The price of time-sharing and multiplexing
The familiar question, “How much did you have to put down on that time-share?” will soon be expanding from condominium real estate to advanced chip design. Tabula’s introduction of the provocatively named “Spacetime” earlier this week generated a lot of discussion on a characteristic seen in a few new FPGA architectures (3D interconnect) and one that is rather unique (time-slicing and multiplexing on-chip, between logic elements, to achieve greater density).
My colleague Ron Wilson provided perhaps the least starry-eyed analysis of any coverage this week, though the San Jose Mercury News should be credited for referring to Chris Edwards’ warning that there is no guarantee most designers will be willing to pay for these innovations.
Here’s where my skepticism comes in: I am happy to see at least four or five new startups in the FPGA realm, arising during a recession, though there is no indication they can crack the Xilinx-Altera duopoly any better than the startups of 2001-03. Some startups, such as SiliconBlue, NuPGA, and TierLogic, are betting on innovations that may be affordable for enough customers to gain the companies a critical mass in revenue stream.
Tabula’s innovations appear to be the most exciting of the bunch. Line multiplexing in and of itself can be a necessity for on-chip buses, channel aggregation in high-speed serial interfaces, and the like, but muxing in the time domain is the same kind of thing that got Inmos and other innovators into trouble on the “bridge too far” front. You certainly gain in logic density, to be sure, but at what cost in unit ASP and up-front design costs?
Craig Matsumoto generated a lot of discussion in his Light Reading analysis about the full associated costs of developing a Spacetime design, and whether those costs outweighed aiming for a generic ASIC. Fair question, and the Tabula founders gained little credibility when they said they were looking for a strict high-end customer base. I could say Jaguar, I could say Hummer, but the point is that in times of deep economic recession, there is little room for a startup which has burned through $100 million in venture cash and wants to focus strictly on the high end.
If the ultimate end game is to hope for a buyout bid from Xilinx or Altera, I have news for Tabula: I saw plenty of network equipment business plans in 1998-99 that ended with “Then we get bought by Cisco.” By 2001, Cisco didn’t have enough money to buy a three-person design house. If the Tabula business plan is hoping for a buyout in an economy like this one, the chances don’t look thrilling. And its methods for generating significant revenue stream from Spacetime don’t look like an adequate Plan B.
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