chip design is going, ARM is a long-term business. We’re doing stuff now that is going to ship in five years’ time. Obviously, for everyone in this space, Moore’s Law has been a fantastic thing. It’s enabled us to achieve really fantastic scaling of transistors, and everyone knows that is getting harder and harder... » read more

The Evolving Interconnect


By Ann Steffora Mutschler Chip interconnect protocol requirements are evolving as designs move to 20nm and below process geometries, and not always in predictable ways. At least part of this is being driven by what an SoC is used for. The continued push to shrink features opens up real estate at each new process node. For the past decade, that real estate has been used to add more featu... » read more