FPGA Design

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Design

We have experience in designing digital systems from the IP block level through to full multi-device architectures. We have worked with a wide range of FPGA products from small Spartan family chips through to large Stratix and Virtex devices. We also have experience with programmable SoC (System on Chip) families such as Xilinx's Zynq, where our combined software and hardware skills have allowed us to efficiently create high performance bespoke solutions.

Verification

Thorough verification is important in all designs, as identifying and correcting bugs as early as possible lowers their impact, reducing the time spent in lab testing and hardware debug. Different designs lend themselves to different forms of verification and we are able to select and deploy appropriate tools and techniques, such as assertion based verification, functional verification and reference model comparison, to suit the project requirements.

Behavioural Modelling

For effective verification, high quality behavioural models are essential. They allow designs to be tested against everything they interface with, from communications links to analogue components.

The following are examples of some of the behavioural models that we have delivered:

  • Efficient event-driven models of complex analogue control systems for digital simulations
  • Memory-efficient RAM models optimised for specific applications
  • Behavioural models of larger IP blocks to allow efficient device and system-level simulations

Automated Testbenches

In order to ensure high-quality designs, test automation is essential. Our approach to verification starts from the bottom up, with thorough testbenches covering all significant sub-blocks and achieving test coverage that just isn't possible with higher level simulations. Not only does this ensure quality, but having a testbench for each block improves reusability and can greatly reduce time spent debugging.

Higher-level and top-level testbenches are also vital for verifying the interfaces, both within the device, and also to the outside world. These testbenches also allow the higher-level functionality of the design to be tested and can confirm that the implemented behaviour matches that of previous system models and specifications. To manage complexity, we not only put intelligence into our testbenches, but also into the scripts that call them. This allows us to do such things as precondition simulations to avoid repeating the simulation of start-up behaviour that is not effected by stimulus differences and significantly reduce verification time.

An accurate software model of the system can also be a huge asset in some cases. Not only does this allow algorithms to be proven and refined before the hardware is developed, but also provides a ready source of test vectors to control and verify the hardware design. Our designers are experienced at creating this style of testbench and, because we also have a software team in-house, we are also able to develop the software models.

Gate-Level and Back Annotated Simulation

Gate-level simulation allows us to identify mismatches in the behaviour of RTL code (pre-synthesis) and gate-level netlists (post-synthesis). Back annotation involves taking predicted timing values after synthesis or place and route for each cell in the design and applying them to a gate-level simulation. Running simulations with accurate timing information gives the most realistic digital simulations possible and provides a final check that the design was correctly constrained during synthesis. They can also identify problems such as interface timing issues when used in conjunction with timing-accurate behavioural models.

System Simulation

ITDev has experience in the simulation of complete systems. This may include using behavioural models for non-FPGA devices (e.g. RAMs) and allows inter FPGA communication and complex system verification even with multiple FPGA vendors. Using system simulations we are able to thoroughly test device and user interfaces not normally covered by simulation.

Synthesis

Getting synthesis right and checking its results is crucial to achieving a product that is right first time and operates reliably over process, voltage and temperature variations. We always script our synthesis flows in order to ensure quality and repeatability. We adopt techniques to vastly improve detection of problems such as unhandled clock boundaries, which are one of the most common causes of failure not covered by simulation.

To ensure that no important warnings slip through the net when reviewing the synthesis reports and transcripts, we employ an in-house software tool. This tool not only makes the task easier and faster, but also generates documentation to describe why any warnings in the transcript are acceptable.

Latest Blog Posts

Posted 27th November 2018, By James H
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ITDev internship image
Posted 14th November 2018, By Orianne T
As a company, ITDev invests in the future of engineering by offering summer internships to undergraduates. Matthew wanted to share some advice to other ...more
Posted 27th October 2018, By Hugh J
If you’ve worked on projects where a full UVM test bench was used you’ll probably have appreciated the benefits it gives you. Unfortunately, sometimes it is ...more
Partial team photo summer 2018
Posted 7th September 2018, By Jon O
Claudine was one of our interns this summer. Having had an enjoyable experience she captured a summary of her time at ITDev and agreed we could share it. Here' ...more

Latest News

TechWorks Awards Gala and Dinner November 2018
Posted 29th November 2018
As founding members of TechWorks, ITDev was delighted to attend the TechWorks Annual Industry Summit and Awards Dinner in November. The Industry Summit was an ...more
Posted 9th November 2018
On Wednesday 7th November, ITDev invited 15 STEM students from the University of Southampton to take part in a ‘Getting to know you’ event. The company ...more
IBC 2017 Registration queue
Posted 10th September 2018
The Broadcast and Pro-AV industries are key markets for us and some of our clients. In recognition of this we plan attendance at key industry events like ISE ( ...more
Welcome meal photo
Posted 7th August 2018
As mentioned in our last news item, we have 3 summer interns working with us for 10 weeks over the summer. We combined a celebration of their joining the team ...more