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Archive for December, 2015

Verifying Large FPGAs Isn’t Easy

Tuesday, December 15th, 2015

FPGA designers using VHDL have three choices: Stick with VHDL, switch to SystemVerilog, or.. use the best of both. This guest blog from Doug Perry, Senior Member Technical Staff at Doulos, outlines the pros and cons of each.

The latest crop of FPGA devices are enormous when compared to ASICs that were built not that long ago. Verifying these ASICs required detailed plans, multiple tools, and sometimes special languages. Verification was key because the cost of a respin was prohibitive.  FPGA designers using VHDL have three choices: Stick with VHDL, switch to SystemVerilog, or.. use the best of both. This guest blog from Doug Perry, Senior Member Technical Staff at Doulos, outlines the pros and cons of each.

The same is not necessarily true of FPGAs because they can simply be re-programmed when an error is found. However the cost of finding the error in the lab can still be very expensive. This is related to the fact that the number of LUTs available in the device has skyrocketed, but the number of IO pins has not. Therefore getting visibility into the inner workings of the device from outside becomes much more difficult. Finding the source of an error therefore also becomes increasingly difficult. To counteract this problem, designers need to find errors before the device gets into the lab. To do this they need to adopt ASIC-like verification methodologies.

U.V.M. Spells Relief

Friday, December 4th, 2015

blog_120215Verification can be a challenging endeavor. As designs grow in size and complexity, engineers are having difficulty confirming their designs behave properly. This is where UVM may provide some relief. UVM aims to deliver an easier and more flexible way of creating robust test environments so that you can verify those difficult designs effortlessly.

 

So what is UVM?

UVM stands for universal verification methodology and is based on an earlier verification methodology (OVM 2.1.1 developed by Cadence and Mentor Graphics). Accellera used this OVM base, continued development, and now maintains it as a more modern and updated version in UVM. Tangibly, UVM is a library of SystemVerilog code that is intended to help engineers write effective test and verification environments. You can download the UVM class library code, user guide, and reference documents from Accellera’s website.

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