I’ve run SPICE circuit simulators since the 1970’s and they use transistor models where the device parameters are provided by the foundry. These transistor and interconnect parameters come from an engineer at the foundry who has characterized silicon with actual measurements or by running a TCAD (Technology CAD)… Read More
I have written this before, but I was a ModelSim snob. That has changed after trying Active-HDL from Aldec. I have no plans on going back to ModelSim. You ask why? Well astute reader, great question. Unfortunately these blogs are text limited and there is no way to write about all the bells and whistles of Active-HDL. So before I continue,… Read More
Traditionally logic devices built on top of thin-film-transistors (TFTs) have used one type of device, either an NMOS a-Si: TFT (hydrogenated amorphous silicon) or a PMOS organic device. Recently a-Si:H and pentacene PMOS TFTs have been integrated into complementary logic structures similar to CMOS. This, in turn, creates… Read More
Digital hardware has a habit of deciding – based on the bias and behavior of transistors – to drive outputs to a 0, or a 1, or if commanded a high-impedance Z state. SystemVerilog recognizes a fourth state: X, the “unknown” state a simulator has trouble inferring.
Simulators have a choice. Under X-optimism, they can convert the unknown… Read More
Speaking from experience, it is very difficult to get an OEM customer to talk about how they actually use standards and vendor products. A new white paper co-authored by Broadcom lends insight into how a variety of technologies combine in a flow from IP block simulation verification with assertions to complete SoC emulation with… Read More
In one of my favorite movies, Brad Pitt utters the only question that matters in baseball or technology management in the face of uncertainty: “Okay, good. What’s the problem?” Not surprisingly in that scene, as the question circles the table of experts used to doing things the old way, not a single one can answer it correctly in the… Read More
EDA tool development is always pushing the boundaries, driven in part by bigger, faster chips and more complex IP. For several years now, the trend has been developing tools that spot problems faster without waiting for the “big bang” synthesis result that takes hours and hours. Vendors, with help from customers, are tuning tools… Read More
The Cadence-BDA saga continues with Berkeley Design Automation today filing a motion to dismiss. You can read the full motion HERE. My previous blog “Cadence Sues Berkeley Design Automation” with 30+ comments is HERE.
The first problem BDA brings up is that the DMCA claim by Cadence is so vague that it doesn’t… Read More
Unless you are a small company with one design team, the chance you have standardized on one FPGA vendor for all your needs, forever and ever, is unlikely. No doubt you probably have a favorite, because of the specific class of part you use most often or the tool you are most familiar with, but I’d bet you use more than one FPGA vendor routinely.… Read More
In Mike Muller’s keynote at DAC he wanted to make formal approaches an integral part of writing RTL. After all, formal captures design intent and then, at least much of the time, can verify whether the RTL written actually matches that intent. Today, formal is not used that way and is typically something served “on the side” by specialist… Read More
