Tag Archives: C-to-FPGA

An open letter to DeepChip readers

DeepChip? What’s that?

DeepChip is the website of John Cooley and home of the perennially unofficial and irreverent ESNUG (East Coast Synopsys Users Group). DeepChip has evolved over the years – almost two decades now – into a highly popular site for discussing design methods and tools of all flavors, with a particular focus on ASIC and, to a lesser extent, FPGA hardware design.

In recent weeks and months there have been a flurry of comments on DeepChip from vendors of C-to-FPGA tools, and from users of those tools, culminating with a long-overdue acknowledgement from John that such tools really are gaining traction. See “I Sense A Tremor In The Force”.

I found the dialogue somewhat heartening; it’s good to see the conservative world of ASIC design finally starting to embrace these tools. But I also found the theme of the whole debate – that these tools are new, untested and exotic – a little amusing. And so, during the week of the Design Automation Conference, here is my open letter to the DeepChip community:

Subject: C-to-FPGA Users: Who Are These People?

Here are some perspectives on the recent C-to-hardware debates….

Are there actual users of this stuff? Absolutely. The real question is, who are these people?

C-to-hardware tools are not yet common among traditional hardware designers. Yes, there are successful ASIC tapeouts and some scattered successes in, for example, consumer video processing on FPGAs. We are hearing more of these successes every year. But for the vast majority of hardware designers, RTL methods using VHDL and Verilog are still the preferred route. Particularly in a downturn, what project leader wants to risk their career on a new design method?

The move to higher level methods of design will happen; it’s just a matter of time, and of getting a critical mass of success stories with clearly stated benefits. We’ve seen this before, by the way… VHDL and Verilog did not take over from schematics overnight, and that move was less of a leap of abstraction than the current push from RTL into ESL.

So where is the action in C-to-hardware?

It’s on the software side of the world. It’s in embedded systems for defense and aerospace, it’s in reconfigurable computing research groups. it’s in financial computing and life sciences. It’s in places that do not have significant hardware development expertise. It’s in places where Deepchip.com is not widely read, and where “EDA” and “ESL” have little or no meaning.

I can state emphatically that C-to-FPGA tools really do work. Impulse C, for example, has users worldwide who are applying their C programming skills to create hardware coprocessors for embedded systems-on-FPGA, or to move processing intensive algorithms into dedicated FPGA logic, using the newest FPGA-accelerated computing platforms.

Are these tools perfect? By no means. Any user of Impulse C would report similar frustrations – but also the productivity benefits – that we’ve seen regarding other C-to-hardware tools. All of these tools have their peculiarities, and all require a certain amount of C-language refactoring in order to achieve acceptable performance. All of these tools require “best practices” training. However, I believe all of our tools have now matured to the point where that level of refactoring can be performed by a skilled software programmer, with little or no prior knowledge of RTL.

To summarize… I believe we are nearing a point at which traditional hardware engineers will begin moving en-masse to higher-level tools, including C-to-hardware. There will finally be a payoff for the ESL vendors that have been pushing these technologies forward, and a bigger payoff in productivity for the development teams that take the leap and use ESL for complex systems. But I also believe the bigger, unreported story is that a new generation of FPGA programmers is emerging, blurring the distinction between hardware and software for embedded and high performance computing systems.

David Pellerin, CEO
Impulse Accelerated Technologies

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